Nickolay A Krotkov

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Nickolay A Krotkov

  • RSCH AST, ATMOSPHERIC CHEMISTRY & DYN
  • 301.614.5553
  • NASA/GSFC
  • Mail Code: 614
  • Greenbelt , MD 20771
  • Employer: NASA
  • Brief Bio

    EDUCATION
    Ph.D., Oceanography, P.P.Shirshov Institute of Oceanology, Russian Academy of Sciences, 1990
    Post-Graduate School, Moscow Institute of Physics and Technology (MIPT) 1987-1990
    M.S., Remote Sensing, Moscow Institute of Physics and Technology (MIPT), 1985
    B.S., Physics, Moscow Institute of Physics and Technology (MIPT), 1983

    FIELDS OF SPECIALIZATION
    Atmospheric chemistry, remote sensing of atmospheric trace gases and aerosols, theory and numerical methods in radiative transfer, retrieval algorithm development of atmospheric composition (aerosols and gases) from space (atmosphere, ocean and volcanic plumes monitoring) and ground air quality research.

    EXPERIENCE SUMMARY

    Dr. Nickolay A. Krotkov has over 30 years experience in radiative transfer, remote sensing observations, retrieval algorithm development, data analysis and research in the field of atmospheric composition (gases and aerosols). His Ph. D work in oceanography included radiative transfer modeling of the polarization effects of the solar radiation in the atmosphere-ocean system, as applied to passive spectral and polarization remote sensing of the atmospheric aerosols and water quality. Since 1993 he works with NASA Goddard Space Flight Center scientists to improve retrievals and understanding of Earth’s gas species such as sulfur dioxide, nitrogen dioxide, ozone and aerosols using remote sensing observations from satellite platforms and ground. His experience in radiative transfer and retrievals has led to algorithms for operational satellite data production. He developed first satellite algorithm for mapping surface UV irradiance from TOMS ozone and reflectivity data, which was adopted by the Finnish Meteorological Institute (FMI) for the Ozone Monitoring Instrument (OMI) production data (2004-current). In 2004 he developed a passive remote sensing method that led to discovery of enhanced column UV aerosol absorption due to organic aerosol. In part through his work absorbing aerosols (e.g., “brown” organic carbon) are now recognized as key to a complete understanding of surface UV radiation and atmospheric photochemistry. He developed a first operational OMI algorithm for retrieving sulfur dioxide from volcanoes and anthropogenic pollution and serves as principle investigator for the OMI volcanic and pollution sulfur dioxide products. Dr. Krotkov’s empirical and theoretical analysis of the sulfur dioxide data has led to quantification of passive emissions from active volcanoes and of anthropogenic pollution sources affecting air quality in North America, Europe, Russia, Chian, and India. Satellite volcanic SO2 data are now used in near real-time for detection of aviation hazards. In 2008 he developed an improved multiangle UV algorithm to derive vertical profile of ozone from ground based Brewer spectrometer data. Since 2010 he serves as PI for the OMI operational NO2 data. He demonstrated the great value that satellite sulfur dioxide and nitrogen dioxide data have in remotely identifying and quantifying point sources of emissions to the atmosphere. He is currently member of NASA Aura. EV-I TEMPO and DSCOVER/EPIC science teams, and disasters response team.

    PRESENT POSITION
    2010- Research Physical Scientist, Atmospheric Chemistry and Dynamics Laboratory, NASA Goddard Space Flight Center

    Dr. Krotkov supervises production and improvements of operational SO2 and NO2 products from EOS Aura/OMI and Suomi NPP/OMPS instruments, performs data analysis of satellite measurements and geophysical research with satellite data, collaborates with NASA Headquarters, universities, other government agencies (USGS, NOAA) and international partners (Environment Canada, ESA, EUMETSAT, FMI, KNMI, BIRA); interprets and quality controls research results; presents findings at national and international meetings; prepares reports, contributes to international assessments and publishes manuscripts in professional journals. He is PI for volcanic SO2 and ash products from NASA’s EPIC UV camera on DSCOVR satellite at Lagrange 1 orbit. He is currently applying his knowledge in retrieval of atmospheric composition for planning of future satellite missions, such as NASA first geostationary air quality TEMPO mission. He retrieves aerosol absorption optical properties using combination of ground based passive radiometers and spectrometers.

    Science Projects

    2016 – PI, NASA ROSES16: “Taking OMI NO2 to the next level: Inferring global fossil fuel CO2 emissions using OMI NO2 Data Improved with Critical Algorithm Updates”
    2016 - Co-I, NASA ROSES16 : “Advancing NASA OMI SO2 product: Enabling new science analyses, applications, and long-term, multi-satellite monitoring”
    2015 – Co-I NASA SIF: “Towards a Database of Volcanic Ash Optical and Chemical Properties to Support Remote Sensing and Modeling for Earth and Planetary Applications”
    2014 – NASA ROSES14 - Participating Investigator in ESA’s Sentinel 5 Precursor mission (TROPOMI)
    2014 – PI, NASA ROSES 14 – DSCOVR science team (EPIC observations of Volcanic SO2 and ash)
    2014 – PI, NASA DISASTERS11stage 2: “Real-time Volcanic Cloud Products for Aviation Alerts”
    2012 – Co-I, NASA EV-I TEMPO ST (NO2, SO2, surface UV algorithms)
    2012 – PI, NASA ROSES2012-MEaSUREs: “Multi-Decadal Sulfur Dioxide Climatology from Satellite Instruments”

    Web pages:

    http://www.researcherid.com/rid/E-1541-2012
    http://so2.gsfc.nasa.gov

    Satellite Instrument team membership

    2015 – ESA S5P (TROPOMI) validation team member
    2014 – NASA DSCOVR (EPIC) science team member
    2012 – NASA EV-I TEMPO science team member
    2011 – NASA GEO-TASO airborne UV/VIS spectrometer science team member
    2011 - NASA GEO-CAPE formulation study science team member
    2001- Aura/OMI science team member and PI responsible for SO2 and NO2 data.
    1995-2006 TOMS ST member, responsible for surface UV algorithm development; volcanic ash and sulfur dioxide data sets.

    Honors Received

    NASA GSFC Performance Awards:2015. 2016

    2013 – NASA EV-I TEMPO science Team award
    2009 – NASA Robert H. Goddard Exceptional Achievement Science awar
    2008 – NASA group achievement award for OMI Instrument team
    2006 – Pecora Award to TOMS team for remote sensing
    2005 – “Aura Project” Group Achievement Award from NASA
    2005 – “Aura Team” Group Achievement Award from the Goddard Space Flight Center
    2002 – “Best paper award” from the International Academic Publishing Company MAIK “Nauka/Interperiodica”, Diploma N46, (Russia)
    1999 – Outstanding Performance in Science Award from the Laboratory for Atmospheres, NASA Goddard Space Flight Center

    Service to community

    2015 – member, scientific committee of ESA’s Living Planet Symposium, Prague 2016
    2014 – Co-Chair AIAA14 meeting on Volcanic Ash effects on Aviation; co-chair CEOS 2014 meeting;
    2011 - Chair, Fall AGU session, Remote sensing of trace gases and aerosols: Air quality applications.
    2005-2008 – UMBC/GEST: Leader: Atmospheric Chemistry focus area. Chair promotional committee.
    2007 – Science organising committee member for International Conference “100 years of UV research”, PMOD, Davos, Switzerland;Contributor/author: Laboratory for Atmospheres annual reports; WMO Ozone assesments;
    Reviewer: JGR, GRL, Atm. Environment, ACP, AMT

    Universities collaborations
    2012 – 2016 adjunct Professor, Physics Departmet, UMBC
    2011 – Eric Hughes, AOSC Univesity of Maryland, College Park; advising Ph. D.
    2010 – Adriana Lima, Physics Department, Univ of Maryland Baltimore County, advising Ph. D.
    2014 - Jungbin Mok, ESSIC, Univesity of Maryland, College Park; advising Ph. D
    2008 – 2010 Can Li, Ph. D. (committee member) Univesity of Maryland, College Park, Department of Atmospheric and Oceanic Sciences;
    2007 - 2008 Brittany McClure, M. S. (committee member) Univesity of Maryland, College Park,

    PRECEDING POSITIONS

    Senior Research Scientist, Goddard Earth Scienes and Technology (GEST) Center ,
    University of Maryland Baltimore County, Oct 2000 – November 2010
    Conducted scientific investigations to improve the understanding of Earth’s troposphere gas species such as sulfur dioxide, ozone and aerosols using remote sensing observations from satellite platforms and ground. His satellite algorithm for mapping surface UV irradiance from TOMS ozone and reflectivity data was adopted by the Finnish Meteorological Institute (FMI) for the Ozone Monitoring Instrument (OMI) production data. He later developed a new algorithm for retrieving sulfur dioxide from volcanoes and anthropogenic pollution, which was adopted as the standard OMI data product. Since 2006 he served as principle investigator for the OMI volcanic and pollution sulfur dioxide products. Dr. Krotkov’s empirical and theoretical analysis of the sulfur dioxide data has led to quantification of passive emissions from active volcanoes and of anthropogenic pollution sources affecting air quality in North America, Europe, Russia, China, and South America. These data are now used in near real-time by NOAA for detection of aviation hazards from volcanic eruption clouds. For this work he was recipient of NASA group achivement awards (2005,2008), 2006 Pecora TOMS team award and the 2009 R.H. Goddard Exceptional Achievement in Science Award. In 2004 he developed a method that led to discovery of enhanced column UV aerosol absorption due to organic aerosol. In part through his work at GSFC absorbing aerosols (black and organic carbon, dust) are now recognized as key to a complete understanding of atmospheric chemistry, for they have large effects on ultraviolet radiation, and on photolysis rates of key pollution gases (ozone and nitrogen dioxide ). In 2008 he developed an improved multiangle ultra-violet algorithm to derive the vertical profile of ozone from ground based Brewer spectrometer data. Supervisor – Prof. Ray Hoff

    Raytheon ITSS Corporation, Lanham, MD, Principal Scientist, July 1996-Oct 2000
    Developed an algorithm for satellite UV volcanic ash retrievals using NASA Total Ozone Mapping Spectrometer (TOMS) instruments. For this work received Outstanding Performance in Science Award from the Laboratory for Atmospheres, NASA Goddard Space Flight Center. Developed applications of TOMS data, such as UV irradiance estimation at the Earth's surface and validated satellite UV retrievals using ground based UV measurements. Authored and co-authored 10 papers. Supervisor- Dr. Charles G. Wellemeyer

    Department of Meteorology, University of Maryland, College Park, MD, Research Associate, Dec 1994 -July 1996 -Developed an improved retrieval algorithm of sulfur dioxide from the NASA TOMS satellite instrument. Performed data analysis of the effect of ozone depletion on ultraviolet (UV) irradiance at the Earth's surface and in the ocean. Performed validation of satellite UV maps with Russian spectral UV radiation data with data from NSF UV Spectroradiometer network in the United States. Authored and co-authored 2 papers. Supervisor- Prof. Robert Hudson.

    Universities Space Research Association at NASA GSFC, Greenbelt, MD, Research Associate and Research Scientist, January 1993 - December 1994 - Analyzed sulfur dioxide data from NASA TOMS instruments. Developed a new computer model simulating propagation of solar UV radiation through the atmosphere-ocean system. Initiated the first intercomparisons of Russian spectral UV radiation data with data from NSF UV Spectroradiometer network in the United States. Supervisor- Dr.Michael W. Kalb

    Central Aerological Observatory, Dolgoprudny, Russia, Research Associate, Sep 1990 – Dec 1992
    Developed radiative transfer models for atmospheric scattering of solar UV radiation. Served as leader of the cooperative project in the framework of Russian State Science Program "Global Changes of Environment and Climate" aimed at the development of scientific approaches to monitoring surface UV radiation changes. Initiated and supervised development of a specialized archiving software package ("UVBase") facilitating analysis and intercomparisons of spectral UV radiation data. Supervisor- Dr. V. Khattatov, CAO Deputy Director

    Moscow Institute of Physics and Technology (MIPT), Dolgoprudny, Russia, GRA, July 1986 – Sep 1990 -Junior Research Fellow (1986-1987) and Graduate Research Assistant (1987-1990) at the Department of Aerophysics and Space Research (Remote Sensing Laboratory). Primary research interests were in theoretical modeling of the polarization effects of the solar radiation in the atmosphere-ocean system, as applied to passive remote sensing of the minor atmospheric gases, aerosols and natural waters. In cooperation with an experimental team, participated in the optical and ecological expeditions in the regions of the Black and Baltic seas. Published 16 papers. Supervisor-Prof. T. V. Kondranin


    PROFESSIONAL MEMBERSHIPS
    American Geophysical Union

    Publications

    Refereed

    Mok, J., N. A. Krotkov, O. Torres, et al. H. Jethva, Z. Li, J. Kim, J.-H. Koo, S. Go, H. Irie, G. Labow, T. F. Eck, B. N. Holben, J. Herman, R. P. Loughman, E. Spinei, S. S. Lee, P. Khatri, and M. Campanelli. 2018. "Comparisons of spectral aerosol single scattering albedo in Seoul, South Korea." Atmospheric Measurement Techniques, 11 (4): 2295-2311 [10.5194/amt-11-2295-2018]

    Levelt, P. F., J. Joiner, J. Tamminen, et al. J. P. Veefkind, P. K. Bhartia, D. C. Stein Zweers, B. N. Duncan, D. G. Streets, H. Eskes, R. van der A, C. McLinden, V. Fioletov, S. Carn, J. de Laat, M. DeLand, S. Marchenko, R. McPeters, J. Ziemke, D. Fu, X. Liu, K. Pickering, A. Apituley, G. González Abad, A. Arola, F. Boersma, C. Chan Miller, K. Chance, M. de Graaf, J. Hakkarainen, S. Hassinen, I. Ialongo, Q. Kleipool, N. Krotkov, C. Li, L. Lamsal, P. Newman, C. Nowlan, R. Suleiman, L. G. Tilstra, O. Torres, and K. Wargan. 2018. "The Ozone Monitoring Instrument: overview of 14 years in space." Atmospheric Chemistry and Physics, 18 (8): 5699-5745 [10.5194/acp-18-5699-2018]

    Vasilkov, A., E.-S. Yang, S. Marchenko, et al. W. Qin, L. Lamsal, J. Joiner, N. Krotkov, D. Haffner, P. K. Bhartia, and R. Spurr. 2018. "A cloud algorithm based on the O2-O2 477 nm absorption band featuring an advanced spectral fitting method and the use of surface geometry-dependent Lambertian-equivalent reflectivity." Atmospheric Measurement Techniques, 11 (7): 4093-4107 [10.5194/amt-11-4093-2018]

    Vasilkov, A., W. Qin, N. Krotkov, et al. L. Lamsal, R. Spurr, D. Haffner, J. Joiner, E.-S. Yang, and S. Marchenko. 2017. "Accounting for the effects of surface BRDF on satellite cloud and trace-gas retrievals: a new approach based on geometry-dependent Lambertian equivalent reflectivity applied to OMI algorithms." Atmospheric Measurement Techniques, 10 (1): 333-349 [10.5194/amt-10-333-2017]

    Li, C., N. A. Krotkov, S. Carn, et al. Y. Zhang, R. J. Spurr, and J. Joiner. 2017. "New-generation NASA Aura Ozone Monitoring Instrument (OMI) volcanic SO2 dataset: algorithm description, initial results, and continuation with the Suomi-NPP Ozone Mapping and Profiler Suite (OMPS)." Atmospheric Measurement Techniques, 10 (2): 445-458 [10.5194/amt-10-445-2017]

    Lamsal, L. N., S. J. Janz, N. A. Krotkov, et al. K. E. Pickering, R. J. Spurr, M. G. Kowalewski, C. P. Loughner, J. H. Crawford, W. H. Swartz, and J. R. Herman. 2017. "High-resolution NO2 observations from the Airborne Compact Atmospheric Mapper: Retrieval and validation." Journal of Geophysical Research: Atmospheres, 122 (3): 1953-1970 [10.1002/2016jd025483]

    Lorente, A., K. Folkert Boersma, H. Yu, et al. S. Dörner, A. Hilboll, A. Richter, M. Liu, L. N. Lamsal, M. Barkley, I. De Smedt, M. Van Roozendael, Y. Wang, T. Wagner, S. Beirle, J.-T. Lin, N. Krotkov, P. Stammes, P. Wang, H. J. Eskes, and M. Krol. 2017. "Structural uncertainty in air mass factor calculation for NO<sub>2</sub> and HCHO satellite retrievals." Atmospheric Measurement Techniques, 10 (3): 759-782 [10.5194/amt-10-759-2017]

    Carn, S. A., V. E. Fioletov, C. A. McLinden, C. Li, and N. A. Krotkov. 2017. "A decade of global volcanic SO2 emissions measured from space." Scientific Reports, 7: 44095 [10.1038/srep44095]

    Zhang, Y., C. Li, N. A. Krotkov, et al. J. Joiner, V. Fioletov, and C. McLinden. 2017. "Continuation of long-term global SO2 pollution monitoring from OMI to OMPS." Atmospheric Measurement Techniques, 10 (4): 1495-1509 [10.5194/amt-10-1495-2017]

    Vinnikov, K. Y., R. R. Dickerson, N. A. Krotkov, E. S. Edgerton, and J. J. Schwab. 2017. "The net decay time of anomalies in concentrations of atmospheric pollutants." Atmospheric Environment, 160: 19-26 [10.1016/j.atmosenv.2017.04.006]

    Miles, G. M., R. Siddans, R. G. Grainger, et al. A. J. Prata, B. Fisher, and N. Krotkov. 2017. "Retrieval of volcanic SO2 from HIRS/2 using optimal estimation." Atmospheric Measurement Techniques, 10 (7): 2687-2702 [10.5194/amt-10-2687-2017]

    Krotkov, N. A., L. N. Lamsal, E. A. Celarier, et al. W. H. Swartz, S. V. Marchenko, E. J. Bucsela, K. L. Chan, M. Wenig, and M. Zara. 2017. "The version 3 OMI NO2 standard product." Atmospheric Measurement Techniques, 10 (9): 3133-3149 [10.5194/amt-10-3133-2017]

    Fioletov, V., C. A. McLinden, S. K. Kharol, et al. N. A. Krotkov, C. Li, J. Joiner, M. D. Moran, R. Vet, A. J. Visschedijk, and H. A. Denier van der Gon. 2017. "Multi-source SO2 emission retrievals and consistency of satellite and surface measurements with reported emissions." Atmospheric Chemistry and Physics, 17 (20): 12597-12616 [10.5194/acp-17-12597-2017]

    McLinden, C. A., V. Fioletov, N. A. Krotkov, et al. C. Li, K. F. Boersma, and C. Adams. 2016. "A Decade of Change in NO2 and SO2 over the Canadian Oil Sands As Seen from Space." Environ. Sci. Technol., 50 (1): 331-337 [10.1021/acs.est.5b04985]

    He, H., K. Y. Vinnikov, C. Li, et al. N. A. Krotkov, A. R. Jongeward, Z. Li, J. W. Stehr, J. C. Hains, and R. R. Dickerson. 2016. "Response of SO2and particulate air pollution to local and regional emission controls: A case study in Maryland." Earth's Future, [10.1002/2015ef000330]

    Li, C., N. C. Hsu, A. M. Sayer, et al. N. A. Krotkov, J. S. Fu, L. N. Lamsal, J. Lee, and S.-C. Tsay. 2016. "Satellite observation of pollutant emissions from gas flaring activities near the Arctic." Atmospheric Environment, 133: 1-11 [10.1016/j.atmosenv.2016.03.019]

    Ge, C., J. Wang, S. Carn, et al. K. Yang, P. Ginoux, and N. Krotkov. 2016. "Satellite-based global volcanic SO2emissions and sulfate direct radiative forcing during 2005-2012." J. Geophys. Res. Atmos., 121 (7): 3446-3464 [10.1002/2015jd023134]

    Krotkov, N. A., C. A. McLinden, C. Li, et al. L. N. Lamsal, E. A. Celarier, S. V. Marchenko, W. H. Swartz, E. J. Bucsela, J. Joiner, B. N. Duncan, K. F. Boersma, J. P. Veefkind, P. F. Levelt, V. E. Fioletov, R. R. Dickerson, H. He, Z. Lu, and D. G. Streets. 2016. "Aura OMI observations of regional SO2 and NO2 pollution changes from 2005 to 2015." Atmos. Chem. Phys., 16 (7): 4605-4629 [10.5194/acp-16-4605-2016]

    Carn, S., and N. Krotkov. 2016. "Ultraviolet Satellite Measurements of Volcanic Ash." Volcanic Ash, 217-231 [10.1016/b978-0-08-100405-0.00018-5]

    McLinden, C. A., V. Fioletov, M. W. Shephard, et al. N. Krotkov, C. Li, R. V. Martin, M. D. Moran, and J. Joiner. 2016. "Space-based detection of missing sulfur dioxide sources of global air pollution." Nature Geosci, 9: 496–500 [10.1038/ngeo2724]

    Zoogman, P., X. Liu, R. Suleiman, et al. W. Pennington, D. Flittner, J. Al-Saadi, B. Hilton, D. Nicks, M. Newchurch, J. Carr, S. Janz, M. Andraschko, A. Arola, B. Baker, B. Canova, C. Chan Miller, R. Cohen, J. Davis, M. Dussault, D. Edwards, J. Fishman, A. Ghulam, G. González Abad, M. Grutter, J. Herman, J. Houck, D. Jacob, J. Joiner, B. Kerridge, J. Kim, N. Krotkov, L. Lamsal, C. Li, A. Lindfors, R. Martin, C. McElroy, C. McLinden, V. Natraj, D. Neil, C. Nowlan, E. O׳Sullivan, P. Palmer, R. Pierce, M. Pippin, A. Saiz-Lopez, R. Spurr, J. Szykman, O. Torres, J. Veefkind, B. Veihelmann, H. Wang, J. Wang, and K. Chance. 2016. "Tropospheric emissions: Monitoring of pollution (TEMPO)." Journal of Quantitative Spectroscopy and Radiative Transfer, 186: 17-39 [10.1016/j.jqsrt.2016.05.008]

    Pickering, K. E., E. Bucsela, D. Allen, et al. A. Ring, R. Holzworth, and N. Krotkov. 2016. "Estimates of lightning NOx production based on OMI NO2 observations over the Gulf of Mexico." J. Geophys. Res. Atmos., 121 (14): 8668–8691 [10.1002/2015jd024179]

    Adams, C., E. N. Normand, C. A. McLinden, et al. A. E. Bourassa, N. D. Lloyd, D. A. Degenstein, N. A. Krotkov, M. Belmonte Rivas, K. F. Boersma, and H. Eskes. 2016. "Limb–nadir matching using non-coincident NO2 observations: proof of concept and the OMI-minus-OSIRIS prototype product." Atmospheric Measurement Techniques, 9 (8): 4103-4122 [10.5194/amt-9-4103-2016]

    Fioletov, V. E., C. A. McLinden, N. Krotkov, et al. C. Li, J. Joiner, N. Theys, S. Carn, and M. D. Moran. 2016. "A global catalogue of large SO2 sources and emissions derived from the Ozone Monitoring Instrument." Atmospheric Chemistry and Physics, 16 (18): 11497-11519 [10.5194/acp-16-11497-2016]

    Hughes, E. J., J. Yorks, N. A. Krotkov, A. M. da Silva, and M. McGill. 2016. "Using CATS Near-Realtime Lidar Observations to Monitor and Constrain Volcanic Sulfur Dioxide (SO2) Forecasts." Geophysical Research Letters, [10.1002/2016gl070119]

    Ialongo, I., J. Herman, N. Krotkov, et al. L. Lamsal, K. F. Boersma, J. Hovila, and J. Tamminen. 2016. "Comparison of OMI NO2 observations and their seasonal andweekly cycles with ground-based measurements in Helsinki." Atmospheric Measurement Techniques, 9 (10): 5203-5212 [10.5194/amt-9-5203-2016]

    Mok, J., N. A. Krotkov, A. Arola, et al. O. Torres, H. Jethva, M. Andrade, G. Labow, T. F. Eck, Z. Li, R. R. Dickerson, G. L. Stenchikov, S. Osipov, and X. Ren. 2016. "Impacts of brown carbon from biomass burning on surface UV and ozone photochemistry in the Amazon Basin." Nature Scientific Reports, 6: 36940 [10.1038/srep36940]

    Carn, S. A., K. Yang, A. J. Prata, and N. A. Krotkov. 2015. " Extending the long-term record of volcanic SO2 emissions with the Ozone Mapping and Profiler Suite nadir mapper ." Geophysical Research Letters, 42 (3): 925-932 [10.1002/2014gl062437]

    Fioletov, V. E., C. A. McLinden, N. A. Krotkov, and C. Li. 2015. " Lifetimes and emissions of SO2 from point sources estimated from OMI ." Geophysical Research Letters, 42 (6): 1969-1976 [10.1002/2015gl063148]

    Theys, N., I. De Smedt, J. van Gent, et al. T. Danckaert, T. Wang, F. Hendrick, T. Stavrakou, S. Bauduin, L. Clarisse, C. Li, N. Krotkov, H. Yu, H. Brenot, and M. Van Roozendael. 2015. "Sulfur dioxide vertical column DOAS retrievals from the Ozone Monitoring Instrument: Global observations and comparison to ground-based and satellite data." J. Geophys. Res. Atmos., 120 (6): 2470-2491 [10.1002/2014jd022657]

    Li, C., J. Joiner, N. A. Krotkov, and L. Dunlap. 2015. "A new method for global retrievals of HCHO total columns from the Suomi National Polar-orbiting Partnership Ozone Mapping and Profiler Suite." Geophysical Research Letters, 42 (7): 2515-2522 [10.1002/2015gl063204]

    Lamsal, L. N., B. N. Duncan, Y. Yoshida, et al. N. A. Krotkov, K. E. Pickering, D. G. Streets, and Z. Lu. 2015. "U.S. NO2 trends (2005–2013): EPA Air Quality System (AQS) data versus improved observations from the Ozone Monitoring Instrument (OMI)." Atmos. Env., 110: 130-143 [10.1016/j.atmosenv.2015.03.055]

    Ialongo, I., J. Hakkarainen, R. Kivi, et al. P. Anttila, N. A. Krotkov, K. Yang, C. Li, S. Tukiainen, S. Hassinen, and J. Tamminen. 2015. "Comparison of operational satellite SO2 products with ground-based observations in northern Finland during the Icelandic Holuhraun fissure eruption." Atmospheric Measurement Techniques, 8 (6): 2279-2289 [10.5194/amt-8-2279-2015]

    Marchenko, S., N. A. Krotkov, L. N. Lamsal, et al. E. A. Celarier, W. H. Swartz, and E. J. Bucsela. 2015. "Revising the slant column density retrieval of nitrogen dioxide observed by the Ozone Monitoring Instrument." J. Geophys. Res. Atmos., 120 (11): 5670-5692 [10.1002/2014jd022913]

    Choi, S., J. Joiner, Y. Choi, et al. B. N. Duncan, A. Vasilkov, N. Krotkov, and E. Bucsela. 2014. "First estimates of global free-tropospheric NO2 abundances derived using a cloud-slicing technique applied to satellite observations from the Aura Ozone Monitoring Instrument (OMI)." Atmos. Chem. Phys., 14 (19): 10565-10588 [10.5194/acp-14-10565-2014]

    Buchard, V., A. M. daSilva, P. Colarco, et al. N. A. Krotkov, R. R. Dickerson, J. W. Stehr, G. Mount, E. Spinei, H. L. Arkinson, and H. He. 2014. "GEOS-5 sulfur dioxide simulations during the Frostburg, MD 2010 field campaign." Atmos. Chem. Phys., 14: 1929-1941 [10.5194/acp-14-1929-2014]

    Rocha-Lima, A., J. V. Martins, L. A. Remer, et al. N. A. Krotkov, M. H. Tabacniks, Y. Ben-Ami, and P. Artaxo. 2014. "Optical, microphysical and compositional properties of the Eyjafjallajökull volcanic ash." Atmos. Chem. Phys., 14: 10,649-10,661 [10.5194/acp-14-10649-2014]

    McLinden, C. A., V. Fioletov, K. F. Boersma, et al. S. K. Kharol, N. A. Krotkov, L. N. Lamsal, P. A. Makar, R. V. Martin, J. P. Veefkind, and K. Yang. 2014. "Improved satellite retrievals of NO2 and SO2 over the Canadian oil sands and comparisons with surface measurements." Atmospheric Chemistry and Physics, 14 (7): 3637-3656 [10.5194/acp-14-3637-2014]

    Ialongo, I., J. Hakkarainen, N. Hyttinen, et al. J.-P. Jaklanen, L. Johansson, K. F. Boersma, N. A. Krotkov, and J. Tamminen. 2014. "Characterization of OMI tropospheric NO2 over the Baltic Sea region." Atmos. Chem. Phys., 14: 7795-7805 [10.5194/acp-14-7795-2014]

    Duncan, B. N., A. I. Prados, L. Lamsal, et al. Y. Liu, D. Streets, P. Gupta, E. Hilsenrath, R. A. Kahn, J. E. Nielsen, A. Beyersdorf, S. Burton, A. Fiore, J. Fishman, D. Henze, C. Hostetler, N. A. Krotkov, P. Lee, M. Lin, S. Pawson, G. Pfister, K. E. Pickering, R. B. Pierce, Y. Yoshida, and L. Ziemba. 2014. "Satellite data of atmospheric pollution for U.S. air quality applications: Examples of applications, summary of data end-user resources, answers to FAQs, and common mistakes to avoid." Atmospheric Environment, 94: 647-662 [10.1016/j.atmosenv.2014.05.061]

    Buchard, V. J., A. M. Da Silva, P. R. Colarco, et al. N. A. Krotkov, R. R. Dickerson, J. W. Stehr, G. Mount, E. Spinei, H. L. Arkinson, and H. He. 2014. "Evaluation of GEOS-5 sulfur dioxide simulations during the Frostburg, MD 2010 field campaign." Atmos. Chem. Phys., 14 (4): 1929-1941 [10.5194/acp-14-1929-2014]

    Philip, S., R. V. Martin, J. R. Pierce, et al. J. L. Jimenez, Q. Zhang, M. R. Canagaratna, D. V. Spracklen, C. R. Nowlan, L. N. Lamsal, M. J. Cooper, and N. A. Krotkov. 2014. "Spatially and seasonally resolved estimate of the ratio of organic mass to organic carbon." Atmospheric Environment, 87: 34-40 [10.1016/j.atmosenv.2013.11.065]

    Flynn, C. M., K. E. Pickering, J. H. Crawford, et al. L. N. Lamsal, N. A. Krotkov, J. R. Herman, A. Weinheimer, G. Chen, X. Liu, J. Szykman, S.-C. Tsay, C. P. Loughner, J. Hains, P. Lee, R. R. Dickerson, J. W. Stehr, and L. Brent. 2014. "Relationship between column-density and surface mixing ratio: Statistical analysis of O3 and NO2 data from the July 2011 Maryland DISCOVER-AQ mission." Atmospheric Environment, 92: 429-441 [10.1016/j.atmosenv.2014.04.041]

    Nowlan, C. R., R. V. Martin, S. Philip, et al. L. N. Lamsal, N. A. Krotkov, E. A. Marais, S. Wang, and Q. Zhang. 2014. "Global dry deposition of nitrogen dioxide and sulfur dioxide inferred from space-based measurements." Global Biogeochemical Cycles, 28 (10): 1025-1043 [10.1002/2014gb004805]

    Lamsal, L. N., N. A. Krotkov, E. A. Celarier, et al. W. H. Swartz, K. E. Pickering, E. J. Bucsela, J. F. Gleason, R. V. Martin, S. Philip, H. Irie, A. M. Cede, J. R. Herman, A. Weinheimer, J. J. Szykman, and T. N. Knepp. 2014. "Evaluation of OMI operational standard NO2 column retrievals using in situ and surface-based NO2 observations." Atmos. Chem. Phys., 14: 11,587-11,609 [10.5194/acp-14-11587-2014]

    Streets, D. G., T. Canty, G. R. Carmichael, et al. B. de Foy, R. R. Dickerson, B. N. Duncan, D. P. Edwards, J. A. Haynes, D. K. Henze, M. R. Houyoux, D. J. Jacobi, N. A. Krotkov, L. N. Lamsal, Y. Liu, Z. Lu, R. V. Martini, G. G. Pfister, R. W. Pinder, R. J. Salawitch, and K. J. Wechti. 2013. "Emissions estimation from satellite retrievals: A review of current capability." Atmospheric Environment, 77: 1011-1042 [10.1016/j.atmosenv.2013.05.051]

    Bucsela, E. J., N. A. Krotkov, L. N. Lamsal, et al. W. H. Swartz, P. K. Bhartia, K. F. Boersma, J. P. Veefkind, J. F. Gleason, and K. E. Pickering. 2013. "A new stratospheric and tropospheric NO2 retrieval algorithm for nadir-viewing satellite instruments: applications to OMI." Atmospheric Measurement Techniques, 6 (10): 2607-2626 [10.5194/amt-6-2607-2013]

    Lamsal, L. N., R. V. Martin, D. D. Parrish, and N. A. Krotkov. 2013. "Scaling Relationship for NO2 Pollution and Urban Population Size: A Satellite Perspective." Environmental Science & Technology, 47 (14): 7855-7861 [10.1021/es400744g]

    Duncan, B. N., Y. Yoshida, B. de Foy, et al. L. N. Lamsal, D. G. Streets, Z. Lu, K. E. Pickering, and N. A. Krotkov. 2013. "The observed response of Ozone Monitoring Instrument (OMI) NO2 columns to NOx emission controls on power plants in the United States: 2005–2011." Atmospheric Environment, 81: 102-111 [10.1016/j.atmosenv.2013.08.068]

    Wang, J., S. Park, J. Zeng, et al. C. Ge, K. Yang, S. Carn, N. A. Krotkov, and A. H. Omar. 2013. "Modeling of 2008 Kasatochi volcanic sulfate direct radiative forcing: assimilation of OMI SO₂ plume height data and comparison with MODIS and CALIOP observations." Atmos. Chem. Phys., 13 (4): 1895-1912 [10.5194/acp-13-1895-2013]

    Oetjen, H., S. Baidar, N. A. Krotkov, et al. L. N. Lamsal, M. Lechner, and R. Volkamer. 2013. "Airborne MAX-DOAS measurements over California: Testing the NASA OMI tropospheric NO₂ product." J. Geophys. Res. Atmos., 118 (13): 7400–7413 [10.1002/jgrd.50550]

    Wang, J., S. Park, J. Zeng, et al. C. Ge, K. Yang, S. Carn, N. Krotkov, and A. H. Omar. 2013. "Modeling of 2008 Kasatochi volcanic sulfate direct radiative forcing: assimilation of OMI SO2 plume height data and comparison with MODIS and CALIOP observations." Atmos. Chem. Phys., 13 (4): 1895-1912 [10.5194/acp-13-1895-2013]

    Oetjen, H., S. Baidar, N. A. Krotkov, et al. L. N. Lamsal, M. Lechner, and R. Volkamer. 2013. "Airborne MAX-DOAS measurements over California: Testing the NASA OMI tropospheric NO 2 product." J. Geophys. Res. Atmos., 118 (13): 7400-7413 [10.1002/jgrd.50550]

    Carn, S. A., N. A. Krotkov, K. Yang, and A. J. Krueger. 2013. "Measuring global volcanic degassing with the Ozone Monitoring Instrument (OMI)." Geological Society, London, Special Publications, 380 (1): 229-257 [10.1144/sp380.12]

    Fioletov, V. E., C. A. McLinden, N. Krotkov, et al. K. Yang, D. G. Loyola, P. Valks, N. Theys, M. Van Roozendael, C. R. Nowlan, K. Chance, X. Liu, C. Lee, and R. V. Martin. 2013. "Application of OMI, SCIAMACHY, and GOME-2 satellite SO 2 retrievals for detection of large emission sources." J. Geophys. Res. Atmos., 118 (19): 11,399-11,418 [10.1002/jgrd.50826]

    Li, C., J. Joiner, N. A. Krotkov, and P. K. Bhartia. 2013. "A fast and sensitive new satellite SO2 retrieval algorithm based on principal component analysis: Application to the ozone monitoring instrument." Geophysical Research Letters, 40 (23): 6314-6318 [10.1002/2013gl058134]

    Lu, Z., D. G. Streets, B. de Foy, and N. A. Krotkov. 2013. "Ozone Monitoring Instrument Observations of Interannual Increases in SO 2 Emissions from Indian Coal-Fired Power Plants during 2005–2012." Environ. Sci. Technol., 47 (24): 13993-14000 [10.1021/es4039648]

    He, H., C. Li, C. P. Loughner, et al. Z. Li, N. A. Krotkov, K. Yang, L. Wang, Y. Zheng, X. Bao, G. Zhao, and R. R. Dickerson. 2012. "SO2 over central China: Measurements, numerical simulations and the tropospheric sulfur budget." J. Geophys. Res., 117 (D16): D00K37 [10.1029/2011JD016473]

    Eck, T. F., B. N. Holben, J. S. Reid, et al. D. M. Giles, M. A. Rivas, R. P. Singh, S. N. Tripathi, C. J. Bruegge, S. E. Platnick, G. T. Arnold, N. A. Krotkov, S. A. Carn, A. Siniuk, O. Dubovik, A. Arola, J. S. Schafer, P. Artaxo, A. Smirnov, H. Chen, and P. Goloub. 2012. "Fog- and cloud-induced aerosol modification observed by the Aerosol Robotic Network (AERONET)." J Geophys Res, 117 (D7): D07206 [10.1029/2011JD016839]

    Campbell, J., E. J. Welton, N. A. Krotkov, et al. K. Yang, S. A. Stewart, and M. Fromm. 2012. "Likely seeding of cirrus clouds by stratospheric Kasatochi volcanic aerosol particles near a mid-latitude tropopause fold." Atmospheric Environment, 46: 441-448 [10.1016/j.atmosenv.2011.09.027]

    Hsu, N.-Y. C., C. Li, N. A. Krotkov, et al. Q. Liang, K. Yang, and S.-C. Tsay. 2012. "Rapid transpacific transport in autumn observed by the A-train satellites." J. Geophys. Res., 117 (D6): D06312 [10.1029/2011JD016626]

    McLinden, C., C. McLinden, V. Fioletov, et al. K. Boersma, N. Krotkov, C. Sioris, J. Veefkind, and K. Yang. 2012. "Air quality over the Canadian oil sands: A first assessment using satellite observations." Geophysical Research Letters, 39 (4): L04804 [10.1029/2011GL050273]

    Walter, D., K. Heue, A. Rauthe-Schoch, et al. C. A. Brenninkmeijer, L. Lamsal, N. Krotkov, and U. Platt. 2012. "Flux calculation using CARIBIC DOAS aircraft measurements: SO2 emission of Norilsk." J. Geophys. Res., 117 (D11): D11305 [10.1029/2011JD017335]

    Antón, M., A. Valenzuela, R. Román, et al. H. Lyamani, N. Krotkov, A. Arola, F. J. Olmo, and L. Alados-Arboledas. 2012. "Influence of desert dust intrusions on ground-based and satellite-derived ultraviolet irradiance in southeastern Spain." J. Geophys. Res., 117 (D19): [10.1029/2012jd018056]

    Veefkind, J., K. Boersma, J. Wang, et al. T. Kurosu, N. A. Krotkov, K. Chance, and P. Levelt. 2011. "Global satellite analysis of the relation between aerosols and short-lived trace gases." Atmos. Chem. Phys., 11 (3): 1255-1267 [10.5194/acp-11-1255-2011]

    Lee, C., R. Martin, A. Donkelaar, et al. H. Lee, R. Dickerson, J. Hains, N. A. Krotkov, A. Richter, K. Vinnikov, and J. Schwab. 2011. "SO2 emissions and lifetimes: Estimates from inverse modeling using in situ and global, space-based (SCIAMACHY and OMI) observations." J Geophys Res, 116 (D6): D06304 [10.1029/2010JD014758]

    Carn, S. A., K. D. Froyd, B. E. Anderson, et al. P. Wennberg, J. Crounse, K. Spencer, J. E. Dibb, N. A. Krotkov, E. V. Browell, J. W. Hair, G. Diskin, G. Sachse, and S. A. Vay. 2011. "In situ measurements of tropospheric volcanic plumes in Ecuador and Colombia during TC 4." Journal of Geophysical Research, 116: D00J24 [10.1029/2010jd014718]

    Fioletov, V. E., C. A. McLinden, N. Krotkov, M. D. Moran, and K. Yang. 2011. "Estimation of SO 2 emissions using OMI retrievals." Geophysical Research Letters, 38 (21): [10.1029/2011gl049402]

    Morris, G., W. Komhyr, J. Hirokawa, et al. J. Flynn, N. A. Krotkov, B. Lefer, and F. Ngan. 2010. "A Balloon Sounding Technique for Measuring SO2 Plumes." Journal of Atmospheric and Oceanic Technology, 27 (8): 1318-1330 [10.1175/2010JTECHA1436.1]

    Cachorro, V., C. Toledano, M. Anton, et al. A. Berjon, A. Frutos, J. Vilaplana, A. Arola, and N. A. Krotkov. 2010. "Comparison of UV irradiances from Aura/Ozone Monitoring Instrument (OMI) with Brewer measurements at El Arenosillo (Spain) – Part 2: Analysis of site aerosol influence." Atmos. Chem. Phys., 10 (23): 11867-11880 [10.5194/acp-10-11867-2010]

    Krotkov, N. A., M. Schoeberl, G. Morris, S. Carn, and K. Yang. 2010. "Dispersion and lifetime of the SO 2 cloud from the August 2008 Kasatochi eruption." J Geophys Res, 115 (D2): D00L20 [10.1029/2010JD013984]

    Li, C., N. A. Krotkov, D. Streets, et al. K. He, S.-C. Tsay, and J. F. Gleason. 2010. "Recent large reduction in sulfur dioxide emissions from Chinese power plants observed by the Ozone Monitoring Instrument." Geophysical Research Letters, 37 (8): L08807 [10.1029/2010GL042594]

    Li, C., N. A. Krotkov, R. R. Dickerson, et al. Z. Li, K. Yang, and M. Chin. 2010. "Transport and evolution of a pollution plume from northern China: A satellite-based case study." J Geophys Res, 115 (D7): D00K03 [10.1029/2009JD012245]

    Antón, M., V. E. Cachorro, J. M. Vilaplana, et al. C. Toledano, N. A. Krotkov, A. Arola, A. Serrano, and B. de la Morena. 2010. "Comparison of UV irradiances from Aura/Ozone Monitoring Instrument (OMI) with Brewer measurements at El Arenosillo (Spain) – Part 1: Analysis of parameter influence." Atmos. Chem. Phys., 10 (13): 5979-5989 [10.5194/acp-10-5979-2010]

    Xu, M., X.-Z. Liang, W. Gao, and N. Krotkov. 2010. "Comparison of TOMS retrievals and UVMRP measurements of surface spectral UV radiation in the United States." Atmos. Chem. Phys., 10 (18): 8669-8683 [10.5194/acp-10-8669-2010]

    Spinei, E., S. A. Carn, N. A. Krotkov, et al. G. H. Mount, K. Yang, and A. Krueger. 2010. "Validation of ozone monitoring instrument SO 2 measurements in the Okmok volcanic cloud over Pullman, WA, July 2008." Journal of Geophysical Research, 115: D00L08 [10.1029/2009jd013492]

    Yang, K., X. Liu, P. K. Bhartia, et al. N. A. Krotkov, S. A. Carn, E. J. Hughes, A. J. Krueger, R. J. Spurr, and S. G. Trahan. 2010. "Direct retrieval of sulfur dioxide amount and altitude from spaceborne hyperspectral UV measurements: Theory and application." Journal of Geophysical Research, 115: D00L09 [10.1029/2010jd013982]

    Newman, P., L. Oman, A. R. Douglass, et al. E. L. Fleming, S. M. Frith, M. M. Hurwitz, S. R. Kawa, C. H. Jackman, N. A. Krotkov, E. R. Nash, J. E. Nielsen, S. Pawson, R. S. Stolarski, and G. J. Velders. 2009. "What would have happened to the ozone layer if chlorofluorocarbons (CFCs) had not been regulated?" Atmos. Chem. Phys., 9 (6): 2113-2128 [10.5194/acp-9-2113-2009]

    Corr, C., N. A. Krotkov, S. Madronich, et al. J. Shusser, B. Holben, W. Gao, J. Flynn, B. Lefer, and S. Kreidenweis. 2009. "Retrieval of aerosol single scattering albedo at ultraviolet wavelengths at the T1 site during MILAGRO." Atmos. Chem. Phys., 9 (15): 5813-5827 [10.5194/acp-9-5813-2009]

    De, F., N. A. Krotkov, N. Bei, et al. S. Herndon, L. Huey, A. Martinez, L. Ruiz-Suarez, and L. Molina. 2009. "Hit from both sides: tracking industrial and volcanic plumes in Mexico City with surface measurements and OMI SO₂ retrievals during the MILAGRO field campaign." Atmos. Chem. Phys., 9 (24): 9599-9617 [10.5194/acp-9-9599-2009]

    Kazadzisl, S., A. Bais, A. Arola, et al. N. A. Krotkov, N. Kouremen, and C. Meleti. 2009. "Ozone Monitoring Instrument spectral UV irradiance products: comparison with ground based measurements at an urban environment." Atmos. Chem. Phys., 9 (2): 585-594 [10.5194/acp-9-585-2009]

    Krueger, A., N. A. Krotkov, K. Yang, et al. S. Carn, G. A. Vicente, and W. Schroeder. 2009. "Applications of Satellite-Based Sulfur Dioxide Monitoring." IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing, 2 (4): 293-298 [10.1109/JSTARS.2009.2037334]

    Lee, C., V. Martin, A. Donkelaar, et al. G. O'Byrne, N. A. Krotkov, A. Richter, L. Huey, and J. Holloway. 2009. "Retrieval of vertical columns of sulfur dioxide from SCIAMACHY and OMI: Air mass factor algorithm development, validation, and error analysis." J. Geophys. Res., 114 (D22303): [10.1029/2009JD012123]

    Carn, S. A., A. J. Krueger, N. A. Krotkov, K. Yang, and K. D. Evans. 2009. "Tracking volcanic sulfur dioxide clouds for aviation hazard mitigation." Nat Hazards, 51 (2): 325-343 [10.1007/s11069-008-9228-4]

    Arola, A., S. Kazadzis, A. Lindfors, et al. N. A. Krotkov, J. Kujanp"a"a, J. Tamminen, A. Bais, A. Sarra, J. Villaplana, C. Brogniez, A. Siam, M. Janouch, P. Weihs, A. Webb, T. Koskela, N. Kouremen, D. Meloni, V. Buchard, F. Auriol, I. Ialongo, M. Staneck, S. Simic, A. Smedley, and S. Kinne. 2009. "A new approach to correct for absorbing aerosols in OMI UV." Geophys Res Lett, 36 (22): L22805 [10.1029/2009GL041137]

    Witte, J., M. Schoeberl, A. Douglass, et al. J. Gleason, N. A. Krotkov, J. Gille, K. E. Pickering, and N. Livesey. 2009. "Satellite observations of changes in air quality during the 2008 Beijing Olympics and Paralympics." Geophys Res Lett, 36 (17): L17803 [10.1029/2009GL039236]

    Yang, K., P. F. Levelt, P. K. Bhartia, et al. S. A. Carn, A. J. Krueger, and N. A. Krotkov. 2009. "Improving retrieval of volcanic sulfur dioxide from backscattered UV satellite observations." Geophysical Research Letters, 36 (3): L03102 [10.1029/2008GL036036]

    Yang, K., N. A. Krotkov, A. J. Krueger, and S. A. Carn. 2009. "Estimating the altitude of volcanic sulfur dioxide plumes from space borne hyper-spectral UV measurements." Geophys Res Lett, 36 (L10803): [10.1029/2009GL038025]

    de Foy, B., N. A. Krotkov, N. Bei, et al. S. C. Herndon, L. G. Huey, A.-P. Martínez, L. G. Ruiz-Suárez, E. C. Wood, M. Zavala, and L. T. Molina. 2009. "Hit from both sides: tracking industrial and volcanic plumes in Mexico City with surface measurements and OMI SO2 retrievals during the MILAGRO field campaign." Atmos. Chem. Phys., 9 (24): 9599-9617 [10.5194/acp-9-9599-2009]

    Krueger, A., N. Krotkov, S. Carn, and C. El. 2008. "El Chichon: The genesis of volcanic sulfur dioxide monitoring from space." J Volcanol Geotherm Res, 175 (4): 408-414 [10.1016/j.jvolgeores.2008.02.026]

    Tzortziou, M. A., N. A. Krotkov, A. M. Cede, J. R. Herman, and A. P. Vasilkov. 2008. "A new technique for retrieval of tropospheric and stratospheric ozone profiles using sky radiance measurements at multiple view angles: Application to a Brewer spectrometer." Journal of Geophysical Research – Atmospheres, 113 (D6): D06304 [10.1029/2007JD009093]

    Krotkov, N. A., B. McClure, R. R. Dickerson, et al. S. A. Carn, C. Li, P. K. Bhartia, K. Yang, A. J. Krueger, Z. Li, P. F. Levelt, H. Chen, P. Wang, and D. Lu. 2008. "Validation of SO2 retrievals from the Ozone Monitoring Instrument over NE China." J Geophys Res, 113 (D16S40, doi:101029/):

    Hassinen, S., J. Tamminen, A. Tanskanen, et al. G. Leppelmeier, A. Mälkki, T. Koskela, J. M. Karhu, K. Lakkala, P. Veefkind, N. Krotkov, and O. Aulamo. 2008. "Description and validation of the OMI very fast delivery products." J Geophys Res, 113 (D16S35): [10.1029/2007JD008784]

    Carn, S., A. Krueger, S. Arellano, N. Krotkov, and K. Yang. 2008. "Daily monitoring of Ecuadorian volcanic degassing from space." Journal of Volcanology and Geothermal Research, 176 (1): 141-150 [10.1016/j.jvolgeores.2008.01.029]

    Carn, S., N. Krotkov, K. Yang, et al. R. Hoff, A. Prata, A. Krueger, S. Loughlin, and P. Levelt. 2007. "Extended observations of volcanic SO2 and sulfate aerosol in the stratosphere." Atmos Chem Phys Discuss, 7: 2857-2871.

    Carn, S., A. Krueger, N. Krotkov, K. Yang, and P. Levelt. 2007. "Sulfur dioxide emissions from Peruvian copper smelters detected by the Ozone Monitoring Instrument." Geophy Res Lett, 34: L09801.

    Anton, M., V. Cachorro, J. Vilaplana, et al. N. Krotkov, A. Serrano, C. Toledano, B. de la Morena, and J. Herman. 2007. "Total ozone mapping spectrometer retrievals of noon erythermal-CIE ultraviolet irradiance compared with Brewer ground-based measurements at E1 Arenosillo (southwestern Spain)." J Geopohys Res, 112: D11206.

    Antón, M., V. E. Cachorro, J. M. Vilaplana, et al. N. A. Krotkov, A. Serrano, C. Toledano, B. de la Morena, and J. R. Herman. 2007. "Total ozone mapping spectrometer retrievals of noon erythemal-CIE ultraviolet irradiance compared with Brewer ground-based measurements at El Arenosillo (southwestern Spain)." Journal of Geophysical Research, 112 (D11): D11206 [10.1029/2006jd007254]

    Yang, K., N. A. Krotkov, A. J. Krueger, et al. S. A. Carn, P. K. Bhartia, and P. F. Levelt. 2007. "Retrieval of large volcanic SO 2 columns from the Aura Ozone Monitoring Instrument: Comparison and limitations." Journal of Geophysical Research, 112 (D24): D24S43 [10.1029/2007jd008825]

    Tanskanen, A., A. Lindfors, A. Määttä, et al. N. Krotkov, J. Herman, J. Kaurola, T. Koskela, K. Lakkala, V. Fioletov, G. Bernhard, R. McKenzie, Y. Kondo, M. O'Neill, H. Slaper, P. den Outer, A. F. Bais, and J. Tamminen. 2007. "Validation of daily erythemal doses from Ozone Monitoring Instrument with ground-based UV measurement data." Journal of Geophysical Research, 112 (D24): D24S44 [10.1029/2007jd008830]

    Dickerson, R. R., C. Li, Z. Li, et al. L. T. Marufu, J. W. Stehr, B. McClure, N. Krotkov, H. Chen, P. Wang, X. Xia, X. Ban, F. Gong, J. Yuan, and J. Yang. 2007. "Aircraft observations of dust and pollutants over northeast China: Insight into the meteorological mechanisms of transport." Journal of Geophysical Research, 112 (D24): D24S90 [10.1029/2007jd008999]

    Cede, A., J. Herman, A. Richter, N. Krotkov, and J. Burrows. 2006. "Measurements of nitrogen dioxide total column amounts using a Brewer double spectrophotometer in direct Sun mode." Journal of Geophysical Research, 111 (D5): D05304 [10.1029/2005jd006585]

    Cede, A., J. Herman, A. Richter, N. Krotkov, and J. Burrows. 2006. "Measurements of Nitrogen Dioxide Total Column Amounts Using a Brewer Spectrometer in Direct Sun Mode." J Geophys Res, 111: D05304.

    Belanger, S., W. Vincent, P. Larouche, et al. N. Krotkov, H. Xie, and M. Babin. 2006. "Photomineralization of terrigenous dissolved organic matter in Arctic coastal waters from 1979 to 2003: Interannual variability and implications of climate change." Global Biogeochem Cycles, 20: GB4005.

    Tanskanen, A., N. Krotkov, J. Herman, and A. Arola. 2006. "Surface Ultraviolet Irradiance from OMI." IEEE Trans on Geosc And Remote Sensing, 44 (5): IGRSD2 1267-1271.

    Tanskanen, A., N. Krotkov, J. Herman, and A. Arola. 2006. "Surface ultraviolet irradiance from OMI." IEEE Transactions on Geoscience and Remote Sensing, 44 (5): 1267-1271 [10.1109/tgrs.2005.862203]

    Krotkov, N. A., S. Carn, A. J. Krueger, P. K. Bhartia, and K. Yang. 2006. "Band Residual Difference Algorithm for Retrieval of SO2 from the Aura Ozone Monitoring Instrument (OMI)." IEEE Transactions on Geoscience and Remote Sensing, 44 (5): 1259-1266 [10.1109/TGRS.2005.861932]

    Kazantzidis, A., A. Bais, J. Gröbner, et al. J. R. Herman, S. Kazadzis, N. A. Krotkov, E. Kyrö, P. N. den Outer, K. Garane, P. Görts, K. Lakkala, C. Meleti, H. Slaper, R. Tax, T. Turunen, and C. Zerefos. 2006. "Comparison of satellite-derived UV irradiances with ground-based measurements at four European stations." J Geophys Res, 111: D13207 [10.1029/2005JD006672]

    Krotkov, N. A., P. K. Bhartia, J. R. Herman, et al. J. Slusser, G. Scott, G. J. Labow, A. P. Vasilkov, T. F. Eck, O. Dubovik, and B. N. Holben. 2005. "Aerosol ultraviolet absorption experiment (2002 to 2004), part 2: absorption optical thickness, refractive index, and single scattering albedo." Opt Eng, 44 (4): 041005-1 - 041005-17 [10.1117/1.1886819]

    Arola, A., S. Kazadzis, N. Krotkov, et al. A. Bias, J. Herman, and K. Lakkala. 2005. "Assessment of TOMS UV bias due to absorbing aerosols." J. Geophys. Res., 110 (D23): D23211 [10.1029/2005JD005913]

    Krotkov, N. A., P. K. Bhartia, J. R. Herman, et al. J. Slusser, G. J. Labow, G. Scott, G. Janson, T. F. Eck, and B. N. Holben. 2005. "Aerosol ultraviolet absorption experiment (2002 to 2004), part 1: ultraviolet multifilter rotating shadowband radiometer calibration and intercomparison with CIMEL sunphotometers." Opt Eng, 44 (4): 041004-1 - 041004-17 [10.1117/1.1886818]

    Carn, S. A., A. J. Krueger, N. A. Krotkov, and M. A. Gray. 2004. "Fire at Iraqi sulfur plant emits SO2 clouds detected by Earth Probe TOMS." Geophys. Res. Lett., 31 (L19105): 10.1029/2004GL020719.

    Ahmad, Z., P. Bhartia, and N. Krotkov. 2004. "Spectral properties of backscattered UV radiation in cloudy atmospheres." J. Geophys. Res., 109 (D1): D01201 [10.1029/2003JD003395]

    Fioletov, V. E., M. G. Kimlin, N. Krotkov, et al. L. J. McArthur, J. B. Kerr, D. I. Wardle, J. R. Herman, R. Meltzer, T. W. Mathews, and J. Kaurola. 2004. "UV index climatology over the United States and Canada from ground-based and satellite estimates." J. Geophys. Res., 109 (D22): [10.1029/2004jd004820]

    Bais, A. F., S. Madronich, J. Crawford, et al. S. R. Hall, B. Mayer, M. van Weele, J. Lenoble, J. G. Calvert, C. A. Cantrell, R. E. Shetter, A. Hofzumahaus, P. Koepke, P. S. Monks, G. Frost, R. McKenzie, N. Krotkov, A. Kylling, W. H. Swartz, S. Lloyd, G. Pfister, T. J. Martin, E.-P. Roeth, E. Griffioen, A. Ruggaber, M. Krol, A. Kraus, G. D. Edwards, M. Mueller, B. L. Lefer, P. Johnston, H. Schwander, D. Flittner, B. G. Gardiner, J. Barrick, and R. Schmitt. 2003. "International Photolysis Frequency Measurement and Model Intercomparison (IPMMI): Spectral actinic solar flux measurements and modeling." J. Geophys. Res., 108 (D16): 8543 [doi:10.1029/2002JD002891]

    Arola, A., J. Kaurola, L. Koskinen, et al. A. Tanskanen, T. Tikkanen, P. Taalas, J. R. Herman, N. Krotkov, and V. Fioletov. 2003. " A new approach to estimating the albedo for snow-covered surfaces in the satellite UV method." J. Geophys. Res., 108 (D17): 4531 [doi:10.1029/2003JD003492]

    Carn, S. A., A. J. Krueger, G. J. Bluth, et al. S. J. Schaefer, N. A. Krotkov, I. M. Watson, and S. Datta. 2003. "Volcanic eruption detection by the Total Ozone Mapping Spectrometer (TOMS) instruments: a 22-year record of sulphur dioxide and ash emissions." Geological Society, London, Special Publications, 213 (1): 177-202 [10.1144/gsl.sp.2003.213.01.11]

    Krotkov, N. A., J. R. Herman, P. K. Bhartia, et al. C. Seftor, A. Arola, J. Kaurola, L. Koskinen, S. Kalliskota, P. Taalas, and I. Geogdzhaev. 2002. "Version 2 TOMS UV algorithm: problems and enhancements." Opt. Eng., 41 (12): 3028-3039 [doi: 10.1117/1.1519541]

    Krotkov, N., J. Herman, P. K. Bhartia, et al. C. Seftor, A. Arola, J. Kaurola, S. Kalliskota, P. Taalas, and I. V. Geogdzhayev. 2002. "Version 2 total ozone mapping spectrometer ultraviolet algorithm: problems and enhancements." Optical Engineering, 41 (12): 3028-3039 [10.1117/1.1519541]

    Vasilkov, A., J. Herman, N. Krotkov, et al. M. Kahru, B. Mitchell, and N. Hsu. 2002. "Problems in assessment of the UV penetration into natural waters from space-based measurements." Optical Engineering, 41: 3019-3027.

    Masserot, D., J. Lenoble, C. Brogniez, et al. M. Houet, N. Krotkov, and R. McPeters. 2002. "Retrieval of ozone column from global irradiance measurements and comparison with TOMS data. A year of data in the Alps." Geophysical Research Letters, 29 (9): 23-1-23-4 [10.1029/2002gl014823]

    Krotkov, N. A., O. Torres, C. Seftor, et al. A. Krueger, A. B. Kostinski, W. Rose, G. Bluth, D. Schneider, and S. Schaefer. 1999. "Comparison of TOMS and AVHRR Volcanic Ash Retrievals from the August 1992 Eruption of Mt Spurr." Geophys Res Lett, 26 (4): 455-458 [10.1029/1998GL900278]

    Seftor, C. J., N.-Y. C. Hsu, J. R. Herman, et al. P. K. Bhartia, O. Torres, W. Rose, D. Schneider, and N. Krotkov. 1997. "Detection of volcanic ash clouds from Nimbus-7/Total Ozone Mapping Spectrometer." J. Geophys. Res., 102 (D14): 16749-16760 [10.1029/97JD00925]

    Selected Public Outreach

    NASA Satellite Finds Unreported Sources of Toxic Air Pollution 6 / 2016 - Present
    http://www.nasa.gov/press-release/nasa-satellite-finds-unreported-sources-of-toxic-air-pol

    Using a new satellite-based method, scientists at NASA, Environment and Climate Change Canada, and two universities have located 39 unreported and major human-made sources of toxic sulfur dioxide emissions.

    NASA Scientists Scrutinize Arctic Gas Flaring Pollution 4 / 2016 - Present
    http://www.nasa.gov/feature/goddard/2016/nasa-scientists-scrutinize-arctic-gas-flaring-pol

    Flaring of waste natural gas from industrial oil fields in the Northern Hemisphere is a potential source of significant amounts of nitrogen dioxide and black carbon to the Arctic, according to a new NASA study.

    Brief Bio

    EDUCATION
    Ph.D., Oceanography, P.P.Shirshov Institute of Oceanology, Russian Academy of Sciences, 1990
    Post-Graduate School, Moscow Institute of Physics and Technology (MIPT) 1987-1990
    M.S., Remote Sensing, Moscow Institute of Physics and Technology (MIPT), 1985
    B.S., Physics, Moscow Institute of Physics and Technology (MIPT), 1983

    FIELDS OF SPECIALIZATION
    Atmospheric chemistry, remote sensing of atmospheric trace gases and aerosols, theory and numerical methods in radiative transfer, retrieval algorithm development of atmospheric composition (aerosols and gases) from space (atmosphere, ocean and volcanic plumes monitoring) and ground air quality research.

    EXPERIENCE SUMMARY

    Dr. Nickolay A. Krotkov has over 30 years experience in radiative transfer, remote sensing observations, retrieval algorithm development, data analysis and research in the field of atmospheric composition (gases and aerosols). His Ph. D work in oceanography included radiative transfer modeling of the polarization effects of the solar radiation in the atmosphere-ocean system, as applied to passive spectral and polarization remote sensing of the atmospheric aerosols and water quality. Since 1993 he works with NASA Goddard Space Flight Center scientists to improve retrievals and understanding of Earth’s gas species such as sulfur dioxide, nitrogen dioxide, ozone and aerosols using remote sensing observations from satellite platforms and ground. His experience in radiative transfer and retrievals has led to algorithms for operational satellite data production. He developed first satellite algorithm for mapping surface UV irradiance from TOMS ozone and reflectivity data, which was adopted by the Finnish Meteorological Institute (FMI) for the Ozone Monitoring Instrument (OMI) production data (2004-current). In 2004 he developed a passive remote sensing method that led to discovery of enhanced column UV aerosol absorption due to organic aerosol. In part through his work absorbing aerosols (e.g., “brown” organic carbon) are now recognized as key to a complete understanding of surface UV radiation and atmospheric photochemistry. He developed a first operational OMI algorithm for retrieving sulfur dioxide from volcanoes and anthropogenic pollution and serves as principle investigator for the OMI volcanic and pollution sulfur dioxide products. Dr. Krotkov’s empirical and theoretical analysis of the sulfur dioxide data has led to quantification of passive emissions from active volcanoes and of anthropogenic pollution sources affecting air quality in North America, Europe, Russia, Chian, and India. Satellite volcanic SO2 data are now used in near real-time for detection of aviation hazards. In 2008 he developed an improved multiangle UV algorithm to derive vertical profile of ozone from ground based Brewer spectrometer data. Since 2010 he serves as PI for the OMI operational NO2 data. He demonstrated the great value that satellite sulfur dioxide and nitrogen dioxide data have in remotely identifying and quantifying point sources of emissions to the atmosphere. He is currently member of NASA Aura. EV-I TEMPO and DSCOVER/EPIC science teams, and disasters response team.

    PRESENT POSITION
    2010- Research Physical Scientist, Atmospheric Chemistry and Dynamics Laboratory, NASA Goddard Space Flight Center

    Dr. Krotkov supervises production and improvements of operational SO2 and NO2 products from EOS Aura/OMI and Suomi NPP/OMPS instruments, performs data analysis of satellite measurements and geophysical research with satellite data, collaborates with NASA Headquarters, universities, other government agencies (USGS, NOAA) and international partners (Environment Canada, ESA, EUMETSAT, FMI, KNMI, BIRA); interprets and quality controls research results; presents findings at national and international meetings; prepares reports, contributes to international assessments and publishes manuscripts in professional journals. He is PI for volcanic SO2 and ash products from NASA’s EPIC UV camera on DSCOVR satellite at Lagrange 1 orbit. He is currently applying his knowledge in retrieval of atmospheric composition for planning of future satellite missions, such as NASA first geostationary air quality TEMPO mission. He retrieves aerosol absorption optical properties using combination of ground based passive radiometers and spectrometers.

    Science Projects

    2016 – PI, NASA ROSES16: “Taking OMI NO2 to the next level: Inferring global fossil fuel CO2 emissions using OMI NO2 Data Improved with Critical Algorithm Updates”
    2016 - Co-I, NASA ROSES16 : “Advancing NASA OMI SO2 product: Enabling new science analyses, applications, and long-term, multi-satellite monitoring”
    2015 – Co-I NASA SIF: “Towards a Database of Volcanic Ash Optical and Chemical Properties to Support Remote Sensing and Modeling for Earth and Planetary Applications”
    2014 – NASA ROSES14 - Participating Investigator in ESA’s Sentinel 5 Precursor mission (TROPOMI)
    2014 – PI, NASA ROSES 14 – DSCOVR science team (EPIC observations of Volcanic SO2 and ash)
    2014 – PI, NASA DISASTERS11stage 2: “Real-time Volcanic Cloud Products for Aviation Alerts”
    2012 – Co-I, NASA EV-I TEMPO ST (NO2, SO2, surface UV algorithms)
    2012 – PI, NASA ROSES2012-MEaSUREs: “Multi-Decadal Sulfur Dioxide Climatology from Satellite Instruments”

    Web pages:

    http://www.researcherid.com/rid/E-1541-2012
    http://so2.gsfc.nasa.gov

    Satellite Instrument team membership

    2015 – ESA S5P (TROPOMI) validation team member
    2014 – NASA DSCOVR (EPIC) science team member
    2012 – NASA EV-I TEMPO science team member
    2011 – NASA GEO-TASO airborne UV/VIS spectrometer science team member
    2011 - NASA GEO-CAPE formulation study science team member
    2001- Aura/OMI science team member and PI responsible for SO2 and NO2 data.
    1995-2006 TOMS ST member, responsible for surface UV algorithm development; volcanic ash and sulfur dioxide data sets.

    Honors Received

    NASA GSFC Performance Awards:2015. 2016

    2013 – NASA EV-I TEMPO science Team award
    2009 – NASA Robert H. Goddard Exceptional Achievement Science awar
    2008 – NASA group achievement award for OMI Instrument team
    2006 – Pecora Award to TOMS team for remote sensing
    2005 – “Aura Project” Group Achievement Award from NASA
    2005 – “Aura Team” Group Achievement Award from the Goddard Space Flight Center
    2002 – “Best paper award” from the International Academic Publishing Company MAIK “Nauka/Interperiodica”, Diploma N46, (Russia)
    1999 – Outstanding Performance in Science Award from the Laboratory for Atmospheres, NASA Goddard Space Flight Center

    Service to community

    2015 – member, scientific committee of ESA’s Living Planet Symposium, Prague 2016
    2014 – Co-Chair AIAA14 meeting on Volcanic Ash effects on Aviation; co-chair CEOS 2014 meeting;
    2011 - Chair, Fall AGU session, Remote sensing of trace gases and aerosols: Air quality applications.
    2005-2008 – UMBC/GEST: Leader: Atmospheric Chemistry focus area. Chair promotional committee.
    2007 – Science organising committee member for International Conference “100 years of UV research”, PMOD, Davos, Switzerland;Contributor/author: Laboratory for Atmospheres annual reports; WMO Ozone assesments;
    Reviewer: JGR, GRL, Atm. Environment, ACP, AMT

    Universities collaborations
    2012 – 2016 adjunct Professor, Physics Departmet, UMBC
    2011 – Eric Hughes, AOSC Univesity of Maryland, College Park; advising Ph. D.
    2010 – Adriana Lima, Physics Department, Univ of Maryland Baltimore County, advising Ph. D.
    2014 - Jungbin Mok, ESSIC, Univesity of Maryland, College Park; advising Ph. D
    2008 – 2010 Can Li, Ph. D. (committee member) Univesity of Maryland, College Park, Department of Atmospheric and Oceanic Sciences;
    2007 - 2008 Brittany McClure, M. S. (committee member) Univesity of Maryland, College Park,

    PRECEDING POSITIONS

    Senior Research Scientist, Goddard Earth Scienes and Technology (GEST) Center ,
    University of Maryland Baltimore County, Oct 2000 – November 2010
    Conducted scientific investigations to improve the understanding of Earth’s troposphere gas species such as sulfur dioxide, ozone and aerosols using remote sensing observations from satellite platforms and ground. His satellite algorithm for mapping surface UV irradiance from TOMS ozone and reflectivity data was adopted by the Finnish Meteorological Institute (FMI) for the Ozone Monitoring Instrument (OMI) production data. He later developed a new algorithm for retrieving sulfur dioxide from volcanoes and anthropogenic pollution, which was adopted as the standard OMI data product. Since 2006 he served as principle investigator for the OMI volcanic and pollution sulfur dioxide products. Dr. Krotkov’s empirical and theoretical analysis of the sulfur dioxide data has led to quantification of passive emissions from active volcanoes and of anthropogenic pollution sources affecting air quality in North America, Europe, Russia, China, and South America. These data are now used in near real-time by NOAA for detection of aviation hazards from volcanic eruption clouds. For this work he was recipient of NASA group achivement awards (2005,2008), 2006 Pecora TOMS team award and the 2009 R.H. Goddard Exceptional Achievement in Science Award. In 2004 he developed a method that led to discovery of enhanced column UV aerosol absorption due to organic aerosol. In part through his work at GSFC absorbing aerosols (black and organic carbon, dust) are now recognized as key to a complete understanding of atmospheric chemistry, for they have large effects on ultraviolet radiation, and on photolysis rates of key pollution gases (ozone and nitrogen dioxide ). In 2008 he developed an improved multiangle ultra-violet algorithm to derive the vertical profile of ozone from ground based Brewer spectrometer data. Supervisor – Prof. Ray Hoff

    Raytheon ITSS Corporation, Lanham, MD, Principal Scientist, July 1996-Oct 2000
    Developed an algorithm for satellite UV volcanic ash retrievals using NASA Total Ozone Mapping Spectrometer (TOMS) instruments. For this work received Outstanding Performance in Science Award from the Laboratory for Atmospheres, NASA Goddard Space Flight Center. Developed applications of TOMS data, such as UV irradiance estimation at the Earth's surface and validated satellite UV retrievals using ground based UV measurements. Authored and co-authored 10 papers. Supervisor- Dr. Charles G. Wellemeyer

    Department of Meteorology, University of Maryland, College Park, MD, Research Associate, Dec 1994 -July 1996 -Developed an improved retrieval algorithm of sulfur dioxide from the NASA TOMS satellite instrument. Performed data analysis of the effect of ozone depletion on ultraviolet (UV) irradiance at the Earth's surface and in the ocean. Performed validation of satellite UV maps with Russian spectral UV radiation data with data from NSF UV Spectroradiometer network in the United States. Authored and co-authored 2 papers. Supervisor- Prof. Robert Hudson.

    Universities Space Research Association at NASA GSFC, Greenbelt, MD, Research Associate and Research Scientist, January 1993 - December 1994 - Analyzed sulfur dioxide data from NASA TOMS instruments. Developed a new computer model simulating propagation of solar UV radiation through the atmosphere-ocean system. Initiated the first intercomparisons of Russian spectral UV radiation data with data from NSF UV Spectroradiometer network in the United States. Supervisor- Dr.Michael W. Kalb

    Central Aerological Observatory, Dolgoprudny, Russia, Research Associate, Sep 1990 – Dec 1992
    Developed radiative transfer models for atmospheric scattering of solar UV radiation. Served as leader of the cooperative project in the framework of Russian State Science Program "Global Changes of Environment and Climate" aimed at the development of scientific approaches to monitoring surface UV radiation changes. Initiated and supervised development of a specialized archiving software package ("UVBase") facilitating analysis and intercomparisons of spectral UV radiation data. Supervisor- Dr. V. Khattatov, CAO Deputy Director

    Moscow Institute of Physics and Technology (MIPT), Dolgoprudny, Russia, GRA, July 1986 – Sep 1990 -Junior Research Fellow (1986-1987) and Graduate Research Assistant (1987-1990) at the Department of Aerophysics and Space Research (Remote Sensing Laboratory). Primary research interests were in theoretical modeling of the polarization effects of the solar radiation in the atmosphere-ocean system, as applied to passive remote sensing of the minor atmospheric gases, aerosols and natural waters. In cooperation with an experimental team, participated in the optical and ecological expeditions in the regions of the Black and Baltic seas. Published 16 papers. Supervisor-Prof. T. V. Kondranin


    PROFESSIONAL MEMBERSHIPS
    American Geophysical Union

    Publications

    Refereed

    Mok, J., N. A. Krotkov, O. Torres, et al. H. Jethva, Z. Li, J. Kim, J.-H. Koo, S. Go, H. Irie, G. Labow, T. F. Eck, B. N. Holben, J. Herman, R. P. Loughman, E. Spinei, S. S. Lee, P. Khatri, and M. Campanelli. 2018. "Comparisons of spectral aerosol single scattering albedo in Seoul, South Korea." Atmospheric Measurement Techniques 11 (4): 2295-2311 [10.5194/amt-11-2295-2018]

    Levelt, P. F., J. Joiner, J. Tamminen, et al. J. P. Veefkind, P. K. Bhartia, D. C. Stein Zweers, B. N. Duncan, D. G. Streets, H. Eskes, R. van der A, C. McLinden, V. Fioletov, S. Carn, J. de Laat, M. DeLand, S. Marchenko, R. McPeters, J. Ziemke, D. Fu, X. Liu, K. Pickering, A. Apituley, G. González Abad, A. Arola, F. Boersma, C. Chan Miller, K. Chance, M. de Graaf, J. Hakkarainen, S. Hassinen, I. Ialongo, Q. Kleipool, N. Krotkov, C. Li, L. Lamsal, P. Newman, C. Nowlan, R. Suleiman, L. G. Tilstra, O. Torres, and K. Wargan. 2018. "The Ozone Monitoring Instrument: overview of 14 years in space." Atmospheric Chemistry and Physics 18 (8): 5699-5745 [10.5194/acp-18-5699-2018]

    Vasilkov, A., E.-S. Yang, S. Marchenko, et al. W. Qin, L. Lamsal, J. Joiner, N. Krotkov, D. Haffner, P. K. Bhartia, and R. Spurr. 2018. "A cloud algorithm based on the O2-O2 477 nm absorption band featuring an advanced spectral fitting method and the use of surface geometry-dependent Lambertian-equivalent reflectivity." Atmospheric Measurement Techniques 11 (7): 4093-4107 [10.5194/amt-11-4093-2018]

    Vasilkov, A., W. Qin, N. Krotkov, et al. L. Lamsal, R. Spurr, D. Haffner, J. Joiner, E.-S. Yang, and S. Marchenko. 2017. "Accounting for the effects of surface BRDF on satellite cloud and trace-gas retrievals: a new approach based on geometry-dependent Lambertian equivalent reflectivity applied to OMI algorithms." Atmospheric Measurement Techniques 10 (1): 333-349 [10.5194/amt-10-333-2017]

    Li, C., N. A. Krotkov, S. Carn, et al. Y. Zhang, R. J. Spurr, and J. Joiner. 2017. "New-generation NASA Aura Ozone Monitoring Instrument (OMI) volcanic SO2 dataset: algorithm description, initial results, and continuation with the Suomi-NPP Ozone Mapping and Profiler Suite (OMPS)." Atmospheric Measurement Techniques 10 (2): 445-458 [10.5194/amt-10-445-2017]

    Lamsal, L. N., S. J. Janz, N. A. Krotkov, et al. K. E. Pickering, R. J. Spurr, M. G. Kowalewski, C. P. Loughner, J. H. Crawford, W. H. Swartz, and J. R. Herman. 2017. "High-resolution NO2 observations from the Airborne Compact Atmospheric Mapper: Retrieval and validation." Journal of Geophysical Research: Atmospheres 122 (3): 1953-1970 [10.1002/2016jd025483]

    Lorente, A., K. Folkert Boersma, H. Yu, et al. S. Dörner, A. Hilboll, A. Richter, M. Liu, L. N. Lamsal, M. Barkley, I. De Smedt, M. Van Roozendael, Y. Wang, T. Wagner, S. Beirle, J.-T. Lin, N. Krotkov, P. Stammes, P. Wang, H. J. Eskes, and M. Krol. 2017. "Structural uncertainty in air mass factor calculation for NO<sub>2</sub> and HCHO satellite retrievals." Atmospheric Measurement Techniques 10 (3): 759-782 [10.5194/amt-10-759-2017]

    Carn, S. A., V. E. Fioletov, C. A. McLinden, C. Li, and N. A. Krotkov. 2017. "A decade of global volcanic SO2 emissions measured from space." Scientific Reports 7 44095 [10.1038/srep44095]

    Zhang, Y., C. Li, N. A. Krotkov, et al. J. Joiner, V. Fioletov, and C. McLinden. 2017. "Continuation of long-term global SO2 pollution monitoring from OMI to OMPS." Atmospheric Measurement Techniques 10 (4): 1495-1509 [10.5194/amt-10-1495-2017]

    Vinnikov, K. Y., R. R. Dickerson, N. A. Krotkov, E. S. Edgerton, and J. J. Schwab. 2017. "The net decay time of anomalies in concentrations of atmospheric pollutants." Atmospheric Environment 160 19-26 [10.1016/j.atmosenv.2017.04.006]

    Miles, G. M., R. Siddans, R. G. Grainger, et al. A. J. Prata, B. Fisher, and N. Krotkov. 2017. "Retrieval of volcanic SO2 from HIRS/2 using optimal estimation." Atmospheric Measurement Techniques 10 (7): 2687-2702 [10.5194/amt-10-2687-2017]

    Krotkov, N. A., L. N. Lamsal, E. A. Celarier, et al. W. H. Swartz, S. V. Marchenko, E. J. Bucsela, K. L. Chan, M. Wenig, and M. Zara. 2017. "The version 3 OMI NO2 standard product." Atmospheric Measurement Techniques 10 (9): 3133-3149 [10.5194/amt-10-3133-2017]

    Fioletov, V., C. A. McLinden, S. K. Kharol, et al. N. A. Krotkov, C. Li, J. Joiner, M. D. Moran, R. Vet, A. J. Visschedijk, and H. A. Denier van der Gon. 2017. "Multi-source SO2 emission retrievals and consistency of satellite and surface measurements with reported emissions." Atmospheric Chemistry and Physics 17 (20): 12597-12616 [10.5194/acp-17-12597-2017]

    McLinden, C. A., V. Fioletov, N. A. Krotkov, et al. C. Li, K. F. Boersma, and C. Adams. 2016. "A Decade of Change in NO2 and SO2 over the Canadian Oil Sands As Seen from Space." Environ. Sci. Technol. 50 (1): 331-337 [10.1021/acs.est.5b04985]

    He, H., K. Y. Vinnikov, C. Li, et al. N. A. Krotkov, A. R. Jongeward, Z. Li, J. W. Stehr, J. C. Hains, and R. R. Dickerson. 2016. "Response of SO2and particulate air pollution to local and regional emission controls: A case study in Maryland." Earth's Future [10.1002/2015ef000330]

    Li, C., N. C. Hsu, A. M. Sayer, et al. N. A. Krotkov, J. S. Fu, L. N. Lamsal, J. Lee, and S.-C. Tsay. 2016. "Satellite observation of pollutant emissions from gas flaring activities near the Arctic." Atmospheric Environment 133 1-11 [10.1016/j.atmosenv.2016.03.019]

    Ge, C., J. Wang, S. Carn, et al. K. Yang, P. Ginoux, and N. Krotkov. 2016. "Satellite-based global volcanic SO2emissions and sulfate direct radiative forcing during 2005-2012." J. Geophys. Res. Atmos. 121 (7): 3446-3464 [10.1002/2015jd023134]

    Krotkov, N. A., C. A. McLinden, C. Li, et al. L. N. Lamsal, E. A. Celarier, S. V. Marchenko, W. H. Swartz, E. J. Bucsela, J. Joiner, B. N. Duncan, K. F. Boersma, J. P. Veefkind, P. F. Levelt, V. E. Fioletov, R. R. Dickerson, H. He, Z. Lu, and D. G. Streets. 2016. "Aura OMI observations of regional SO2 and NO2 pollution changes from 2005 to 2015." Atmos. Chem. Phys. 16 (7): 4605-4629 [10.5194/acp-16-4605-2016]

    Carn, S., and N. Krotkov. 2016. "Ultraviolet Satellite Measurements of Volcanic Ash." Volcanic Ash 217-231 [10.1016/b978-0-08-100405-0.00018-5]

    McLinden, C. A., V. Fioletov, M. W. Shephard, et al. N. Krotkov, C. Li, R. V. Martin, M. D. Moran, and J. Joiner. 2016. "Space-based detection of missing sulfur dioxide sources of global air pollution." Nature Geosci 9 496–500 [10.1038/ngeo2724]

    Zoogman, P., X. Liu, R. Suleiman, et al. W. Pennington, D. Flittner, J. Al-Saadi, B. Hilton, D. Nicks, M. Newchurch, J. Carr, S. Janz, M. Andraschko, A. Arola, B. Baker, B. Canova, C. Chan Miller, R. Cohen, J. Davis, M. Dussault, D. Edwards, J. Fishman, A. Ghulam, G. González Abad, M. Grutter, J. Herman, J. Houck, D. Jacob, J. Joiner, B. Kerridge, J. Kim, N. Krotkov, L. Lamsal, C. Li, A. Lindfors, R. Martin, C. McElroy, C. McLinden, V. Natraj, D. Neil, C. Nowlan, E. O׳Sullivan, P. Palmer, R. Pierce, M. Pippin, A. Saiz-Lopez, R. Spurr, J. Szykman, O. Torres, J. Veefkind, B. Veihelmann, H. Wang, J. Wang, and K. Chance. 2016. "Tropospheric emissions: Monitoring of pollution (TEMPO)." Journal of Quantitative Spectroscopy and Radiative Transfer 186 17-39 [10.1016/j.jqsrt.2016.05.008]

    Pickering, K. E., E. Bucsela, D. Allen, et al. A. Ring, R. Holzworth, and N. Krotkov. 2016. "Estimates of lightning NOx production based on OMI NO2 observations over the Gulf of Mexico." J. Geophys. Res. Atmos. 121 (14): 8668–8691 [10.1002/2015jd024179]

    Adams, C., E. N. Normand, C. A. McLinden, et al. A. E. Bourassa, N. D. Lloyd, D. A. Degenstein, N. A. Krotkov, M. Belmonte Rivas, K. F. Boersma, and H. Eskes. 2016. "Limb–nadir matching using non-coincident NO2 observations: proof of concept and the OMI-minus-OSIRIS prototype product." Atmospheric Measurement Techniques 9 (8): 4103-4122 [10.5194/amt-9-4103-2016]

    Fioletov, V. E., C. A. McLinden, N. Krotkov, et al. C. Li, J. Joiner, N. Theys, S. Carn, and M. D. Moran. 2016. "A global catalogue of large SO2 sources and emissions derived from the Ozone Monitoring Instrument." Atmospheric Chemistry and Physics 16 (18): 11497-11519 [10.5194/acp-16-11497-2016]

    Hughes, E. J., J. Yorks, N. A. Krotkov, A. M. da Silva, and M. McGill. 2016. "Using CATS Near-Realtime Lidar Observations to Monitor and Constrain Volcanic Sulfur Dioxide (SO2) Forecasts." Geophysical Research Letters [10.1002/2016gl070119]

    Ialongo, I., J. Herman, N. Krotkov, et al. L. Lamsal, K. F. Boersma, J. Hovila, and J. Tamminen. 2016. "Comparison of OMI NO2 observations and their seasonal andweekly cycles with ground-based measurements in Helsinki." Atmospheric Measurement Techniques 9 (10): 5203-5212 [10.5194/amt-9-5203-2016]

    Mok, J., N. A. Krotkov, A. Arola, et al. O. Torres, H. Jethva, M. Andrade, G. Labow, T. F. Eck, Z. Li, R. R. Dickerson, G. L. Stenchikov, S. Osipov, and X. Ren. 2016. "Impacts of brown carbon from biomass burning on surface UV and ozone photochemistry in the Amazon Basin." Nature Scientific Reports 6 36940 [10.1038/srep36940]

    Carn, S. A., K. Yang, A. J. Prata, and N. A. Krotkov. 2015. " Extending the long-term record of volcanic SO2 emissions with the Ozone Mapping and Profiler Suite nadir mapper ." Geophysical Research Letters 42 (3): 925-932 [10.1002/2014gl062437]

    Fioletov, V. E., C. A. McLinden, N. A. Krotkov, and C. Li. 2015. " Lifetimes and emissions of SO2 from point sources estimated from OMI ." Geophysical Research Letters 42 (6): 1969-1976 [10.1002/2015gl063148]

    Theys, N., I. De Smedt, J. van Gent, et al. T. Danckaert, T. Wang, F. Hendrick, T. Stavrakou, S. Bauduin, L. Clarisse, C. Li, N. Krotkov, H. Yu, H. Brenot, and M. Van Roozendael. 2015. "Sulfur dioxide vertical column DOAS retrievals from the Ozone Monitoring Instrument: Global observations and comparison to ground-based and satellite data." J. Geophys. Res. Atmos. 120 (6): 2470-2491 [10.1002/2014jd022657]

    Li, C., J. Joiner, N. A. Krotkov, and L. Dunlap. 2015. "A new method for global retrievals of HCHO total columns from the Suomi National Polar-orbiting Partnership Ozone Mapping and Profiler Suite." Geophysical Research Letters 42 (7): 2515-2522 [10.1002/2015gl063204]

    Lamsal, L. N., B. N. Duncan, Y. Yoshida, et al. N. A. Krotkov, K. E. Pickering, D. G. Streets, and Z. Lu. 2015. "U.S. NO2 trends (2005–2013): EPA Air Quality System (AQS) data versus improved observations from the Ozone Monitoring Instrument (OMI)." Atmos. Env. 110 130-143 [10.1016/j.atmosenv.2015.03.055]

    Ialongo, I., J. Hakkarainen, R. Kivi, et al. P. Anttila, N. A. Krotkov, K. Yang, C. Li, S. Tukiainen, S. Hassinen, and J. Tamminen. 2015. "Comparison of operational satellite SO2 products with ground-based observations in northern Finland during the Icelandic Holuhraun fissure eruption." Atmospheric Measurement Techniques 8 (6): 2279-2289 [10.5194/amt-8-2279-2015]

    Marchenko, S., N. A. Krotkov, L. N. Lamsal, et al. E. A. Celarier, W. H. Swartz, and E. J. Bucsela. 2015. "Revising the slant column density retrieval of nitrogen dioxide observed by the Ozone Monitoring Instrument." J. Geophys. Res. Atmos. 120 (11): 5670-5692 [10.1002/2014jd022913]

    Choi, S., J. Joiner, Y. Choi, et al. B. N. Duncan, A. Vasilkov, N. Krotkov, and E. Bucsela. 2014. "First estimates of global free-tropospheric NO2 abundances derived using a cloud-slicing technique applied to satellite observations from the Aura Ozone Monitoring Instrument (OMI)." Atmos. Chem. Phys. 14 (19): 10565-10588 [10.5194/acp-14-10565-2014]

    Buchard, V., A. M. daSilva, P. Colarco, et al. N. A. Krotkov, R. R. Dickerson, J. W. Stehr, G. Mount, E. Spinei, H. L. Arkinson, and H. He. 2014. "GEOS-5 sulfur dioxide simulations during the Frostburg, MD 2010 field campaign." Atmos. Chem. Phys. 14 1929-1941 [10.5194/acp-14-1929-2014]

    Rocha-Lima, A., J. V. Martins, L. A. Remer, et al. N. A. Krotkov, M. H. Tabacniks, Y. Ben-Ami, and P. Artaxo. 2014. "Optical, microphysical and compositional properties of the Eyjafjallajökull volcanic ash." Atmos. Chem. Phys. 14 10,649-10,661 [10.5194/acp-14-10649-2014]

    McLinden, C. A., V. Fioletov, K. F. Boersma, et al. S. K. Kharol, N. A. Krotkov, L. N. Lamsal, P. A. Makar, R. V. Martin, J. P. Veefkind, and K. Yang. 2014. "Improved satellite retrievals of NO2 and SO2 over the Canadian oil sands and comparisons with surface measurements." Atmospheric Chemistry and Physics 14 (7): 3637-3656 [10.5194/acp-14-3637-2014]

    Ialongo, I., J. Hakkarainen, N. Hyttinen, et al. J.-P. Jaklanen, L. Johansson, K. F. Boersma, N. A. Krotkov, and J. Tamminen. 2014. "Characterization of OMI tropospheric NO2 over the Baltic Sea region." Atmos. Chem. Phys. 14 7795-7805 [10.5194/acp-14-7795-2014]

    Duncan, B. N., A. I. Prados, L. Lamsal, et al. Y. Liu, D. Streets, P. Gupta, E. Hilsenrath, R. A. Kahn, J. E. Nielsen, A. Beyersdorf, S. Burton, A. Fiore, J. Fishman, D. Henze, C. Hostetler, N. A. Krotkov, P. Lee, M. Lin, S. Pawson, G. Pfister, K. E. Pickering, R. B. Pierce, Y. Yoshida, and L. Ziemba. 2014. "Satellite data of atmospheric pollution for U.S. air quality applications: Examples of applications, summary of data end-user resources, answers to FAQs, and common mistakes to avoid." Atmospheric Environment 94 647-662 [10.1016/j.atmosenv.2014.05.061]

    Buchard, V. J., A. M. Da Silva, P. R. Colarco, et al. N. A. Krotkov, R. R. Dickerson, J. W. Stehr, G. Mount, E. Spinei, H. L. Arkinson, and H. He. 2014. "Evaluation of GEOS-5 sulfur dioxide simulations during the Frostburg, MD 2010 field campaign." Atmos. Chem. Phys. 14 (4): 1929-1941 [10.5194/acp-14-1929-2014]

    Philip, S., R. V. Martin, J. R. Pierce, et al. J. L. Jimenez, Q. Zhang, M. R. Canagaratna, D. V. Spracklen, C. R. Nowlan, L. N. Lamsal, M. J. Cooper, and N. A. Krotkov. 2014. "Spatially and seasonally resolved estimate of the ratio of organic mass to organic carbon." Atmospheric Environment 87 34-40 [10.1016/j.atmosenv.2013.11.065]

    Flynn, C. M., K. E. Pickering, J. H. Crawford, et al. L. N. Lamsal, N. A. Krotkov, J. R. Herman, A. Weinheimer, G. Chen, X. Liu, J. Szykman, S.-C. Tsay, C. P. Loughner, J. Hains, P. Lee, R. R. Dickerson, J. W. Stehr, and L. Brent. 2014. "Relationship between column-density and surface mixing ratio: Statistical analysis of O3 and NO2 data from the July 2011 Maryland DISCOVER-AQ mission." Atmospheric Environment 92 429-441 [10.1016/j.atmosenv.2014.04.041]

    Nowlan, C. R., R. V. Martin, S. Philip, et al. L. N. Lamsal, N. A. Krotkov, E. A. Marais, S. Wang, and Q. Zhang. 2014. "Global dry deposition of nitrogen dioxide and sulfur dioxide inferred from space-based measurements." Global Biogeochemical Cycles 28 (10): 1025-1043 [10.1002/2014gb004805]

    Lamsal, L. N., N. A. Krotkov, E. A. Celarier, et al. W. H. Swartz, K. E. Pickering, E. J. Bucsela, J. F. Gleason, R. V. Martin, S. Philip, H. Irie, A. M. Cede, J. R. Herman, A. Weinheimer, J. J. Szykman, and T. N. Knepp. 2014. "Evaluation of OMI operational standard NO2 column retrievals using in situ and surface-based NO2 observations." Atmos. Chem. Phys. 14 11,587-11,609 [10.5194/acp-14-11587-2014]

    Streets, D. G., T. Canty, G. R. Carmichael, et al. B. de Foy, R. R. Dickerson, B. N. Duncan, D. P. Edwards, J. A. Haynes, D. K. Henze, M. R. Houyoux, D. J. Jacobi, N. A. Krotkov, L. N. Lamsal, Y. Liu, Z. Lu, R. V. Martini, G. G. Pfister, R. W. Pinder, R. J. Salawitch, and K. J. Wechti. 2013. "Emissions estimation from satellite retrievals: A review of current capability." Atmospheric Environment 77 1011-1042 [10.1016/j.atmosenv.2013.05.051]

    Bucsela, E. J., N. A. Krotkov, L. N. Lamsal, et al. W. H. Swartz, P. K. Bhartia, K. F. Boersma, J. P. Veefkind, J. F. Gleason, and K. E. Pickering. 2013. "A new stratospheric and tropospheric NO2 retrieval algorithm for nadir-viewing satellite instruments: applications to OMI." Atmospheric Measurement Techniques 6 (10): 2607-2626 [10.5194/amt-6-2607-2013]

    Lamsal, L. N., R. V. Martin, D. D. Parrish, and N. A. Krotkov. 2013. "Scaling Relationship for NO2 Pollution and Urban Population Size: A Satellite Perspective." Environmental Science & Technology 47 (14): 7855-7861 [10.1021/es400744g]

    Duncan, B. N., Y. Yoshida, B. de Foy, et al. L. N. Lamsal, D. G. Streets, Z. Lu, K. E. Pickering, and N. A. Krotkov. 2013. "The observed response of Ozone Monitoring Instrument (OMI) NO2 columns to NOx emission controls on power plants in the United States: 2005–2011." Atmospheric Environment 81 102-111 [10.1016/j.atmosenv.2013.08.068]

    Wang, J., S. Park, J. Zeng, et al. C. Ge, K. Yang, S. Carn, N. A. Krotkov, and A. H. Omar. 2013. "Modeling of 2008 Kasatochi volcanic sulfate direct radiative forcing: assimilation of OMI SO₂ plume height data and comparison with MODIS and CALIOP observations." Atmos. Chem. Phys. 13 (4): 1895-1912 [10.5194/acp-13-1895-2013]

    Oetjen, H., S. Baidar, N. A. Krotkov, et al. L. N. Lamsal, M. Lechner, and R. Volkamer. 2013. "Airborne MAX-DOAS measurements over California: Testing the NASA OMI tropospheric NO₂ product." J. Geophys. Res. Atmos. 118 (13): 7400–7413 [10.1002/jgrd.50550]

    Wang, J., S. Park, J. Zeng, et al. C. Ge, K. Yang, S. Carn, N. Krotkov, and A. H. Omar. 2013. "Modeling of 2008 Kasatochi volcanic sulfate direct radiative forcing: assimilation of OMI SO2 plume height data and comparison with MODIS and CALIOP observations." Atmos. Chem. Phys. 13 (4): 1895-1912 [10.5194/acp-13-1895-2013]

    Oetjen, H., S. Baidar, N. A. Krotkov, et al. L. N. Lamsal, M. Lechner, and R. Volkamer. 2013. "Airborne MAX-DOAS measurements over California: Testing the NASA OMI tropospheric NO 2 product." J. Geophys. Res. Atmos. 118 (13): 7400-7413 [10.1002/jgrd.50550]

    Carn, S. A., N. A. Krotkov, K. Yang, and A. J. Krueger. 2013. "Measuring global volcanic degassing with the Ozone Monitoring Instrument (OMI)." Geological Society, London, Special Publications 380 (1): 229-257 [10.1144/sp380.12]

    Fioletov, V. E., C. A. McLinden, N. Krotkov, et al. K. Yang, D. G. Loyola, P. Valks, N. Theys, M. Van Roozendael, C. R. Nowlan, K. Chance, X. Liu, C. Lee, and R. V. Martin. 2013. "Application of OMI, SCIAMACHY, and GOME-2 satellite SO 2 retrievals for detection of large emission sources." J. Geophys. Res. Atmos. 118 (19): 11,399-11,418 [10.1002/jgrd.50826]

    Li, C., J. Joiner, N. A. Krotkov, and P. K. Bhartia. 2013. "A fast and sensitive new satellite SO2 retrieval algorithm based on principal component analysis: Application to the ozone monitoring instrument." Geophysical Research Letters 40 (23): 6314-6318 [10.1002/2013gl058134]

    Lu, Z., D. G. Streets, B. de Foy, and N. A. Krotkov. 2013. "Ozone Monitoring Instrument Observations of Interannual Increases in SO 2 Emissions from Indian Coal-Fired Power Plants during 2005–2012." Environ. Sci. Technol. 47 (24): 13993-14000 [10.1021/es4039648]

    He, H., C. Li, C. P. Loughner, et al. Z. Li, N. A. Krotkov, K. Yang, L. Wang, Y. Zheng, X. Bao, G. Zhao, and R. R. Dickerson. 2012. "SO2 over central China: Measurements, numerical simulations and the tropospheric sulfur budget." J. Geophys. Res. 117 (D16): D00K37 [10.1029/2011JD016473]

    Eck, T. F., B. N. Holben, J. S. Reid, et al. D. M. Giles, M. A. Rivas, R. P. Singh, S. N. Tripathi, C. J. Bruegge, S. E. Platnick, G. T. Arnold, N. A. Krotkov, S. A. Carn, A. Siniuk, O. Dubovik, A. Arola, J. S. Schafer, P. Artaxo, A. Smirnov, H. Chen, and P. Goloub. 2012. "Fog- and cloud-induced aerosol modification observed by the Aerosol Robotic Network (AERONET)." J Geophys Res 117 (D7): D07206 [10.1029/2011JD016839]

    Campbell, J., E. J. Welton, N. A. Krotkov, et al. K. Yang, S. A. Stewart, and M. Fromm. 2012. "Likely seeding of cirrus clouds by stratospheric Kasatochi volcanic aerosol particles near a mid-latitude tropopause fold." Atmospheric Environment 46 441-448 [10.1016/j.atmosenv.2011.09.027]

    Hsu, N.-Y. C., C. Li, N. A. Krotkov, et al. Q. Liang, K. Yang, and S.-C. Tsay. 2012. "Rapid transpacific transport in autumn observed by the A-train satellites." J. Geophys. Res. 117 (D6): D06312 [10.1029/2011JD016626]

    McLinden, C., C. McLinden, V. Fioletov, et al. K. Boersma, N. Krotkov, C. Sioris, J. Veefkind, and K. Yang. 2012. "Air quality over the Canadian oil sands: A first assessment using satellite observations." Geophysical Research Letters 39 (4): L04804 [10.1029/2011GL050273]

    Walter, D., K. Heue, A. Rauthe-Schoch, et al. C. A. Brenninkmeijer, L. Lamsal, N. Krotkov, and U. Platt. 2012. "Flux calculation using CARIBIC DOAS aircraft measurements: SO2 emission of Norilsk." J. Geophys. Res. 117 (D11): D11305 [10.1029/2011JD017335]

    Antón, M., A. Valenzuela, R. Román, et al. H. Lyamani, N. Krotkov, A. Arola, F. J. Olmo, and L. Alados-Arboledas. 2012. "Influence of desert dust intrusions on ground-based and satellite-derived ultraviolet irradiance in southeastern Spain." J. Geophys. Res. 117 (D19): [10.1029/2012jd018056]

    Veefkind, J., K. Boersma, J. Wang, et al. T. Kurosu, N. A. Krotkov, K. Chance, and P. Levelt. 2011. "Global satellite analysis of the relation between aerosols and short-lived trace gases." Atmos. Chem. Phys. 11 (3): 1255-1267 [10.5194/acp-11-1255-2011]

    Lee, C., R. Martin, A. Donkelaar, et al. H. Lee, R. Dickerson, J. Hains, N. A. Krotkov, A. Richter, K. Vinnikov, and J. Schwab. 2011. "SO2 emissions and lifetimes: Estimates from inverse modeling using in situ and global, space-based (SCIAMACHY and OMI) observations." J Geophys Res 116 (D6): D06304 [10.1029/2010JD014758]

    Carn, S. A., K. D. Froyd, B. E. Anderson, et al. P. Wennberg, J. Crounse, K. Spencer, J. E. Dibb, N. A. Krotkov, E. V. Browell, J. W. Hair, G. Diskin, G. Sachse, and S. A. Vay. 2011. "In situ measurements of tropospheric volcanic plumes in Ecuador and Colombia during TC 4." Journal of Geophysical Research 116 D00J24 [10.1029/2010jd014718]

    Fioletov, V. E., C. A. McLinden, N. Krotkov, M. D. Moran, and K. Yang. 2011. "Estimation of SO 2 emissions using OMI retrievals." Geophysical Research Letters 38 (21): [10.1029/2011gl049402]

    Morris, G., W. Komhyr, J. Hirokawa, et al. J. Flynn, N. A. Krotkov, B. Lefer, and F. Ngan. 2010. "A Balloon Sounding Technique for Measuring SO2 Plumes." Journal of Atmospheric and Oceanic Technology 27 (8): 1318-1330 [10.1175/2010JTECHA1436.1]

    Cachorro, V., C. Toledano, M. Anton, et al. A. Berjon, A. Frutos, J. Vilaplana, A. Arola, and N. A. Krotkov. 2010. "Comparison of UV irradiances from Aura/Ozone Monitoring Instrument (OMI) with Brewer measurements at El Arenosillo (Spain) – Part 2: Analysis of site aerosol influence." Atmos. Chem. Phys. 10 (23): 11867-11880 [10.5194/acp-10-11867-2010]

    Krotkov, N. A., M. Schoeberl, G. Morris, S. Carn, and K. Yang. 2010. "Dispersion and lifetime of the SO 2 cloud from the August 2008 Kasatochi eruption." J Geophys Res 115 (D2): D00L20 [10.1029/2010JD013984]

    Li, C., N. A. Krotkov, D. Streets, et al. K. He, S.-C. Tsay, and J. F. Gleason. 2010. "Recent large reduction in sulfur dioxide emissions from Chinese power plants observed by the Ozone Monitoring Instrument." Geophysical Research Letters 37 (8): L08807 [10.1029/2010GL042594]

    Li, C., N. A. Krotkov, R. R. Dickerson, et al. Z. Li, K. Yang, and M. Chin. 2010. "Transport and evolution of a pollution plume from northern China: A satellite-based case study." J Geophys Res 115 (D7): D00K03 [10.1029/2009JD012245]

    Antón, M., V. E. Cachorro, J. M. Vilaplana, et al. C. Toledano, N. A. Krotkov, A. Arola, A. Serrano, and B. de la Morena. 2010. "Comparison of UV irradiances from Aura/Ozone Monitoring Instrument (OMI) with Brewer measurements at El Arenosillo (Spain) – Part 1: Analysis of parameter influence." Atmos. Chem. Phys. 10 (13): 5979-5989 [10.5194/acp-10-5979-2010]

    Xu, M., X.-Z. Liang, W. Gao, and N. Krotkov. 2010. "Comparison of TOMS retrievals and UVMRP measurements of surface spectral UV radiation in the United States." Atmos. Chem. Phys. 10 (18): 8669-8683 [10.5194/acp-10-8669-2010]

    Spinei, E., S. A. Carn, N. A. Krotkov, et al. G. H. Mount, K. Yang, and A. Krueger. 2010. "Validation of ozone monitoring instrument SO 2 measurements in the Okmok volcanic cloud over Pullman, WA, July 2008." Journal of Geophysical Research 115 D00L08 [10.1029/2009jd013492]

    Yang, K., X. Liu, P. K. Bhartia, et al. N. A. Krotkov, S. A. Carn, E. J. Hughes, A. J. Krueger, R. J. Spurr, and S. G. Trahan. 2010. "Direct retrieval of sulfur dioxide amount and altitude from spaceborne hyperspectral UV measurements: Theory and application." Journal of Geophysical Research 115 D00L09 [10.1029/2010jd013982]

    Newman, P., L. Oman, A. R. Douglass, et al. E. L. Fleming, S. M. Frith, M. M. Hurwitz, S. R. Kawa, C. H. Jackman, N. A. Krotkov, E. R. Nash, J. E. Nielsen, S. Pawson, R. S. Stolarski, and G. J. Velders. 2009. "What would have happened to the ozone layer if chlorofluorocarbons (CFCs) had not been regulated?" Atmos. Chem. Phys. 9 (6): 2113-2128 [10.5194/acp-9-2113-2009]

    Corr, C., N. A. Krotkov, S. Madronich, et al. J. Shusser, B. Holben, W. Gao, J. Flynn, B. Lefer, and S. Kreidenweis. 2009. "Retrieval of aerosol single scattering albedo at ultraviolet wavelengths at the T1 site during MILAGRO." Atmos. Chem. Phys. 9 (15): 5813-5827 [10.5194/acp-9-5813-2009]

    De, F., N. A. Krotkov, N. Bei, et al. S. Herndon, L. Huey, A. Martinez, L. Ruiz-Suarez, and L. Molina. 2009. "Hit from both sides: tracking industrial and volcanic plumes in Mexico City with surface measurements and OMI SO₂ retrievals during the MILAGRO field campaign." Atmos. Chem. Phys. 9 (24): 9599-9617 [10.5194/acp-9-9599-2009]

    Kazadzisl, S., A. Bais, A. Arola, et al. N. A. Krotkov, N. Kouremen, and C. Meleti. 2009. "Ozone Monitoring Instrument spectral UV irradiance products: comparison with ground based measurements at an urban environment." Atmos. Chem. Phys. 9 (2): 585-594 [10.5194/acp-9-585-2009]

    Krueger, A., N. A. Krotkov, K. Yang, et al. S. Carn, G. A. Vicente, and W. Schroeder. 2009. "Applications of Satellite-Based Sulfur Dioxide Monitoring." IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing 2 (4): 293-298 [10.1109/JSTARS.2009.2037334]

    Lee, C., V. Martin, A. Donkelaar, et al. G. O'Byrne, N. A. Krotkov, A. Richter, L. Huey, and J. Holloway. 2009. "Retrieval of vertical columns of sulfur dioxide from SCIAMACHY and OMI: Air mass factor algorithm development, validation, and error analysis." J. Geophys. Res. 114 (D22303): [10.1029/2009JD012123]

    Carn, S. A., A. J. Krueger, N. A. Krotkov, K. Yang, and K. D. Evans. 2009. "Tracking volcanic sulfur dioxide clouds for aviation hazard mitigation." Nat Hazards 51 (2): 325-343 [10.1007/s11069-008-9228-4]

    Arola, A., S. Kazadzis, A. Lindfors, et al. N. A. Krotkov, J. Kujanp"a"a, J. Tamminen, A. Bais, A. Sarra, J. Villaplana, C. Brogniez, A. Siam, M. Janouch, P. Weihs, A. Webb, T. Koskela, N. Kouremen, D. Meloni, V. Buchard, F. Auriol, I. Ialongo, M. Staneck, S. Simic, A. Smedley, and S. Kinne. 2009. "A new approach to correct for absorbing aerosols in OMI UV." Geophys Res Lett 36 (22): L22805 [10.1029/2009GL041137]

    Witte, J., M. Schoeberl, A. Douglass, et al. J. Gleason, N. A. Krotkov, J. Gille, K. E. Pickering, and N. Livesey. 2009. "Satellite observations of changes in air quality during the 2008 Beijing Olympics and Paralympics." Geophys Res Lett 36 (17): L17803 [10.1029/2009GL039236]

    Yang, K., P. F. Levelt, P. K. Bhartia, et al. S. A. Carn, A. J. Krueger, and N. A. Krotkov. 2009. "Improving retrieval of volcanic sulfur dioxide from backscattered UV satellite observations." Geophysical Research Letters 36 (3): L03102 [10.1029/2008GL036036]

    Yang, K., N. A. Krotkov, A. J. Krueger, and S. A. Carn. 2009. "Estimating the altitude of volcanic sulfur dioxide plumes from space borne hyper-spectral UV measurements." Geophys Res Lett 36 (L10803): [10.1029/2009GL038025]

    de Foy, B., N. A. Krotkov, N. Bei, et al. S. C. Herndon, L. G. Huey, A.-P. Martínez, L. G. Ruiz-Suárez, E. C. Wood, M. Zavala, and L. T. Molina. 2009. "Hit from both sides: tracking industrial and volcanic plumes in Mexico City with surface measurements and OMI SO2 retrievals during the MILAGRO field campaign." Atmos. Chem. Phys. 9 (24): 9599-9617 [10.5194/acp-9-9599-2009]

    Krueger, A., N. Krotkov, S. Carn, and C. El. 2008. "El Chichon: The genesis of volcanic sulfur dioxide monitoring from space." J Volcanol Geotherm Res 175 (4): 408-414 [10.1016/j.jvolgeores.2008.02.026]

    Tzortziou, M. A., N. A. Krotkov, A. M. Cede, J. R. Herman, and A. P. Vasilkov. 2008. "A new technique for retrieval of tropospheric and stratospheric ozone profiles using sky radiance measurements at multiple view angles: Application to a Brewer spectrometer." Journal of Geophysical Research – Atmospheres 113 (D6): D06304 [10.1029/2007JD009093]

    Krotkov, N. A., B. McClure, R. R. Dickerson, et al. S. A. Carn, C. Li, P. K. Bhartia, K. Yang, A. J. Krueger, Z. Li, P. F. Levelt, H. Chen, P. Wang, and D. Lu. 2008. "Validation of SO2 retrievals from the Ozone Monitoring Instrument over NE China." J Geophys Res 113 (D16S40, doi:101029/):

    Hassinen, S., J. Tamminen, A. Tanskanen, et al. G. Leppelmeier, A. Mälkki, T. Koskela, J. M. Karhu, K. Lakkala, P. Veefkind, N. Krotkov, and O. Aulamo. 2008. "Description and validation of the OMI very fast delivery products." J Geophys Res 113 (D16S35): [10.1029/2007JD008784]

    Carn, S., A. Krueger, S. Arellano, N. Krotkov, and K. Yang. 2008. "Daily monitoring of Ecuadorian volcanic degassing from space." Journal of Volcanology and Geothermal Research 176 (1): 141-150 [10.1016/j.jvolgeores.2008.01.029]

    Carn, S., N. Krotkov, K. Yang, et al. R. Hoff, A. Prata, A. Krueger, S. Loughlin, and P. Levelt. 2007. "Extended observations of volcanic SO2 and sulfate aerosol in the stratosphere." Atmos Chem Phys Discuss 7 2857-2871

    Carn, S., A. Krueger, N. Krotkov, K. Yang, and P. Levelt. 2007. "Sulfur dioxide emissions from Peruvian copper smelters detected by the Ozone Monitoring Instrument." Geophy Res Lett 34 L09801

    Anton, M., V. Cachorro, J. Vilaplana, et al. N. Krotkov, A. Serrano, C. Toledano, B. de la Morena, and J. Herman. 2007. "Total ozone mapping spectrometer retrievals of noon erythermal-CIE ultraviolet irradiance compared with Brewer ground-based measurements at E1 Arenosillo (southwestern Spain)." J Geopohys Res 112 D11206

    Antón, M., V. E. Cachorro, J. M. Vilaplana, et al. N. A. Krotkov, A. Serrano, C. Toledano, B. de la Morena, and J. R. Herman. 2007. "Total ozone mapping spectrometer retrievals of noon erythemal-CIE ultraviolet irradiance compared with Brewer ground-based measurements at El Arenosillo (southwestern Spain)." Journal of Geophysical Research 112 (D11): D11206 [10.1029/2006jd007254]

    Yang, K., N. A. Krotkov, A. J. Krueger, et al. S. A. Carn, P. K. Bhartia, and P. F. Levelt. 2007. "Retrieval of large volcanic SO 2 columns from the Aura Ozone Monitoring Instrument: Comparison and limitations." Journal of Geophysical Research 112 (D24): D24S43 [10.1029/2007jd008825]

    Tanskanen, A., A. Lindfors, A. Määttä, et al. N. Krotkov, J. Herman, J. Kaurola, T. Koskela, K. Lakkala, V. Fioletov, G. Bernhard, R. McKenzie, Y. Kondo, M. O'Neill, H. Slaper, P. den Outer, A. F. Bais, and J. Tamminen. 2007. "Validation of daily erythemal doses from Ozone Monitoring Instrument with ground-based UV measurement data." Journal of Geophysical Research 112 (D24): D24S44 [10.1029/2007jd008830]

    Dickerson, R. R., C. Li, Z. Li, et al. L. T. Marufu, J. W. Stehr, B. McClure, N. Krotkov, H. Chen, P. Wang, X. Xia, X. Ban, F. Gong, J. Yuan, and J. Yang. 2007. "Aircraft observations of dust and pollutants over northeast China: Insight into the meteorological mechanisms of transport." Journal of Geophysical Research 112 (D24): D24S90 [10.1029/2007jd008999]

    Cede, A., J. Herman, A. Richter, N. Krotkov, and J. Burrows. 2006. "Measurements of nitrogen dioxide total column amounts using a Brewer double spectrophotometer in direct Sun mode." Journal of Geophysical Research 111 (D5): D05304 [10.1029/2005jd006585]

    Cede, A., J. Herman, A. Richter, N. Krotkov, and J. Burrows. 2006. "Measurements of Nitrogen Dioxide Total Column Amounts Using a Brewer Spectrometer in Direct Sun Mode." J Geophys Res 111 D05304

    Belanger, S., W. Vincent, P. Larouche, et al. N. Krotkov, H. Xie, and M. Babin. 2006. "Photomineralization of terrigenous dissolved organic matter in Arctic coastal waters from 1979 to 2003: Interannual variability and implications of climate change." Global Biogeochem Cycles 20 GB4005

    Tanskanen, A., N. Krotkov, J. Herman, and A. Arola. 2006. "Surface Ultraviolet Irradiance from OMI." IEEE Trans on Geosc And Remote Sensing 44 (5): IGRSD2 1267-1271

    Tanskanen, A., N. Krotkov, J. Herman, and A. Arola. 2006. "Surface ultraviolet irradiance from OMI." IEEE Transactions on Geoscience and Remote Sensing 44 (5): 1267-1271 [10.1109/tgrs.2005.862203]

    Krotkov, N. A., S. Carn, A. J. Krueger, P. K. Bhartia, and K. Yang. 2006. "Band Residual Difference Algorithm for Retrieval of SO2 from the Aura Ozone Monitoring Instrument (OMI)." IEEE Transactions on Geoscience and Remote Sensing 44 (5): 1259-1266 [10.1109/TGRS.2005.861932]

    Kazantzidis, A., A. Bais, J. Gröbner, et al. J. R. Herman, S. Kazadzis, N. A. Krotkov, E. Kyrö, P. N. den Outer, K. Garane, P. Görts, K. Lakkala, C. Meleti, H. Slaper, R. Tax, T. Turunen, and C. Zerefos. 2006. "Comparison of satellite-derived UV irradiances with ground-based measurements at four European stations." J Geophys Res 111 D13207 [10.1029/2005JD006672]

    Krotkov, N. A., P. K. Bhartia, J. R. Herman, et al. J. Slusser, G. Scott, G. J. Labow, A. P. Vasilkov, T. F. Eck, O. Dubovik, and B. N. Holben. 2005. "Aerosol ultraviolet absorption experiment (2002 to 2004), part 2: absorption optical thickness, refractive index, and single scattering albedo." Opt Eng 44 (4): 041005-1 - 041005-17 [10.1117/1.1886819]

    Arola, A., S. Kazadzis, N. Krotkov, et al. A. Bias, J. Herman, and K. Lakkala. 2005. "Assessment of TOMS UV bias due to absorbing aerosols." J. Geophys. Res. 110 (D23): D23211 [10.1029/2005JD005913]

    Krotkov, N. A., P. K. Bhartia, J. R. Herman, et al. J. Slusser, G. J. Labow, G. Scott, G. Janson, T. F. Eck, and B. N. Holben. 2005. "Aerosol ultraviolet absorption experiment (2002 to 2004), part 1: ultraviolet multifilter rotating shadowband radiometer calibration and intercomparison with CIMEL sunphotometers." Opt Eng 44 (4): 041004-1 - 041004-17 [10.1117/1.1886818]

    Carn, S. A., A. J. Krueger, N. A. Krotkov, and M. A. Gray. 2004. "Fire at Iraqi sulfur plant emits SO2 clouds detected by Earth Probe TOMS." Geophys. Res. Lett. 31 (L19105): 10.1029/2004GL020719

    Ahmad, Z., P. Bhartia, and N. Krotkov. 2004. "Spectral properties of backscattered UV radiation in cloudy atmospheres." J. Geophys. Res. 109 (D1): D01201 [10.1029/2003JD003395]

    Fioletov, V. E., M. G. Kimlin, N. Krotkov, et al. L. J. McArthur, J. B. Kerr, D. I. Wardle, J. R. Herman, R. Meltzer, T. W. Mathews, and J. Kaurola. 2004. "UV index climatology over the United States and Canada from ground-based and satellite estimates." J. Geophys. Res. 109 (D22): [10.1029/2004jd004820]

    Bais, A. F., S. Madronich, J. Crawford, et al. S. R. Hall, B. Mayer, M. van Weele, J. Lenoble, J. G. Calvert, C. A. Cantrell, R. E. Shetter, A. Hofzumahaus, P. Koepke, P. S. Monks, G. Frost, R. McKenzie, N. Krotkov, A. Kylling, W. H. Swartz, S. Lloyd, G. Pfister, T. J. Martin, E.-P. Roeth, E. Griffioen, A. Ruggaber, M. Krol, A. Kraus, G. D. Edwards, M. Mueller, B. L. Lefer, P. Johnston, H. Schwander, D. Flittner, B. G. Gardiner, J. Barrick, and R. Schmitt. 2003. "International Photolysis Frequency Measurement and Model Intercomparison (IPMMI): Spectral actinic solar flux measurements and modeling." J. Geophys. Res. 108 (D16): 8543 [doi:10.1029/2002JD002891]

    Arola, A., J. Kaurola, L. Koskinen, et al. A. Tanskanen, T. Tikkanen, P. Taalas, J. R. Herman, N. Krotkov, and V. Fioletov. 2003. " A new approach to estimating the albedo for snow-covered surfaces in the satellite UV method." J. Geophys. Res. 108 (D17): 4531 [doi:10.1029/2003JD003492]

    Carn, S. A., A. J. Krueger, G. J. Bluth, et al. S. J. Schaefer, N. A. Krotkov, I. M. Watson, and S. Datta. 2003. "Volcanic eruption detection by the Total Ozone Mapping Spectrometer (TOMS) instruments: a 22-year record of sulphur dioxide and ash emissions." Geological Society, London, Special Publications 213 (1): 177-202 [10.1144/gsl.sp.2003.213.01.11]

    Krotkov, N. A., J. R. Herman, P. K. Bhartia, et al. C. Seftor, A. Arola, J. Kaurola, L. Koskinen, S. Kalliskota, P. Taalas, and I. Geogdzhaev. 2002. "Version 2 TOMS UV algorithm: problems and enhancements." Opt. Eng. 41 (12): 3028-3039 [doi: 10.1117/1.1519541]

    Krotkov, N., J. Herman, P. K. Bhartia, et al. C. Seftor, A. Arola, J. Kaurola, S. Kalliskota, P. Taalas, and I. V. Geogdzhayev. 2002. "Version 2 total ozone mapping spectrometer ultraviolet algorithm: problems and enhancements." Optical Engineering 41 (12): 3028-3039 [10.1117/1.1519541]

    Vasilkov, A., J. Herman, N. Krotkov, et al. M. Kahru, B. Mitchell, and N. Hsu. 2002. "Problems in assessment of the UV penetration into natural waters from space-based measurements." Optical Engineering 41 3019-3027

    Masserot, D., J. Lenoble, C. Brogniez, et al. M. Houet, N. Krotkov, and R. McPeters. 2002. "Retrieval of ozone column from global irradiance measurements and comparison with TOMS data. A year of data in the Alps." Geophysical Research Letters 29 (9): 23-1-23-4 [10.1029/2002gl014823]

    Krotkov, N. A., O. Torres, C. Seftor, et al. A. Krueger, A. B. Kostinski, W. Rose, G. Bluth, D. Schneider, and S. Schaefer. 1999. "Comparison of TOMS and AVHRR Volcanic Ash Retrievals from the August 1992 Eruption of Mt Spurr." Geophys Res Lett 26 (4): 455-458 [10.1029/1998GL900278]

    Seftor, C. J., N.-Y. C. Hsu, J. R. Herman, et al. P. K. Bhartia, O. Torres, W. Rose, D. Schneider, and N. Krotkov. 1997. "Detection of volcanic ash clouds from Nimbus-7/Total Ozone Mapping Spectrometer." J. Geophys. Res. 102 (D14): 16749-16760 [10.1029/97JD00925]

                                                                                                                                                                                            
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