Dr. Hiren T Jethva

Dr. Hiren T Jethva

  • Senior Research Scientist
  • 301.614.5225
  • NASA/GSFC
  • Mail Code: 614
  • Greenbelt , MD 20771
  • Employer: MORGAN STATE UNIV.
  • Brief Bio

    Dr. Jethva has spent more than a decade in learning, developing, and validating the satellite-based aerosol retrieval from different sensors on board NASA’s EOS satellites. His Ph.D. thesis investigation (2008) was focused on analyzing aerosol patterns using ground and satellite measurements and suggesting improvements to the NASA’s Moderate Resolution Imaging Spectroradiometer (MODIS) operational aerosol retrieval over the Indian region. During his postdoctoral fellowship (2009-2011) at the Hampton University, Hampton, VA, USA, he evaluated the Ozone Monitoring Instrument (OMI) operational aerosol products and provided critical suggestions towards improving the algorithm. Since 2011 and under the NASA/USRA’s GESTAR program, and now with Morgan State University as a senior research scientist under GESTAR-II, he is responsible to upkeep, maintain, and validate the OMI aerosol product as well as develop innovative algorithms for characterizing aerosols above clouds. He has played a lead role in developing the near-UV and visible-based techniques for the quantitative retrieval of the above-cloud aerosols from OMI, MODISDSCOVR-EPIC, and S5p-TropOMI observations.

    Research Interests

    Remote Sensing of Atmospheric Aerosols and Clouds

    Radiative Transfer in Atmosphere

    Cloud-Aerosols Interactions

    Above-cloud Aerosols

    Biomass burning and air quality

    Current Projects

    Aura/OMI and S5p-TROPOMI Aerosol Science Project

    Hourly global Aerosol Index and aerosol particle properties using EPIC observations

    MEaSUREs Aerosol Project

    TEMPO Aerosol Group

    Comprehensive characterization of absorbing aerosols above clouds from the synergy of CALIOP-OMI-MODIS

    Positions/Employment

    12/2021 - Present

    Senior Research Scientist under UMBC-MSU-NASA GSFC Cooperative Agreement GESTAR-II

    Morgan State University, NASA Goddard Space Flight Center Job Responsibilities
    • Re-visiting the current status of the operational OMI two-channel aerosol algorithm
    • Refine the current aerosol models and surface parameterization assumed in the algorithm
    • Generate look-up-tables for the OMI operational aerosol retrievals
    • Validation of the operational OMI aerosol product
    • Developed a new innovative technique to detect as well as quantitatively derive aerosols optial depth and spectral aerosol absorption for above-cloud aerosols scenes from OMI observations
    • Develop a global OMI opertational algorithm for above-cloud aerosol retrieval
    • Perform an analysis on the availability and quality of aerosol retrieval from from future sensors TEMPO and GEO-CAPE using MODIS observations
    10/2011 - 11/2021

    Research Scientist (Earth Sciences)

    Universities Space Research Association, NASA Goddard Space Flight Center
    1/2009 - 9/2011

    Post-doctoral Fellow

    Dept. Atmospheric & Planetary Sciences Hampton University , Hampton, VA, USA

    Education

    Indian Institute of Science, Bangalore, India July 2008
    Ph.D. in Atmospheric Science
    Thesis Title: “An Investigation on Role of Surface Reflectance and Aerosol
    Model in Remote Sensing of Aerosols from Moderate-Resolution Imaging
    Spectroradiometer over India”
    Thesis Advisors: Prof. J. Srinivasan & Prof. S. K. Satheesh
    Indian Institute of Science, Bangalore, India July 2003

    M.Sc. (Engg.) in Atmospheric Science
    Thesis Title: “Comparison of Microwave Radiative Transfer Models
    and Retrieval of Humidity from Satellite Microwave Data”
    Thesis Advisor: Prof. J. Srinivasan

    Sardar Patel University, V. V. Nagar, Gujarat, India August 1999
    Bachelor of Engineering (B. E.) in Mechanical Engineering

    Awards

    Best Senior Author Publication award conferred by NASA for the outstanding work in the development of a remote sensing approach to retrieve optical depth of aerosols above clouds using MODIS visible observations.

    Best Science Highlight award conferred by NASA for the April 2017 Science Highlights titled as "A Global Decadal Record of Optical Depth of Absorbing Aerosols above Clouds from OMI's Near-UV Observations"

    Professional Service

    Dr. Jethva, alongwith Drs. Omar Torres and Eric Wilcox, organized a session entitled "Aerosols above Clouds" during 2013 AGU Fall Meeting held in San Francisco in December 2013.

    Grants

    2019 Aura Science Team, NASA

    A one-and-half decade long global characterization of absorbing aerosols over clouds and sea-ice/snow using a synergy of Atrain sensors OMI, CALIOP, MODIS, and CERES


    ; Principal Investigator

    Selected Publications

    Refereed

    Gautam, R., P. N. Patel, M. K. Singh, et al. T. Liu, L. J. Mickley, H. Jethva, and R. S. DeFries. 2023. "Extreme Smog Challenge of India Intensified by Increasing Lower Tropospheric Stability." Geophysical Research Letters, 50 (11): [10.1029/2023gl103105]

    Jethva, H. 2022. "Assessing predictability of post-monsoon crop residue fires in Northwestern India." Frontiers in Earth Science, 10: [10.3389/feart.2022.1047278]

    Jethva, H., D. P. Haffner, P. K. Bhartia, and O. Torres. 2022. "Estimating Spectral Effects of Absorbing Aerosols on Backscattered UV Radiation." Earth and Space Science, 9 (12): [10.1029/2022ea002354]

    Kayetha, V., O. Torres, and H. Jethva. 2022. "Retrieval of UV–visible aerosol absorption using AERONET and OMI–MODIS synergy: spatial and temporal variability across major aerosol environments." Atmospheric Measurement Techniques, 15 (4): 845-877 [10.5194/amt-15-845-2022]

    Ahn, C., O. Torres, H. Jethva, R. Tiruchirapalli, and L. Huang. 2021. "Evaluation of Aerosol Properties Observed by DSCOVR/EPIC Instrument From the Earth‐Sun Lagrange 1 Orbit." Journal of Geophysical Research: Atmospheres, 126 (12): [10.1029/2020jd033651]

    Schutgens, N., O. Dubovik, O. Hasekamp, et al. O. Torres, H. Jethva, P. J. Leonard, P. Litvinov, J. Redemann, Y. Shinozuka, G. de Leeuw, S. Kinne, T. Popp, M. Schulz, and P. Stier. 2021. "AEROCOM and AEROSAT AAOD and SSA study – Part 1: Evaluation and intercomparison of satellite measurements." Atmospheric Chemistry and Physics, 21 (9): 6895-6917 [10.5194/acp-21-6895-2021]

    Lyapustin, A., S. Go, S. Korkin, et al. Y. Wang, O. Torres, H. Jethva, and A. Marshak. 2021. "Retrievals of Aerosol Optical Depth and Spectral Absorption From DSCOVR EPIC." Frontiers in Remote Sensing, 2: [10.3389/frsen.2021.645794]

    Gatebe, C. K., H. Jethva, R. Gautam, R. Poudyal, and T. Várnai. 2021. "A new measurement approach for validating satellite-based above-cloud aerosol optical depth." Atmospheric Measurement Techniques, 14 (2): 1405-1423 [10.5194/amt-14-1405-2021]

    Torres, O., H. Jethva, C. Ahn, G. Jaross, and D. G. Loyola. 2020. "TROPOMI aerosol products: evaluation and observations of synoptic-scale carbonaceous aerosol plumes during 2018–2020." Atmospheric Measurement Techniques, 13 (12): 6789-6806 [10.5194/amt-13-6789-2020]

    Schutgens, N., A. M. Sayer, A. Heckel, et al. C. Hsu, H. Jethva, G. de Leeuw, P. J. Leonard, R. C. Levy, A. Lipponen, A. Lyapustin, P. North, T. Popp, C. Poulsen, V. Sawyer, L. Sogacheva, G. Thomas, O. Torres, Y. Wang, S. Kinne, M. Schulz, and P. Stier. 2020. "An AeroCom–AeroSat study: intercomparison of satellite AOD datasets for aerosol model evaluation." Atmospheric Chemistry and Physics, 20 (21): 12431-12457 (In Press) [10.5194/acp-20-12431-2020]

    Torres, O., P. Bhartia, G. Taha, et al. H. Jethva, S. Das, P. Colarco, N. Krotkov, A. Omar, and C. Ahn. 2020. "Stratospheric Injection of Massive Smoke Plume from Canadian Boreal Fires in 2017 as seen by DSCOVR‐EPIC, CALIOP and OMPS‐LP Observations." Journal of Geophysical Research: Atmospheres, [10.1029/2020jd032579]

    Sogacheva, L., T. Popp, A. M. Sayer, et al. O. Dubovik, M. J. Garay, A. Heckel, N. C. Hsu, H. Jethva, R. A. Kahn, P. Kolmonen, M. Kosmale, G. de Leeuw, R. C. Levy, P. Litvinov, A. Lyapustin, P. North, O. Torres, and A. Arola. 2020. "Merging regional and global aerosol optical depth records from major available satellite products." Atmospheric Chemistry and Physics, 20 (4): 2031-2056 [10.5194/acp-20-2031-2020]

    Jethva, H., O. Torres, R. D. Field, et al. A. Lyapustin, R. Gautam, and V. Kayetha. 2019. "Connecting Crop Productivity, Residue Fires, and Air Quality over Northern India." Scientific Reports, 9 (1): 16594 [Full Text (Link)] [10.1038/s41598-019-52799-x]

    Jethva, H., O. Torres, and Y. Yoshida. 2019. "Accuracy assessment of MODIS land aerosol optical thickness algorithms using AERONET measurements over North America." Atmospheric Measurement Techniques, 12 (8): 4291-4307 [10.5194/amt-12-4291-2019]

    Mallet, M., P. Nabat, P. Zuidema, et al. J. Redemann, A. M. Sayer, M. Stengel, S. Schmidt, S. Cochrane, S. Burton, R. Ferrare, K. Meyer, P. Saide, H. Jethva, O. Torres, R. Wood, D. Saint Martin, R. Roehrig, C. Hsu, and P. Formenti. 2019. "Simulation of the transport, vertical distribution, optical properties and radiative impact of smoke aerosols with the ALADIN regional climate model during the ORACLES-2016 and LASIC experiments." Atmospheric Chemistry and Physics, 19 (7): 4963-4990 [10.5194/acp-19-4963-2019]

    Liao, J., T. F. Hanisco, G. M. Wolfe, et al. J. M. St Clair, J. L. Jimenez, P. Campuzano-Jost, B. A. Nault, A. Fried, E. A. Marais, G. Gonzalez Abad, K. Chance, H. T. Jethva, T. B. Ryerson, C. Warneke, and A. Wisthaler. 2019. "Towards a satellite formaldehyde – in situ hybrid estimate for organic aerosol abundance." Atmospheric Chemistry and Physics, 19 (5): 2765-2785 [10.5194/acp-19-2765-2019]

    Jethva, H., O. Torres, and C. Ahn. 2018. "A 12-year long global record of optical depth of absorbing aerosols above the clouds derived from the OMI/OMACA algorithm." Atmospheric Measurement Techniques, 11 (10): 5837-5864 [10.5194/amt-11-5837-2018]

    Torres, O., P. K. Bhartia, H. Jethva, and C. Ahn. 2018. "Impact of the ozone monitoring instrument row anomaly on the long-term record of aerosol products." Atmospheric Measurement Techniques, 11 (5): 2701-2715 [10.5194/amt-11-2701-2018]

    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]

    Jethva, H., D. Chand, O. Torres, et al. P. Gupta, A. Lyapustin, and F. Patadia. 2018. "Agricultural Burning and Air Quality over Northern India: A Synergistic Analysis using NASA’s A-train Satellite Data and Ground Measurements." Aerosol and Air Quality Research, 18 (7): 1756-1773 [10.4209/aaqr.2017.12.0583]

    Mallet, M., F. Solmon, L. Roblou, et al. F. Peers, S. Turquety, F. Waquet, H. Jethva, and O. Torres. 2017. "Simulation of Optical Properties and Direct and Indirect Radiative Effects of Smoke Aerosols Over Marine Stratocumulus Clouds During Summer 2008 in California With the Regional Climate Model RegCM." Journal of Geophysical Research: Atmospheres, 122 (19): 10,312-10,337 [10.1002/2017jd026905]

    Zhang, L., D. K. Henze, G. A. Grell, et al. O. Torres, H. Jethva, and L. N. Lamsal. 2017. "What factors control the trend of increasing AAOD over the United States in the last decade?" Journal of Geophysical Research: Atmospheres, 122 (3): 1797-1810 [10.1002/2016jd025472]

    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]

    Jethva, H., O. Torres, L. Remer, et al. J. Redemann, J. Livingston, S. Dunagan, Y. Shinozuka, M. Kacenelenbogen, M. S. Rosenheimer, and R. Spurr. 2016. "Validating MODIS above-cloud aerosol optical depth retrieved from “color ratio” algorithm using direct measurements made by NASA's airborne AATS and 4STAR sensors." Atmospheric Measurement Techniques, 9 (10): 5053-5062 [10.5194/amt-9-5053-2016]

    Field, R. D., G. R. van der Werf, T. Fanin, et al. E. J. Fetzer, R. Fuller, H. Jethva, R. Levy, N. J. Livesey, M. Luo, O. Torres, and H. M. Worden. 2016. "Indonesian fire activity and smoke pollution in 2015 show persistent nonlinear sensitivity to El Niño-induced drought." Proc Natl Acad Sci USA, 113 (33): 9204-9209 [10.1073/pnas.1524888113]

    Knobelspiesse, K., B. Cairns, H. T. Jethva, et al. M. Kacenelenbogen, M. Segal-Rosenheimer, and O. Torres. 2014. "Remote sensing of above cloud aerosols." Light Scattering Reviews, 9: 167-210, ISBN: 978-3-642-37984-0 (Print) 978-3-642-37985-7 (Online).

    Jethva, H. T., O. Torres, and C. Ahn. 2014. "Global assessment of OMI aerosol single-scattering albedo using ground-based AERONET inversion." J. Geophys. Res. Atmos., 119 (14): 9020-9040 [10.1002/2014JD021672]

    Ahn, C., O. Torres, and H. T. Jethva. 2014. "Assessment of OMI near-UV aerosol optical depth over land." J. Geophys. Res. Atmos., 119 (5): 2457–2473 [10.1002/2013JD020188]

    Jethva, H. T., O. Torres, F. Waquet, D. Chand, and Y. and Hu. 2014. "How do A-train sensors intercompare in the retrieval of above-cloud aerosol optical depth? A case study-based assessment." Geophys. Res. Lett., 41 (1): 186–192 [10.1002/2013GL058405]

    Jethva, H. T., O. Torres, L. Remer, and P. K. and Bhartia. 2013. "A color ratio method for simultaneous retrieval of aerosol and cloud optical thickness of above-cloud absorbing aerosols from passive sensors: Application to MODIS measurements." IEEE Transactions on Geoscience and Remote Sensing, Vol 51 (7): 3862 - 3870 [10.1109/TGRS.2012.2230008]

    Eck, T. F., B. N. Holben, J. S. Reid, et al. M. M. Mukelabai, S. J. Piketh, O. Torres, H. T. Jethva, E. J. Hyer, D. E. Ward, O. Dubovik, A. Sinyuk, J. Schafer, D. M. Giles, M. G. Sorokin, A. Smirnov, and I. Slutsker. 2013. "A seasonal trend of single scattering albedo in southern African biomass-burning particles: Implications for satellite products and estimates of emissions for the world's largest biomass-burning source." J. Geophys. Res. Atmos., 118 (12): 6414-6432 [10.1002/jgrd.50500]

    Torres, O., H. T. Jethva, and P. K. Bhartia. 2012. "Retrieval of Aerosol Optical Depth above Clouds from OMI Observations: Sensitivity Analysis and Case Studies." Journal of the Atmospheric Sciences, 69 (3): 1037-1053 [10.1175/JAS-D-11-0130.1]

    Jethva, H. T., and O. Torres. 2011. "Satellite-based evidence of wavelength-dependent aerosol absorption in biomass burning smoke inferred from Ozone Monitoring Instrument." Atmos. Chem. Phys., 11 (20): 10541-10551 [10.5194/acp-11-10541-2011]

    Jethva, H. T., S. Satheesh, J. Srinivasan, and R. C. Levy. 2010. "Improved retrieval of aerosol size-resolved properties from moderate resolution imaging spectroradiometer over India: Role of aerosol model and surface reflectance." Journal of Geophysical Research-Atmosphere, 115 (D18213): [10.1029/2009JD013218]

    Torres, O., Z. Chen, H. T. Jethva, et al. C. Ahn, S. Freitas, and P. K. Bhartia. 2010. "OMI and MODIS observations of the anomalous 2008–2009 Southern Hemisphere biomass burning seasons." Atmos. Chem. Phys., 10 (8): 3505-3513 [10.5194/acp-10-3505-2010]

    Jethva, H. T., S. Satheesh, J. Srinivasan, and K. Krishnamoorthy. 2009. "How Good is the Assumption about Visible Surface Reflectance in MODIS Aerosol Retrieval over Land? A Comparison with Aircraft Measurements over an Urban Site in India." IEEE Trans. Geosci. Rem. Sens., 47 (7): [10.1109/TGRS.2008.2010221]

    Jethva, H. T., S. Satheesh, and J. Srinivasan. 2007. "Evaluation of Moderate-Resolution Imaging Spectroradiometer (MODIS) Collection 004 (C004) Aerosol Retrievals at Kanpur, Indo-Gangetic Basin,." J. Geophys. Res, 112 (D14216): [10.1029/2006JD007929]

    Jethva, H. T., S. Satheesh, and J. Srinivasan. 2007. "Assessment of Second-generation MODIS Aerosol Retrieval (Collection 005) at Kanpur, India." Geophys. Res. Lett., 34 (L19802): [10.1029/2007GL029647]

    Jethva, H. T., S. Satheesh, and J. Srinivasan. 2006. "Systematic Bias in MODIS Aerosol Retrieval at Kanpur (AERONET), Indo-Gangetic Basin." Proc. SPIE 6408, Remote Sensing of the Atmosphere and Clouds, 6408: [10.1117/12.694952]

    Jethva, H. T., S. Satheesh, and J. Srinivasan. 2005. "Seasonal Variability of Aerosols over The Indo-Gangetic Basin." J. Geophy. Res, 110 (D21204): [10.1029/2005JD005938]

    Jethva, H. T., and J. Srinivasan. 2004. "Role of Variations in Vertical Profiles of Relative Humidity on the Retrieval of Humidity from AMSU-B Data." Geophys. Res. Lett, 31 (L23109): [10.1029/2004GL021098]

    Non-Refereed

    Jethva, H. T., O. Torres, and C. Ahn. 2016. "A ten-year global record of absorbing aerosols above clouds from OMI's near-UV observations." Remote Sensing of the Atmosphere, Clouds, and Precipitation VI [10.1117/12.2225765]

    Jethva, H. T. 2015. "Interactive comment on “Investigating the frequency and trends in global above-cloud aerosol characteristics with CALIOP and OMI” by R. Alfaro-Contreras et al." Atmos. Chem. Phys. Discuss. 15: C1488-C1496.

    Selected Public Outreach

    Hazardous Pre-Monsoon Dust Pollution 6 / 2018 - 6 / 2018
    https://earthobservatory.nasa.gov/IOTD/view.php?id=92309

    An Image of The Day (IOTD) article about pre-monsoon dust storm over northern India.

    NASA data shows no reduction in crop fires, 2016 worst year 12 / 2017 - 12 / 2017

    Complete URL: https://timesofindia.indiatimes.com/city/delhi/nasa-data-shows-no-reduction-in-crop-fires-2016-worst-year/articleshow/62090411.cms

    Using Satellites to Size Up the Severity of Crop Fires in Northern India 2 / 2017 - 2 / 2017

    Complete URL: https://earthobservatory.nasa.gov/blogs/earthmatters/2017/02/08/the-crop-residue-fires-in-northern-india-were-the-most-severe-in-more-than-a-decade/

    Crop fires in Punjab and Pak. fuelled Delhi pollution 11 / 2016 - 11 / 2016

    Complete URL: http://www.thehindu.com/news/cities/Delhi/crop-fires-in-punjab-and-pak-fuelled-delhi-pollution/article9321762.ece

    Studying Smoke Above the Clouds 5 / 2016 - 5 / 2016
    http://earthobservatory.nasa.gov/IOTD/view.php?id=88013&src=iotdrss
    Haze in the Kashmir Valley 12 / 2014 - 12 / 2014
    http://earthobservatory.nasa.gov/NaturalHazards/view.php?id=84862
    Seasons of Indian Air Quality 11 / 2014 - 11 / 2014
    http://earthobservatory.nasa.gov/IOTD/view.php?id=84731
    Smoke Above the Clouds 10 / 2014 - 10 / 2014
    http://earthobservatory.nasa.gov/IOTD/view.php?id=84557
    Smoke Goes Around the World 7 / 2015 - 7 / Present
    http://earthobservatory.nasa.gov/IOTD/view.php?id=86241

    Talks, Presentations and Posters

    Invited

    Connecting Crop Productivity, Residue Burning, and Air Quality over Northern India

    3 / 15 / 2019

    March 2019

    Workshop on Confronting Air Pollution at its Source

    A project sponsored by the North India Office, U.S. Embassy in New Delhi.

    Organized by RTI International and U. S. Embassy in New Delhi

    Other

    A 12-year Global Record of Above-cloud Aerosol Optical Depth Retrieved from OMI

    9 / 2017

    2017 OMI Science Team Meeting
    NASA Goddard, Greenbelt, MD, USA
    Sep 2017
     

    Evaluation of visible AOD retrievals over the North America using MODIS algorithms 

    9 / 2017

    TEMPO Aerosol Workshop

    College Park, MD USA

    Sep 2017

    A Global, Decadal, and Quantitative Record of Absorbing Aerosols above Cloud Derived Using OMI’s Near-UV Observations in Conjunction with NASA’s A-train Sensors

    4 / 2017

    A-train Symposium

    Pasadena, CA, USA

    Apr 2017

    A Global, Decadal, and Quantitative Record of Absorbing Aerosols above Cloud from OMI’s Near-UV Observations 

    12 / 2016

    2016 Fall Meeting of AGU

    San Francisco, CA, USA

    Dec 2016

    A ten-year global record of absorbing aerosols above clouds from OMI's near-UV observations 

    6 / 2016

    2016 Yoram Kaufman Symposium

    NASA Goddard, Greenbelt, MD, USA

    June 2016

    A ten-year global record of absorbing aerosols above clouds from OMI's near-UV observations

    4 / 2016

    10th SPIE Asia-Pacific Remote Sensing Symposium

    New Delhi, India

    Apr 2016

    Ten-Year Global Record of Aerosol Optical Depth Above Cloud from OMI Observations

    8 / 2015

    EOS Aura-OMI Science Team Meeting

    De Bilt, The Netherlands

    Aug 2015

    Validating Above-cloud Aerosol Optical Depth Retrieved from MODIS using NASA Ames Airborne Sun Tracking Photometric and Spectrometric (AATS and 4STAR) Measurements 

    12 / 2014

    2014 Fall Meeting of AGU

    San Francisco, CA USA

    Dec 2014

    Retrieval, Inter-comparison, and Validation of Above-cloud Aerosol Optical Depth from A-train Sensors 

    10 / 2014

    13th AEROCOM Workshop

    Steamboat Springs, CO USA

    Oct 2014

    Global Assessment of OMI Aerosol Single-scattering Albedo Using Ground-based AERONET and SKYNET Inversions

    9 / 2014

    EOS Aura Science Team Meeting

    NASA Goddard, Greenbelt, MD USA

    Sep 2014

    9-year Record of OMI Aerosol Observations

    6 / 2014

    2014 AEROCENTER Annual Update

    NASA Goddard, Greenbelt, MD USA

    June 2014

    How do A-train Sensors Inter-Compare in the Retrieval of Above-Cloud Aerosol Optical Depth? A Case Study based Assessment 

    12 / 2013

    2013 Fall Meeting of American Geophysical Union

    San Francisco, CA USA

    Dec 2013

    Above-cloud Absorbing Aerosols: Global Frequency of Occurrence from OMI Observations and A-train Inter-sensor Comparison of Above-cloud Aerosol Optical Depth 

    5 / 2013

    2013 AEROCENTER Annual Update

    NASA Goddard, Greenbelt, MD USA

    May 2013

    Absorbing Aerosols Above Cloud: Detection, Quantitative Retrieval, and Radiative Forcing from Satellite-based Passive Sensors 

    12 / 2012

    2012 Fall Meeting of American Geophysical Union

    San Francisco, CA USA

    Dec 2012

    Characterizing Aerosols above Cloud using Satellite-based UV and Visible Measurements 

    10 / 2012

    EOS Aura Science Team Meeting

    Pasadena, CA USA

    Oct 2012

    Comparative Analysis of OMI/OMAERUV and AERONET Retrieval of Single-scattering Albedo in Dust and Biomass burning Environments

    12 / 2011

    2011 Fall Meeting of American Geophysical Union

    San Francisco, CA USA

    Dec 2011

    Retrieving Aerosol Optical Depth above Clouds using OMI Observations 

    7 / 2011

    Gordon Research Conference

    Colby College, ME, USA

    July 2011

    Satellite-based Evidence of Wavelength-dependent Aerosol Absorption in Biomass Burning Smoke inferred from OMI 

    7 / 2010

    2010 Asia-Oceania Geoscience Society

    Hyderabad, India

    July 2010

    Evidence of the presence of Organics in Biomass Burning Aerosols over South America through Inter-comparison of OMI-AERONET Data 

    12 / 2009

    2009 Fall Meeting of American Geophysical Union 

    San Francisco, CA USA

    Dec 2009

    Near-UV Remote Sensing of Spectral Aerosol Absorption using OMI Measurements 

    8 / 2009

    NASA ACE Decadal Survey Meeting 

    Santa Fe, NM USA

    Aug 2009

    Role of Aerosol Model and Surface Reflectance in MODIS Aerosol Retrieval at Kanpur, India 

    11 / 2007

    Aerosol-Chemistry-Climate Interactions Symposium

    Ahmedabad, India

    Nov 2007

    Systematic bias in MODIS dust aerosol retrieval at Kanpur (AERONET), Indo-Gangetic Basin 

    6 / 2006

    5th SPIE Asia-Pacific Remote Sensing Symposium

    Goa, India

    June 2006

    Seasonal Variability of Aerosols over the Indo-Gangetic Basin

    6 / 2005

    2nd Asia-Oceania Geoscience Society Annual Meeting

    Singapore

    June 2005

    Retrieval of Relative Humidity from AMSU-B Data 

    6 / 2004

    India-US Space Conference

    Bengaluru, India

    June 2004

    Brief Bio

    Dr. Jethva has spent more than a decade in learning, developing, and validating the satellite-based aerosol retrieval from different sensors on board NASA’s EOS satellites. His Ph.D. thesis investigation (2008) was focused on analyzing aerosol patterns using ground and satellite measurements and suggesting improvements to the NASA’s Moderate Resolution Imaging Spectroradiometer (MODIS) operational aerosol retrieval over the Indian region. During his postdoctoral fellowship (2009-2011) at the Hampton University, Hampton, VA, USA, he evaluated the Ozone Monitoring Instrument (OMI) operational aerosol products and provided critical suggestions towards improving the algorithm. Since 2011 and under the NASA/USRA’s GESTAR program, and now with Morgan State University as a senior research scientist under GESTAR-II, he is responsible to upkeep, maintain, and validate the OMI aerosol product as well as develop innovative algorithms for characterizing aerosols above clouds. He has played a lead role in developing the near-UV and visible-based techniques for the quantitative retrieval of the above-cloud aerosols from OMI, MODISDSCOVR-EPIC, and S5p-TropOMI observations.

    Selected Publications

    Refereed

    Gautam, R., P. N. Patel, M. K. Singh, et al. T. Liu, L. J. Mickley, H. Jethva, and R. S. DeFries. 2023. "Extreme Smog Challenge of India Intensified by Increasing Lower Tropospheric Stability." Geophysical Research Letters 50 (11): [10.1029/2023gl103105]

    Jethva, H. 2022. "Assessing predictability of post-monsoon crop residue fires in Northwestern India." Frontiers in Earth Science 10 [10.3389/feart.2022.1047278]

    Jethva, H., D. P. Haffner, P. K. Bhartia, and O. Torres. 2022. "Estimating Spectral Effects of Absorbing Aerosols on Backscattered UV Radiation." Earth and Space Science 9 (12): [10.1029/2022ea002354]

    Kayetha, V., O. Torres, and H. Jethva. 2022. "Retrieval of UV–visible aerosol absorption using AERONET and OMI–MODIS synergy: spatial and temporal variability across major aerosol environments." Atmospheric Measurement Techniques 15 (4): 845-877 [10.5194/amt-15-845-2022]

    Ahn, C., O. Torres, H. Jethva, R. Tiruchirapalli, and L. Huang. 2021. "Evaluation of Aerosol Properties Observed by DSCOVR/EPIC Instrument From the Earth‐Sun Lagrange 1 Orbit." Journal of Geophysical Research: Atmospheres 126 (12): [10.1029/2020jd033651]

    Schutgens, N., O. Dubovik, O. Hasekamp, et al. O. Torres, H. Jethva, P. J. Leonard, P. Litvinov, J. Redemann, Y. Shinozuka, G. de Leeuw, S. Kinne, T. Popp, M. Schulz, and P. Stier. 2021. "AEROCOM and AEROSAT AAOD and SSA study – Part 1: Evaluation and intercomparison of satellite measurements." Atmospheric Chemistry and Physics 21 (9): 6895-6917 [10.5194/acp-21-6895-2021]

    Lyapustin, A., S. Go, S. Korkin, et al. Y. Wang, O. Torres, H. Jethva, and A. Marshak. 2021. "Retrievals of Aerosol Optical Depth and Spectral Absorption From DSCOVR EPIC." Frontiers in Remote Sensing 2 [10.3389/frsen.2021.645794]

    Gatebe, C. K., H. Jethva, R. Gautam, R. Poudyal, and T. Várnai. 2021. "A new measurement approach for validating satellite-based above-cloud aerosol optical depth." Atmospheric Measurement Techniques 14 (2): 1405-1423 [10.5194/amt-14-1405-2021]

    Torres, O., H. Jethva, C. Ahn, G. Jaross, and D. G. Loyola. 2020. "TROPOMI aerosol products: evaluation and observations of synoptic-scale carbonaceous aerosol plumes during 2018–2020." Atmospheric Measurement Techniques 13 (12): 6789-6806 [10.5194/amt-13-6789-2020]

    Schutgens, N., A. M. Sayer, A. Heckel, et al. C. Hsu, H. Jethva, G. de Leeuw, P. J. Leonard, R. C. Levy, A. Lipponen, A. Lyapustin, P. North, T. Popp, C. Poulsen, V. Sawyer, L. Sogacheva, G. Thomas, O. Torres, Y. Wang, S. Kinne, M. Schulz, and P. Stier. 2020. "An AeroCom–AeroSat study: intercomparison of satellite AOD datasets for aerosol model evaluation." Atmospheric Chemistry and Physics (In Press) 20 (21): 12431-12457 [10.5194/acp-20-12431-2020]

    Torres, O., P. Bhartia, G. Taha, et al. H. Jethva, S. Das, P. Colarco, N. Krotkov, A. Omar, and C. Ahn. 2020. "Stratospheric Injection of Massive Smoke Plume from Canadian Boreal Fires in 2017 as seen by DSCOVR‐EPIC, CALIOP and OMPS‐LP Observations." Journal of Geophysical Research: Atmospheres [10.1029/2020jd032579]

    Sogacheva, L., T. Popp, A. M. Sayer, et al. O. Dubovik, M. J. Garay, A. Heckel, N. C. Hsu, H. Jethva, R. A. Kahn, P. Kolmonen, M. Kosmale, G. de Leeuw, R. C. Levy, P. Litvinov, A. Lyapustin, P. North, O. Torres, and A. Arola. 2020. "Merging regional and global aerosol optical depth records from major available satellite products." Atmospheric Chemistry and Physics 20 (4): 2031-2056 [10.5194/acp-20-2031-2020]

    Jethva, H., O. Torres, R. D. Field, et al. A. Lyapustin, R. Gautam, and V. Kayetha. 2019. "Connecting Crop Productivity, Residue Fires, and Air Quality over Northern India." Scientific Reports 9 (1): 16594 [Full Text (Link)] [10.1038/s41598-019-52799-x]

    Jethva, H., O. Torres, and Y. Yoshida. 2019. "Accuracy assessment of MODIS land aerosol optical thickness algorithms using AERONET measurements over North America." Atmospheric Measurement Techniques 12 (8): 4291-4307 [10.5194/amt-12-4291-2019]

    Mallet, M., P. Nabat, P. Zuidema, et al. J. Redemann, A. M. Sayer, M. Stengel, S. Schmidt, S. Cochrane, S. Burton, R. Ferrare, K. Meyer, P. Saide, H. Jethva, O. Torres, R. Wood, D. Saint Martin, R. Roehrig, C. Hsu, and P. Formenti. 2019. "Simulation of the transport, vertical distribution, optical properties and radiative impact of smoke aerosols with the ALADIN regional climate model during the ORACLES-2016 and LASIC experiments." Atmospheric Chemistry and Physics 19 (7): 4963-4990 [10.5194/acp-19-4963-2019]

    Liao, J., T. F. Hanisco, G. M. Wolfe, et al. J. M. St Clair, J. L. Jimenez, P. Campuzano-Jost, B. A. Nault, A. Fried, E. A. Marais, G. Gonzalez Abad, K. Chance, H. T. Jethva, T. B. Ryerson, C. Warneke, and A. Wisthaler. 2019. "Towards a satellite formaldehyde – in situ hybrid estimate for organic aerosol abundance." Atmospheric Chemistry and Physics 19 (5): 2765-2785 [10.5194/acp-19-2765-2019]

    Jethva, H., O. Torres, and C. Ahn. 2018. "A 12-year long global record of optical depth of absorbing aerosols above the clouds derived from the OMI/OMACA algorithm." Atmospheric Measurement Techniques 11 (10): 5837-5864 [10.5194/amt-11-5837-2018]

    Torres, O., P. K. Bhartia, H. Jethva, and C. Ahn. 2018. "Impact of the ozone monitoring instrument row anomaly on the long-term record of aerosol products." Atmospheric Measurement Techniques 11 (5): 2701-2715 [10.5194/amt-11-2701-2018]

    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]

    Jethva, H., D. Chand, O. Torres, et al. P. Gupta, A. Lyapustin, and F. Patadia. 2018. "Agricultural Burning and Air Quality over Northern India: A Synergistic Analysis using NASA’s A-train Satellite Data and Ground Measurements." Aerosol and Air Quality Research 18 (7): 1756-1773 [10.4209/aaqr.2017.12.0583]

    Mallet, M., F. Solmon, L. Roblou, et al. F. Peers, S. Turquety, F. Waquet, H. Jethva, and O. Torres. 2017. "Simulation of Optical Properties and Direct and Indirect Radiative Effects of Smoke Aerosols Over Marine Stratocumulus Clouds During Summer 2008 in California With the Regional Climate Model RegCM." Journal of Geophysical Research: Atmospheres 122 (19): 10,312-10,337 [10.1002/2017jd026905]

    Zhang, L., D. K. Henze, G. A. Grell, et al. O. Torres, H. Jethva, and L. N. Lamsal. 2017. "What factors control the trend of increasing AAOD over the United States in the last decade?" Journal of Geophysical Research: Atmospheres 122 (3): 1797-1810 [10.1002/2016jd025472]

    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]

    Jethva, H., O. Torres, L. Remer, et al. J. Redemann, J. Livingston, S. Dunagan, Y. Shinozuka, M. Kacenelenbogen, M. S. Rosenheimer, and R. Spurr. 2016. "Validating MODIS above-cloud aerosol optical depth retrieved from “color ratio” algorithm using direct measurements made by NASA's airborne AATS and 4STAR sensors." Atmospheric Measurement Techniques 9 (10): 5053-5062 [10.5194/amt-9-5053-2016]

    Field, R. D., G. R. van der Werf, T. Fanin, et al. E. J. Fetzer, R. Fuller, H. Jethva, R. Levy, N. J. Livesey, M. Luo, O. Torres, and H. M. Worden. 2016. "Indonesian fire activity and smoke pollution in 2015 show persistent nonlinear sensitivity to El Niño-induced drought." Proc Natl Acad Sci USA 113 (33): 9204-9209 [10.1073/pnas.1524888113]

    Knobelspiesse, K., B. Cairns, H. T. Jethva, et al. M. Kacenelenbogen, M. Segal-Rosenheimer, and O. Torres. 2014. "Remote sensing of above cloud aerosols." Light Scattering Reviews 9 167-210

    Jethva, H. T., O. Torres, and C. Ahn. 2014. "Global assessment of OMI aerosol single-scattering albedo using ground-based AERONET inversion." J. Geophys. Res. Atmos. 119 (14): 9020-9040 [10.1002/2014JD021672]

    Ahn, C., O. Torres, and H. T. Jethva. 2014. "Assessment of OMI near-UV aerosol optical depth over land." J. Geophys. Res. Atmos. 119 (5): 2457–2473 [10.1002/2013JD020188]

    Jethva, H. T., O. Torres, F. Waquet, D. Chand, and Y. and Hu. 2014. "How do A-train sensors intercompare in the retrieval of above-cloud aerosol optical depth? A case study-based assessment." Geophys. Res. Lett. 41 (1): 186–192 [10.1002/2013GL058405]

    Jethva, H. T., O. Torres, L. Remer, and P. K. and Bhartia. 2013. "A color ratio method for simultaneous retrieval of aerosol and cloud optical thickness of above-cloud absorbing aerosols from passive sensors: Application to MODIS measurements." IEEE Transactions on Geoscience and Remote Sensing Vol 51 (7): 3862 - 3870 [10.1109/TGRS.2012.2230008]

    Eck, T. F., B. N. Holben, J. S. Reid, et al. M. M. Mukelabai, S. J. Piketh, O. Torres, H. T. Jethva, E. J. Hyer, D. E. Ward, O. Dubovik, A. Sinyuk, J. Schafer, D. M. Giles, M. G. Sorokin, A. Smirnov, and I. Slutsker. 2013. "A seasonal trend of single scattering albedo in southern African biomass-burning particles: Implications for satellite products and estimates of emissions for the world's largest biomass-burning source." J. Geophys. Res. Atmos. 118 (12): 6414-6432 [10.1002/jgrd.50500]

    Torres, O., H. T. Jethva, and P. K. Bhartia. 2012. "Retrieval of Aerosol Optical Depth above Clouds from OMI Observations: Sensitivity Analysis and Case Studies." Journal of the Atmospheric Sciences 69 (3): 1037-1053 [10.1175/JAS-D-11-0130.1]

    Jethva, H. T., and O. Torres. 2011. "Satellite-based evidence of wavelength-dependent aerosol absorption in biomass burning smoke inferred from Ozone Monitoring Instrument." Atmos. Chem. Phys. 11 (20): 10541-10551 [10.5194/acp-11-10541-2011]

    Jethva, H. T., S. Satheesh, J. Srinivasan, and R. C. Levy. 2010. "Improved retrieval of aerosol size-resolved properties from moderate resolution imaging spectroradiometer over India: Role of aerosol model and surface reflectance." Journal of Geophysical Research-Atmosphere 115 (D18213): [10.1029/2009JD013218]

    Torres, O., Z. Chen, H. T. Jethva, et al. C. Ahn, S. Freitas, and P. K. Bhartia. 2010. "OMI and MODIS observations of the anomalous 2008–2009 Southern Hemisphere biomass burning seasons." Atmos. Chem. Phys. 10 (8): 3505-3513 [10.5194/acp-10-3505-2010]

    Jethva, H. T., S. Satheesh, J. Srinivasan, and K. Krishnamoorthy. 2009. "How Good is the Assumption about Visible Surface Reflectance in MODIS Aerosol Retrieval over Land? A Comparison with Aircraft Measurements over an Urban Site in India." IEEE Trans. Geosci. Rem. Sens. 47 (7): [10.1109/TGRS.2008.2010221]

    Jethva, H. T., S. Satheesh, and J. Srinivasan. 2007. "Evaluation of Moderate-Resolution Imaging Spectroradiometer (MODIS) Collection 004 (C004) Aerosol Retrievals at Kanpur, Indo-Gangetic Basin,." J. Geophys. Res 112 (D14216): [10.1029/2006JD007929]

    Jethva, H. T., S. Satheesh, and J. Srinivasan. 2007. "Assessment of Second-generation MODIS Aerosol Retrieval (Collection 005) at Kanpur, India." Geophys. Res. Lett. 34 (L19802): [10.1029/2007GL029647]

    Jethva, H. T., S. Satheesh, and J. Srinivasan. 2006. "Systematic Bias in MODIS Aerosol Retrieval at Kanpur (AERONET), Indo-Gangetic Basin." Proc. SPIE 6408, Remote Sensing of the Atmosphere and Clouds 6408 [10.1117/12.694952]

    Jethva, H. T., S. Satheesh, and J. Srinivasan. 2005. "Seasonal Variability of Aerosols over The Indo-Gangetic Basin." J. Geophy. Res 110 (D21204): [10.1029/2005JD005938]

    Jethva, H. T., and J. Srinivasan. 2004. "Role of Variations in Vertical Profiles of Relative Humidity on the Retrieval of Humidity from AMSU-B Data." Geophys. Res. Lett 31 (L23109): [10.1029/2004GL021098]

    Non-Refereed

    Jethva, H. T., O. Torres, and C. Ahn. 2016. "A ten-year global record of absorbing aerosols above clouds from OMI's near-UV observations." Remote Sensing of the Atmosphere, Clouds, and Precipitation VI [10.1117/12.2225765]

    Jethva, H. T. 2015. "Interactive comment on “Investigating the frequency and trends in global above-cloud aerosol characteristics with CALIOP and OMI” by R. Alfaro-Contreras et al." Atmos. Chem. Phys. Discuss. 15 C1488-C1496

                                                                                                                                                                                            
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