Sciences and Exploration Directorate

Alexander Marshak

((AST, CLIMATE & RADIATION STUDIES))

Alexander Marshak's Contact Card & Information.
Email: alexander.marshak-1@nasa.gov
Phone: 301.614.6122
Org Code: 613
Address:
NASA/GSFC
Mail Code 613
Greenbelt, MD 20771
Employer:
NASA

Missions & Projects

Brief Bio


Alexander Marshak received the M.S. degree in applied mathematics from Tartu University, Estonia, in 1978 and the Ph.D. degree in numerical analysis from the Academy of Sciences of the USSR, Novosibirsk, Russia, in 1983. In 1978, he joined the Institute of Astrophysics and Atmospheric Physics in Estonia, where he worked for 11 years. In 1989, he received an Alexander von Humboldt fellowship and worked for two years with Göttingen University, Germany. In 1991, he joined GSFC, first working for SSAI, then UMBC/JCET, and finally, NASA/GSFC, where he has been since January 2003.


Dr. A. Marshak conducts research on remote sensing of clouds, aerosols and blowing snow, on cloud-aerosol interaction, and on many aspects of atmospheric radiative transfer. He is the Deputy Project Scientist for the Deep Space Climate Observatory (DSCOVR) satellite mission, and a member of the CALIPSO and MODIS Science Teams, and the International Radiation Commission.


Dr. Marshak has published over 200 refereed papers, books, and chapters in edited volumes. Web of Science publications and citation metrics can be found here; see also Google Scholar.

Education


M.S. in Applied Mathematics (1978) from Tartu State University, Estonia
Ph.D. in Numerical Analysis (1983) from the Computer Center of the Academy of Sciences of the USSR, Novosibirsk, Russia

Publications


Refereed

2024. "A new spectrally-invariant approach to the remote sensing of inhomogeneous clouds." Frontiers in Remote Sensing 5 [10.3389/frsen.2024.1392596] [Journal Article/Letter]

2024. "Impacts of Sun Glint Off Ice Clouds on DSCOVR EPIC Cloud Products." IEEE Transactions on Geoscience and Remote Sensing 62 1-11 [10.1109/tgrs.2024.3400253] [Journal Article/Letter]

2023. "Effect of scattering angle on DSCOVR/EPIC observations." Frontiers in Remote Sensing 4 [10.3389/frsen.2023.1188056] [Journal Article/Letter]

2023. "Earth observations from the Moon's surface: dependence on lunar libration." Atmospheric Measurement Techniques 16 (6): 1527-1537 [10.5194/amt-16-1527-2023] [Journal Article/Letter]

2023. "DSCOVR: Monitoring Earth’s Climate and the Threat of the Sun’s Weather." Scientia [10.33548/scientia876] [Journal Article/Letter]

2022. "Markovian Statistical Model of Cloud Optical Thickness. Part I: Theory and Examples." Journal of the Atmospheric Sciences 79 (12): 3315-3332 [10.1175/jas-d-22-0125.1] [Journal Article/Letter]

2022. "Near‐Cloud Aerosol Retrieval Using Machine Learning Techniques, and Implied Direct Radiative Effects." Geophysical Research Letters 49 (20): [10.1029/2022gl098274] [Journal Article/Letter]

2022. "Reduction of Spectral Radiance Reflectance During the Annular Solar Eclipse of 21 June 2020 Observed by EPIC." Frontiers in Remote Sensing 3 [10.3389/frsen.2022.777314] [Journal Article/Letter]

2022. "Unique Observational Constraints on the Seasonal and Longitudinal Variability of the Earth’s Planetary Albedo and Cloud Distribution Inferred From EPIC Measurements." Frontiers in Remote Sensing 2 [10.3389/frsen.2021.788525] [Journal Article/Letter]

2022. "EPIC/DSCOVR as a Pathfinder in Cloud Remote Sensing Using Differential Oxygen Absorption Spectroscopy." Frontiers in Remote Sensing 3 [10.3389/frsen.2022.796273] [Journal Article/Letter]

2022. "Unique NISTAR-Based Climate GCM Diagnostics of the Earth’s Planetary Albedo and Spectral Absorption Through Longitudinal Data Slicing." Frontiers in Remote Sensing 3 [10.3389/frsen.2022.766917] [Journal Article/Letter]

2022. "Cloud Height Daytime Variability From DSCOVR/EPIC and GOES-R/ABI Observations." Frontiers in Remote Sensing 3 [10.3389/frsen.2022.780243] [Journal Article/Letter]

2022. "EarthShine: Observing our world as an exoplanet from the surface of the Moon." Journal of Astronomical Telescopes, Instruments, and Systems 8 (01): 014003 [10.1117/1.jatis.8.1.014003] [Journal Article/Letter]

2021. "Operational Detection of Sun Glints in DSCOVR EPIC Images." Frontiers in Remote Sensing 2 [10.3389/frsen.2021.777806] [Journal Article/Letter]

2021. "Lagrange Point Missions: The Key to next Generation Integrated Earth Observations. DSCOVR Innovation." Frontiers in Remote Sensing 2 [10.3389/frsen.2021.745938] [Journal Article/Letter]

2021. "Atmospheric Correction of DSCOVR EPIC: Version 2 MAIAC Algorithm." Frontiers in Remote Sensing 2 [10.3389/frsen.2021.748362] [Journal Article/Letter]

2021. "Earth Imaging From the Surface of the Moon With a DSCOVR/EPIC-Type Camera." Frontiers in Remote Sensing 2 [10.3389/frsen.2021.724074] [Journal Article/Letter]

2021. "Effect of Scattering Angle on Earth Reflectance." Frontiers in Remote Sensing 2 [10.3389/frsen.2021.719610] [Journal Article/Letter]

2021. "Aerosol properties in cloudy environments from remote sensing observations: a review of the current state of knowledge." Bulletin of the American Meteorological Society 1-57 [10.1175/bams-d-20-0225.1] [Journal Article/Letter]

2021. "Calibration of the DSCOVR EPIC Visible and NIR Channels using Multiple LEO Radiometers." Frontiers in Remote Sensing 2 [10.3389/frsen.2021.671933] [Journal Article/Letter]

2021. "Retrievals of Aerosol Optical Depth and Spectral Absorption From DSCOVR EPIC." Frontiers in Remote Sensing 2 [10.3389/frsen.2021.645794] [Journal Article/Letter]

2021. "Precipitable Water Vapor Variation in the Clear-Cloud Transition Zone From the ARM Shortwave Spectrometer." IEEE Geoscience and Remote Sensing Letters 1-5 [10.1109/lgrs.2021.3064334] [Journal Article/Letter]

2021. "Analysis of Near-Cloud Changes in Atmospheric Aerosols Using Satellite Observations and Global Model Simulations." Remote Sensing 13 (6): 1151 [10.3390/rs13061151] [Journal Article/Letter]

2021. "The Shortwave Spectral Radiometer for Atmospheric Science: Capabilities and Applications from the ARM User Facility." Bulletin of the American Meteorological Society 102 (3): E539-E554 [10.1175/bams-d-19-0227.1] [Journal Article/Letter]

2021. "Deep Space Observations of Terrestrial Glitter." Earth and Space Science 8 (2): 2020EA001521 [10.1029/2020ea001521] [Journal Article/Letter]

2021. "Global daytime variability of clouds from DSCOVR/EPIC observations." Geophysical Research Letters 48 [10.1029/2020gl091511] [Journal Article/Letter]

2020. "Deep Space Observations of Cloud Glints: Spectral and Seasonal Dependence." IEEE Geoscience and Remote Sensing Letters 1-5 [10.1109/lgrs.2020.3040144] [Journal Article/Letter]

2020. "Cloud-top pressure retrieval with DSCOVR EPIC oxygen A- and B-band observations." Atmospheric Measurement Techniques 13 (10): 5259-5275 [10.5194/amt-13-5259-2020] [Journal Article/Letter]

2020. "Changes in the surface broadband shortwave radiation budget during the 2017 eclipse." Atmospheric Chemistry and Physics 20 (17): 10477-10491 [10.5194/acp-20-10477-2020] [Journal Article/Letter]

2020. "Daytime Variability of Cloud Fraction From DSCOVR/EPIC Observations." Journal of Geophysical Research: Atmospheres 125 (10): [10.1029/2019jd031488] [Journal Article/Letter]

2020. "Analyzing changes in the complexity of climate in the last four decades using MERRA-2 radiation data." Scientific Reports 10 (1): 922 [10.1038/s41598-020-57917-8] [Journal Article/Letter]

2019. "Spectral Signature of the Biosphere: NISTAR Finds It in Our Solar System From the Lagrangian L‐1 Point." Geophysical Research Letters 46 (17-18): 10679-10686 [10.1029/2019gl083736] [Journal Article/Letter]

2019. "Deep Space Observations of Sun Glints from Marine Ice Clouds." IEEE Geoscience and Remote Sensing Letters 17 1-5 [10.1109/lgrs.2019.2930866] [Journal Article/Letter]

2019. "Cloud Edge Properties Measured by the ARM Shortwave Spectrometer Over Ocean and Land." Journal of Geophysical Research: Atmospheres 2019JD030622 [10.1029/2019jd030622] [Journal Article/Letter]

2019. "A Relationship between Blue and Near‐IR Global Spectral Reflectance and the Response of Global Average Reflectance to Change in Cloud Cover Observed from DSCOVR EPIC." Earth and Space Science 6 1416-1429 [10.1029/2019ea000664] [Journal Article/Letter]

2019. "Approximate Entropy and Sample Entropy: A Comprehensive Tutorial." Entropy 21 (6): 541 [10.3390/e21060541] [Journal Article/Letter]

2019. "Cellular Statistical Models of Broken Cloud Fields. Part IV: Effects of Pixel Size on Idealized Satellite Observations." Journal of the Atmospheric Sciences 76 (5): 1329-1348 [10.1175/jas-d-18-0345.1] [Journal Article/Letter]

2019. "Cloud products from the Earth Polychromatic Imaging Camera (EPIC): algorithms and initial evaluation." Atmospheric Measurement Techniques 12 (3): 2019-2031 [10.5194/amt-12-2019-2019] [Journal Article/Letter]

2019. "Exploring aerosols near clouds with high-spatial-resolution aircraft remote sensing during SEAC4RS." Journal of Geophysical Research: Atmospheres [10.1029/2018jd028989] [Journal Article/Letter]

2018. "Satellite Observations of Cloud-Related Variations in Aerosol Properties." Atmosphere 9 (11): 430 [10.3390/atmos9110430] [Journal Article/Letter]

2018. "Cloud information content in EPIC/DSCOVR’s oxygen A- and B-band channels: A physics-based approach." Journal of Quantitative Spectroscopy and Radiative Transfer 220 84-96 [10.1016/j.jqsrt.2018.09.006] [Journal Article/Letter]

2018. "Implications of Whole-Disc DSCOVR EPIC Spectral Observations for Estimating Earth’s Spectral Reflectivity Based on Low-Earth-Orbiting and Geostationary Observations." Remote Sensing 10 (10): 1594 [10.3390/rs10101594] [Journal Article/Letter]

2018. "Earth Observations from DSCOVR/EPIC Instrument." Bulletin of the American Meteorological Society BAMS-D-17-0223.1 [10.1175/bams-d-17-0223.1] [Journal Article/Letter]

2018. "Cloud information content in EPIC/DSCOVR’s oxygen A- and B-band channels: An optimal estimation approach." Journal of Quantitative Spectroscopy and Radiative Transfer 216 6-16 [10.1016/j.jqsrt.2018.05.007] [Journal Article/Letter]

2018. "Reduction in 317–780 nm radiance reflected from the sunlit Earth during the eclipse of 21 August 2017." Atmospheric Measurement Techniques 11 (7): 4373-4388 [10.5194/amt-11-4373-2018] [Journal Article/Letter]

2018. "Remote Sensing of Droplet Number Concentration in Warm Clouds: A Review of the Current State of Knowledge and Perspectives." Reviews of Geophysics 56 (2): 409-453 [10.1029/2017rg000593] [Journal Article/Letter]

2018. "EPIC Spectral Observations of Variability in Earth’s Global Reflectance." Remote Sensing 10 (2): 254 [10.3390/rs10020254] [Journal Article/Letter]

2018. "Calibration of the DSCOVR EPIC visible and NIR channels using MODIS Terra and Aqua data and EPIC lunar observations." Atmospheric Measurement Techniques 11 (1): 359-368 [10.5194/amt-11-359-2018] [Journal Article/Letter]

2017. "Observation-Based Study on Aerosol Optical Depth and Particle Size in Partly Cloudy Regions." Journal of Geophysical Research: Atmospheres 122 (18): 10,013-10,024 [10.1002/2017jd027028] [Journal Article/Letter]

2017. "Cellular Statistical Models of Broken Cloud Fields. Part III: Markovian Properties." Journal of the Atmospheric Sciences 74 (9): 2921-2935 [10.1175/jas-d-17-0075.1] [Journal Article/Letter]

2017. "Passive remote sensing of altitude and optical depth of dust plumes using the oxygen A and B bands: First results from EPIC/DSCOVR at Lagrange-1 point." Geophysical Research Letters 44 (14): 7544-7554 [10.1002/2017gl073939] [Journal Article/Letter]

2017. "Terrestrial glint seen from deep space: Oriented ice crystals detected from the Lagrangian point." Geophysical Research Letters Online [10.1002/2017gl073248] [Journal Article/Letter]

2017. "Snow grain size retrieval over the polar ice sheets with the Ice, Cloud, and land Elevation Satellite (ICESat) observations." Journal of Quantitative Spectroscopy and Radiative Transfer [10.1016/j.jqsrt.2016.03.033] [Journal Article/Letter]

2017. "The spectral invariant approximation within canopy radiative transfer to support the use of the EPIC/DSCOVR oxygen B-band for monitoring vegetation." Journal of Quantitative Spectroscopy and Radiative Transfer 191 7-12 [10.1016/j.jqsrt.2017.01.015] [Journal Article/Letter]

2016. "Testing the Two-Layer Model for Correcting Near Cloud Reflectance Enhancement Using LES/SHDOM Simulated Radiances ." J. Geophys. Res., Atmos. (121): 9661–9674 [10.1002/2016JD025021] [Journal Article/Letter]

2016. "Observation of the spectrally invariant properties of clouds in cloudy-to-clear transition zones during the MAGIC field campaign." Atmospheric Research 182 294-301 [10.1016/j.atmosres.2016.08.004] [Journal Article/Letter]

2016. "A framework based on 2-D Taylor expansion for quantifying the impacts of subpixel reflectance variance and covariance on cloud optical thickness and effective radius retrievals based on the bispectral method." Journal of Geophysical Research: Atmospheres 121 (12): 7007-7025 [10.1002/2016jd024837] [Journal Article/Letter]

2016. "New statistical model for variability of aerosol optical thickness: Theory and application to MODIS data over ocean." Journal of the Atmospheric Sciences 73 (2): 821-837 [10.1175/jas-d-15-0130.1] [Journal Article/Letter]

2015. "Effect of cloud fraction on near-cloud aerosol behavior in the MODIS atmospheric correction ocean color product." Rem. Sens 7 5283-5299 [10.3390/rs70505283] [Journal Article/Letter]

2015. "Cloud thermodynamic phase detection with polarimetrically sensitive passive sky radiometers." Atmos. Meas. Tech 8 1537-1554 [10.5194/amt-8-1537-2015] [Journal Article/Letter]

2014. "Properties and potential radiative impacts of Antarctic blowing snow." Remote Sensing of the Atmosphere, Clouds, and Precipitation V [10.1117/12.2068038] [Proceedings]

2014. "CALIPSO observations of near-cloud aerosol properties as a function of cloud fraction." Geophys. Res. Lett 41 9150-9157 [10.1002/2014GL061896] [Journal Article/Letter]

2014. "Near-cloud aerosol properties from the 1 km resolution MODIS ocean product." J. Geophys. Res. Atmos. 119 (3): 1546-1554 [10.1002/2013JD020633] [Journal Article/Letter]

2014. "Extending 3D near-cloud corrections from shorter to longer wavelengths." Journal of Quantitative Spectroscopy and Radiative Transfer 147 79-85 [10.1016/j.jqsrt.2014.05.022] [Journal Article/Letter]

2014. "First satellite-detected perturbations of outgoing longwave radiation associated with blowing snow events over Antarctica." Geophys. Res. Lett 41 (2): 730-735 [10.1002/2013GL058932] [Journal Article/Letter]

2013. "Correction of MODIS aerosol retrieval for 3D radiative effects in broken cloud fields." AIP Conference Proceedings 1531 (1): [10.1063/1.4804761] [Proceedings]

2013. "A method of retrieving cloud top height and cloud geometrical thickness with oxygen A and B bands for the Deep Space Climate Observatory (DSCOVR) mission: Radiative transfer simulations." Journal of Quantitative Spectroscopy and Radiative Transfer 122 141-149 [10.1016/j.jqsrt.2012.09.017] [Journal Article/Letter]

2013. "Shape-induced gravitational sorting of Saharan dust during transatlantic voyage: Evidence from CALIOP lidar depolarization measurements." Geophys. Res. Lett 40 (12): 3281-3286 [10.1002/grl.50603] [Journal Article/Letter]

2013. "Reply to Ollinger et al.: Remote sensing of leaf nitrogen and emergent ecosystem properties." Proceedings of the National Academy of Sciences 110 (27): E2438-E2438 [10.1073/pnas.1305930110] [Journal Article/Letter]

2013. "Improvement of MODIS aerosol retrievals near clouds." J. Geophys. Res. Atmos. 118 (16): 9168-9181 [10.1002/jgrd.50617] [Journal Article/Letter]

2013. "Assessment of Cloud Screening With Apparent Surface Reflectance in Support of the ICESat-2 Mission." IEEE Trans. Geosci. Remote Sensing 51 (2): 1037-1045 [10.1109/TGRS.2012.2204066] [Journal Article/Letter]

2013. "Multi-satellite aerosol observations in the vicinity of clouds." Atmos. Chem. Phys. 13 (8): 3899-3908 [10.5194/acp-13-3899-2013] [Journal Article/Letter]

2013. "Reply to Townsend et al.: Decoupling contributions from canopy structure and leaf optics is critical for remote sensing leaf biochemistry." Proceedings of the National Academy of Sciences 110 (12): E1075-E1075 [10.1073/pnas.1301247110] [Journal Article/Letter]

2012. "Hyperspectral remote sensing of foliar nitrogen content." Proceedings of the National Academy of Sciences 110 (3): E185-E192 [10.1073/pnas.1210196109] [Journal Article/Letter]

2012. "CALIPSO observations of transatlantic dust: vertical stratification and effect of clouds." Atmos. Chem. Phys. 12 (23): 11339-11354 [Full Text] [10.5194/acp-12-11339-2012] [Journal Article/Letter]

2012. "Effect of CALIPSO cloud–aerosol discrimination (CAD) confidence levels on observations of aerosol properties near clouds." Atmospheric Research 116 134-141 [10.1016/j.atmosres.2012.03.013] [Journal Article/Letter]

2012. "Racoro Extended-Term Aircraft Observations of Boundary Layer Clouds." Bulletin of the American Meteorological Society 93 (6): 861-878 [10.1175/BAMS-D-11-00189.1] [Journal Article/Letter]

2012. "On spectral invariance of single scattering albedo for water droplets and ice crystals at weakly absorbing wavelengths." J. Quant. Spectrosc. Radiat. Trans 113 (9): 715-720 [10.1016/j.jqsrt.2012.02.021] [Journal Article/Letter]

2012. "Cloud droplet size and liquid water path retrievals from zenith radiance measurements: examples from the Atmospheric Radiation Measurement Program and the Aerosol Robotic Network." Atmos. Chem. Phys. 12 (21): 10313-10329 [10.5194/acp-12-10313-2012] [Journal Article/Letter]

2012. "Analysis of co-located MODIS and CALIPSO observations near clouds." Atmos Meas Tech 5 (2): 389-396 [10.5194/amt-5-389-2012] [Journal Article/Letter]

2011. "On the accuracy of double scattering approximation for atmospheric polarization computations." J. Quant. Spec. Rad. Trans 113 (2): 172-181 [10.1016/j.jqsrt.2011.10.008] [Journal Article/Letter]

2011. "Satellite remote sensing of blowing snow properties over Antarctica." Journal of Geophysical Research 116 (D16): D16123 [10.1029/2011jd015828] [Journal Article/Letter]

2011. "Cloud Impact on Surface Altimetry From a Spaceborne 532-nm Micropulse Photon-Counting Lidar: System Modeling for Cloudy and Clear Atmospheres." IEEE Trans. Geosci. Remote Sensing 49 (12): 4910-4919 [Full Text] [10.1109/TGRS.2011.2153860] [Journal Article/Letter]

2011. "Spectrally Invariant Approximation within Atmospheric Radiative Transfer." J Atmos Sci 68 (12): 3094-3111 [10.1175/JAS-D-11-060.1] [Journal Article/Letter]

2011. "Global CALIPSO Observations of Aerosol Changes Near Clouds." IEEE Geosci. Remote Sensing Lett. 8 (1): 19-23 [10.1109/LGRS.2010.2049982] [Journal Article/Letter]

2010. "The ICESat-2 Laser Altimetry Mission." Proc. IEEE 98 (5): 735-751 [10.1109/JPROC.2009.2034765] [Journal Article/Letter]

2010. "Cellular Statistical Models of Broken Cloud Fields. Part I: Theory." J Atmos Sci 67 (7): 2125-2151 [10.1175/2010JAS3364.1] [Journal Article/Letter]

2010. "Analysis of snow bidirectional reflectance from ARCTAS Spring-2008 Campaign." Atmos. Chem. Phys. 10 (9): 4359-4375 [10.5194/acp-10-4359-2010] [Journal Article/Letter]

2010. "Solar radiation transport in the cloudy atmosphere: a 3D perspective on observations and climate impacts." Rep. Prog. Phys. 73 (2): 026801 [10.1088/0034-4885/73/2/026801] [Journal Article/Letter]

2010. "Uncertainties in Ice-Sheet Altimetry From a Spaceborne 1064-nm Single-Channel Lidar Due to Undetected Thin Clouds." IEEE Trans. Geosci. Remote Sensing 48 (1): 250-259 [10.1109/TGRS.2009.2028335] [Journal Article/Letter]

2010. "Spectrally-invariant behavior of zenith radiance around cloud edges simulated by radiative transfer." Atmos. Chem. Phys. 10 (22): 11295-11303 [10.5194/acp-10-11295-2010] [Journal Article/Letter]

2010. "Cellular Statistical Models of Broken Cloud Fields. Part II: Comparison with a Dynamical Model and Statistics of Diverse Ensembles." J Atmos Sci 67 (7): 2152-2170 [10.1175/2010JAS3365.1] [Journal Article/Letter]

2009. "MODIS observations of enhanced clear sky reflectance near clouds." Geophys. Res. Lett. 36 (6): L06807 [10.1029/2008GL037089] [Journal Article/Letter]

2009. "Physical interpretation of the spectral radiative signature in the transition zone between cloud-free and cloudy regions." Atmos. Chem. Phys. 9 (4): 1419-1430 [10.5194/acp-9-1419-2009] [Journal Article/Letter]

2009. "A Simple Stochastic Model for Generating Broken Cloud Optical Depth and Cloud-Top Height Fields." J Atmos Sci 66 (1): 92-104 [10.1175/2008JAS2699.1] [Journal Article/Letter]

2008. "Importance of molecular Rayleigh scattering in the enhancement of clear sky radiance in the vicinity of boundary layer cumulus clouds." J. Geophys. Res. 113 [10.1029/2008JD010592] [Journal Article/Letter]

2008. "A simple model for the cloud adjacency effect and the apparent bluing of aerosols near clouds." J. Geophys. Res. 113 [10.1029/2007JD009196] [Journal Article/Letter]

2008. "The Potential for Improved Boundary Layer Cloud Optical Depth Retrievals from the Multiple Directions of MISR." Journal of the Atmospheric Sciences 65 (10): 3179-3196 [10.1175/2008JAS2627.1] [Journal Article/Letter]

2008. "Simulation of vector semibinary homogeneous random fields and modeling of broken clouds." Numeric Anal Appl 1 (3): 285-292 [10.1134/S1995423908030099] [Journal Article/Letter]

2008. "Retrievals of Thick Cloud Optical Depth from the Geoscience Laser Altimeter System (GLAS) by Calibration of Solar Background Signal." J. Atmos. Sci. 65 (11): 3513-3526 [10.1175/2008JAS2744.1] [Journal Article/Letter]

2008. "Remote sensing of cloud sides of deep convection: towards a three-dimensional retrieval of cloud particle size profiles." Atmos. Chem. Phys. 8 (16): 4741-4757 [10.5194/acp-8-4741-2008] [Journal Article/Letter]

2007. "Cloud optical depth retrievals from solar background "signal" of micropulse lidars." IEEE Geo Rem Sens 4 (3): 456-460 [10.1109/LGRS.2007.896722] [Journal Article/Letter]

2007. "View angle dependence of cloud optical thicknesses retrieved by Moderate Resolution Imaging Spectroradiometer (MODIS)." J. Geophys. Res. 112 (D6): D06203 [10.1029/2005JD006912] [Journal Article/Letter]

2007. "3D aerosol-cloud radiative interaction observed in collocated MODIS and ASTER images of cumulus cloud fields." J. Geophys. Res. 112 [10.1029/2005JD006686] [Journal Article/Letter]

2007. "The effects of scattering angle and cumulus cloud geometry on satellite retrievals of cloud drop effective radius." Geosci Rem Sens Lett 45 (4): 1039-1045 [Journal Article/Letter]

2007. "Remote sensing the vertical profile of cloud droplet effective radius thermodynamic phase and temperature." Atmos Chem Phys Disc 7 4481-4519 [Journal Article/Letter]

2007. "Thin Liquid Water Clouds: Their Importance and Our Challenge." Bull Amer Meteor Soc 88 177-190 [Journal Article/Letter]

2006. "Impact of three-dimensional radiative effects on satellite retrievals of cloud droplet sizes." J. Geophys. Res. 111 (D9): D09207 [10.1029/2005JD006686] [Journal Article/Letter]

2006. "New directions in the radiative transfer of cloudy atmospheres." Eos Trans. AGU 87 (5): 52 [10.1029/2006EO050006] [Journal Article/Letter]

2006. "What does reflection from cloud sides tell us about vertical distribution of cloud droplet sizes?." Atmos Chem and Phys 6 5295-5305 [Journal Article/Letter]

2006. "Impact of 3D Clouds on Clear Sky Reflectance and Aerosol Retrieval in a Biomass Burning Region of Brazil." IEEE Geo Rem Sens Lett 3 169-172 [10.1109/LGRS.2005.861386] [Journal Article/Letter]

2005. "On the validation of the Poisson model of broken clouds." Izvestiya Atmospheric and Oceanic Physics 6 783-797 [Journal Article/Letter]

2005. "Small-scale drop size variability: Empirical models for drop-size-dependent clustering in clouds." J Atmos Sci 62 551-558 [Journal Article/Letter]

2005. "Numerical model of broken clouds adapted to observations." Atmospheric and Oceanic Optics 18 236-242 [Journal Article/Letter]

2005. "Small-scale drop size variability: Impact on estimation of cloud optical properties." J Atmos Sci 62 2555-2567 [Journal Article/Letter]

2005. "The International Intercomparison of 3D Radiation Codes (I3RC): Bringing together the most advanced radiative transfer tools for cloudy atmospheres." Bull Amer Meteor Soc 86 (9): 1275-1293 [10.1175/BAMS-86-9-1275] [Journal Article/Letter]

2004. "Automated cloud screening algorithm for MFRSR data." Geophys Res Lett 31 (4): L04118 [10.1029/2003GL019105] [Journal Article/Letter]

2004. "Scaling properties of aerosol optical thickness retrieved from ground-based measurements." J Atmos Sci 61 1024-1039. [Journal Article/Letter]

2004. "The 'RED versus NIR' plane to retrieve broken-cloud optical depth from ground-based measurements." J Atmos Sci 61 1911-1925 [Journal Article/Letter]

2004. "Photon propagation in heterogeneous optical media with spatial correlations: Enhanced mean-free-paths and wider-than-exponential free-path distribution." J Quant Spectr and Rad Trans 84 3-34 [Journal Article/Letter]

2003. "Consistency of ARESE II cloud absorption estimates and sampling issues." J. Geophys. Res. 108 (D1): 4029 [10.1029/2002JD002243] [Journal Article/Letter]

2003. "An Introduction to Atmospheric Radiation (second edition) Book Review." Bull Amer Meteor Soc 84 (6): 799-801 [Journal Article/Letter]

2002. "A missing solution to the transport equation and its effect on estimation of cloud absorptive properties." J Atmos Sci 59 (24): 3572-3585 [10.1175/1520-0469(2002)059<3572:AMSTTT>2.0.CO;2] [Journal Article/Letter]

2002. "Observations of three-dimensional radiative effects that influence satellite retrievals of cloud properties." Quart Jour of Hungarian Meteor Service (Idojaras) 106 265-278 [Journal Article/Letter]

2002. "Observations of three-dimensional radiative effects that influence MODIS cloud optical thickness retrievals." J Atmos Sci 59 1607-1618 [Journal Article/Letter]

2002. "Space-time characteristics of light transmitted through dense clouds: A Green's Function Analysis." J Atmos Sci 59 2713-2727 [Journal Article/Letter]

2002. "Inference of cloud optical properties from aircraft-based solar radiometric measurements." J Atmos Sci 59 2093-2111 [Journal Article/Letter]

2001. "Cloud characterization and clear sky correction from Landsat 7." Remote Sens Environ 78 (1-2): 83-98 [10.1016/S0034-4257(01)00251-6] [Journal Article/Letter]

2001. "Green functions for multiple scattering as mathematical tools for dense cloud remote sensing: theory, with passive and active applications, in Laser Radar Technology and Applications VI." [Book]

2001. "Statistical analysis of the uncertainties in cloud optical depth retrievals caused by three-dimensional radiative effects." J Atmos Sci 58 1540-1548 [Journal Article/Letter]

2001. "Spectral density of cloud liquid water content at high frequencies." J Atmos Sci 58 497-503 [Journal Article/Letter]

2001. "Multiple scattering in clouds: Insights from three-dimensional diffusion theory." Nuclear Sci and Engin 137 251-280 [Journal Article/Letter]

2001. "Inferring optical depth of broken clouds above green vegetation using surface solar radiometric measurements." J Atmos Sci 58 2989-3006 [Journal Article/Letter]

2000. "A new normalized difference cloud retrieval technique applied to Landsat radiances over the Oklahoma ARM Site." J Appl Meteor 39 (12): 2305-2320 [10.1175/1520-0450(2000)039<2305:ANNDCR>2.0.CO;2] [Journal Article/Letter]

2000. "Cloud three-dimensional effects evidenced in Landsat spatial power spectra and autocorrelation functions." J Geophys Res 105 (D11): 14777-14788 [10.1029/2000JD900153] [Journal Article/Letter]

2000. "Cloud-vegetation interaction: Use of normalized difference cloud index for estimation of cloud optical thickness." Geophys Res Lett 27 (12): 1695-1698 [10.1029/1999GL010993] [Journal Article/Letter]

2000. "Mathematical aspects of BRDF modeling: Adjoint problem and Greens function." Remote Sens Rev 18 263-280 [Journal Article/Letter]

1999. "On the Removal of the Effect of Horizontal Fluxes In Two-Aircraft Measurements of Cloud Absorption." Q.J Royal Met. Soc. 125 (558): 2153-2170 [10.1002/qj.49712555811] [Journal Article/Letter]

1999. "Horizontal radiative fluxes in clouds and accuracy of the independent pixel approximation at absorbing wavelengths." Geophys. Res. Lett. 26 (11): 1585-1588 [10.1029/1999GL900306] [Journal Article/Letter]

1998. "Insight into three-dimensional radiation transport from diffusion theory, application to the cloudy atmosphere, in Radiative Transfer." [10.1615/ICHMT.1997.IntSymLiqTwoPhaseFlowTranspPhen] [Book]

1998. "Radiative effects of sub-mean-free-path liquid water variability observed in stratiform clouds." J. Geophys. Res. 103 19557-19567 [10.1029/98JD01728] [Journal Article/Letter]

1998. "Nonlocal Independent Pixel Approximation, direct and inverse problems." IEEE Trans. Geosci. Remote Sens. 36 [10.1109/36.655329] [Journal Article/Letter]

1998. "Biases in shortwave column absorption in the presence of fractal clouds." J. Climate 11 431-446 [10.1175/1520-0442(1998)011<0431:BISCAI>2.0.CO;2] [Journal Article/Letter]

1997. "Evidence for net horizontal radiative fluxes in marine stratocumulus, in IRS '96: Current Problems in Atmospheric Radiation." [Book]

1997. "Retrieval of physical and optical cloud thicknesses from space-borne and wide-angle lidar, in Advances inn Atmospheric Remote Sensing with Lidar." [10.1007/978-3-642-60612-0] [Book]

1997. "Physical simulation of high resolution satellite images for fractal cloud models, in Fractal Frontiers." [Book]

1997. "The effect of horizontal fluxes on cloud absorption estimates based on simulated two-aircraft measurements of fractal clouds, in IRS '96: Current Problems in Atmospheric Radiation." [Book]

1997. "Nonlocal Independent Pixel Approximation for computing radiation fields of inhomogeneous clouds, in IRS '96: Current Problems in Atmospheric Radiation." [Book]

1997. "Cloud Macrostructure and Radiation, in Remote Sensing: A Scientific Vision for Sustainable Development." [10.1109/IGARSS.1997.608888] [Book]

1997. "Scale-invariance of liquid water distributions in marine stratocumulus. II. Multifractal properties and intermittency issues." J. Atmos. Sci. 54 1423-1444 [10.1175/1520-0469(1997)054<1423:SIILWD>2.0.CO;2] [Journal Article/Letter]

1997. "Inhomogeneity effects on cloud shortwave absorption measurements: Two-aircraft simulations." J. Geophys. Res. 102 16619-16637 [10.1029/97JD01153] [Journal Article/Letter]

1997. "The Landsat scale break in stratocumulus as a three-dimensional radiative transfer effect: Implications for cloud remote sensing." J. Atmos. Res. 54 241-260 [10.1175/1520-0469(1997)054<0241:TLSBIS>2.0.CO;2] [Journal Article/Letter]

1997. "Interactions, solar and Laser beams in stratus clouds, fractals and multifractals in climate and remote sensing studies." Fractals 5 129-166 [Journal Article/Letter]

1996. "Multifractal characterizations of intermittency in nonstationary geophysical signals and fields, in Nonstationary Random Processes and Their Applications." [Book]

1996. "Scale-invariance of liquid water distributions in marine stratocumulus. I. Spectral properties and stationarity issues." J. Atmos. Sci. 53 1538-1558 [10.1175/1520-0469(1996)053<1538:SIOLWD>2.0.CO;2] [Journal Article/Letter]

1995. "Radiative smoothing in fractal clouds." J. Geophys. Res. 100 26247-26261 [10.1029/95JD02895] [Journal Article/Letter]

1995. "The interpretation of spectral vegetation indexes." IEEE Trans. Geosci. Remote Sensing 33 (2): 481-486 [10.1109/36.377948] [Journal Article/Letter]

1994. "Bounded Cascade Models as non-stationary multifractals." Phys. Rev. E49 55-69 [10.1103/PhysRevE.49.55] [Journal Article/Letter]

1994. "Multifractal characterizations of non-stationarity and intermittency in geophysical fields: Observed, retrieved, or simulated." J. Geophys. Res. 99 8055-8072 [10.1029/94JD00219] [Journal Article/Letter]

1993. "Multi-singular and multi-affine properties of Bounded Cascade Models." Fractals 3 702-710 [Journal Article/Letter]

1989. "Monte Carlo method application to solution of the radiative transfer equation for a plane layer of vegetation." Soviet J. of Atmos. Opt. (Russian) 1206-1212 [Journal Article/Letter]

1989. "On the connection between the First Point of Quadrature Formulae and the convergence rate of the Discrete Ordinates Method." USSR Comput. Maths. Math. Phys. (Russian translated into English 29 5 1-8 1991) 1267-1276 [Journal Article/Letter]

1989. "Estimation of the influence of leaf orientation and the specular component on the vegetation phase function." Soviet J. of Atmos. Opt.(Russian) 76-85 [Journal Article/Letter]

1989. "The influence of leaf orientation and the specular component of leaf reflectance on the canopy bidirectional reflectance." Remote Sens. Environ. 251-260 [Journal Article/Letter]

1989. "Effect of the hot spot on the Transport Equation in plant canopies." J. Quant. Spectr. and Rad. Trans. 42 (6): 615-630 [10.1016/0022-4073(89)90055-1] [Journal Article/Letter]

1988. "Calculation of canopy bidirectional reflectance using the Monte Carlo method." Remote Sens. Environ. 24 (3): 213-225 [10.1016/0034-4257(88)90026-0] [Journal Article/Letter]

1987. "On the restitution of the optical parameters of the canopy using the data of spectral brightness coefficient by the Monte Carlo method." Trans. of Estonian Academy of Sci. Phys.-Math. (Russian) 289-293 [Journal Article/Letter]

1987. "A remark on the approximation of the exponential integrals." Trans. of Estonian Academy of Sci. Phys.-Math. (Russian) 55-57 [Journal Article/Letter]

1987. "Estimation of the influence of the canopy architecture parameters on the bidirectional reflectance by means of the Monte Carlo method." Soviet J. of Remote Sens. (Russian translated into English) 86-93 [Journal Article/Letter]

1987. "Monte Carlo determination of spectral radiance of the vegetation cover as a function of illumination conditions." Soviet J. of Remote Sens. (Russian translated into English 7 4 726-739 1990) 96-105 [Journal Article/Letter]

1986. "One estimate of the accuracy of the approximation the exponential integral by the quadrature rules." Trans. of Estonian Academy of Sci. Phys.-Math. (Russian) 249-257 [Journal Article/Letter]

1986. "A remark on the Clenshaw-Curtis quadrature rule." Trans. of Estonian Academy of Sci. Phys.-Math. (Russian) 338-340 [Journal Article/Letter]

1986. "The nonstandard form of the error for quadrature rules with strongly nonuniform position of quadrature points." Trans. of Estonian Academy of Sci. Phys.-Math. (Russian) 390-399 [Journal Article/Letter]

1985. "On the solution of the Transport Equation with periodic boundary conditions by the Method of Discrete Ordinates." Transport Theory Statis. Phys. 323-351 [Journal Article/Letter]

1984. "Calculation of the solar radiation reflection function from plant cover using Monte Carlo method." Soviet J. of Remote Sens. (Russian translated into English 7 2 346-360 1990) 58-67 [Journal Article/Letter]

1982. "On the approximation of the exponential integral by quadrature formulae." USSR Comput. Maths. Math. Phys. (Russian translated into English) 1044-1051 [Journal Article/Letter]

1981. "On the solution of the Transport Equation in a heterogeneous medium by the Discrete Ordinates Method." Trans. of Estonian Academy of Sci. Phys.-Math. (Russian) 190-201 [Journal Article/Letter]

1981. "On the solution of the Transport Equation in spherical geometry by the Discrete Ordinates Method." Trans. of Estonian Academy of Sci. Phys.-Math. (Russian) 364-375 [Journal Article/Letter]

1979. "On the rate of convergence of the Discrete Ordinates Method in case of Gauss Quadrature Rule." Trans. of Tartu Univ. (Russian) 92-104 [Journal Article/Letter]

1978. "On the convergence rate of the Method of Discrete Ordinates in the radiation transport theory." Izv. VUZov Math. (Russian) 11-21 [Journal Article/Letter]