Sciences and Exploration Directorate

Steven E Platnick

(Deputy Director for Atmospheres)

Steven E Platnick's Contact Card & Information.
Phone: 301.614.5636
Org Code: 610
Mail Code 610.8
Greenbelt, MD 20771

Brief Bio

Steven Platnick's research includes theoretical/experimental studies of satellite, aircraft, and ground-based cloud remote sensing. He has been involved extensively with remote sensing field studies, including use of the MODIS Airborne Simulator instrument flown on the NASA ER-2 along with flight scientist roles in a number of field campaigns. He is a member of the MODIS and S-NPP Atmosphere Science Team working on operational cloud optical and microphysical products, as well as the MODIS Atmosphere Team Lead.

Platnick became a civil servant in the Climate and Radiation Branch in the Laboratory for Atmospheres in 2002 and then moved to the Earth Science Division in 2009. He has served as the head EOS Project Science Office since 2008, and as Deputy Director for Atmospheres in the Earth Science Division since January 2015. Prior to becomin a civil servant, Platnick was a research associate professor in the Joint Center for Earth Systems Technology, University of Maryland Baltimore County - an affiliation begun in 1996. During this time he led the development of a comprehensive set of graduate-level atmospheric physics courses within the Department of Physics of which he taught several. He previously held a National Research Council Research Associate position at the NASA Ames Research Center as well as a research and development position at the Hewlett-Packard Co. for six years. His work with Hewlett-Packard included two years as a visiting faculty in the Department of Electrical Engineering at North Carolina A&T State University.

He received B.S. and M.S. degrees in electrical engineering from Duke University and the University of California, Berkeley, respectively, and a Ph.D. in atmospheric sciences from the University of Arizona.

Current Projects

MODIS Atmosphere Team Lead and Cloud Optical Products


The GSFC Cloud Retrieval Group enhancees, maintains, and evaluates three existing MODIS Atmosphere Team algorithms currently being produced by the MODIS Adaptive Processing System (MODAPS) at NASA GSFC. These global products, produced for both MODIS Terra and Aqua, are:

1. The Level-2 Cloud Optical/Microphysical Properties component of the MODIS cloud product (MOD06 and MYD06 for Terra and Aqua, respectively), an algorithm for determining cloud retrieval thermodynamic phase, optical thickness, effective particle radius, and water path for liquid and ice clouds. Product includes pixel- level uncertainties for a subset of error sources and a variety of quality assessment fields useful for Level-3 aggregations as well as Level-2 studies.

2. All MODIS Atmosphere Team Level-3 products (cloud mask, aerosols, clouds, clearsky) on a 1° grid (MOD08/MYD08). The product includes scalar, 1-D, and 2-D statistics aggregated over one day, 8-days (half the orbit repeat cycle), and one month. Included in this effort is the refinement of a subsetted netCDF cloud dataset designed for evaluation of cloud fields produced by climate models as a companion to the COSP MODIS retrieval simulator.

3. The Atmosphere Team Level-2 Joint Product (MODATML2/ MYDATML2) consisting of essential atmosphere datasets sampled every 5-10 km in a manner consistent with the Level-3 product. Tthe product is designed: (a) for research Level-3 aggregation studies; (b) to ease storage requirements of core atmosphere data prod- ucts for users performing studies requiring Level-2 data over long time periods and/ or combined (correlated) cloud, aerosol, etc. datasets.

Other key team members: R. E. Holz (U. Wisc.), M. D. King (U. Colorado), and K. G. Meyer (USRA)

Suomi-NPP Atmosphere Team – Cloud Product Algorithm Development


While critical for climate studies, continuity of cloud data records between MODIS and VIIRS is problematic because of the absence of key spectral channels on VIIRS (CO2-slicing, water vapor) and a significant change in the spectral location for a key shortwave infrared band used for cloud microphysical retrievals.

In this project we are working to develop a suite of Level-2 (L2) algorithms that can be applied to the spectral channels common to the two instruments. The code is based on the MODIS Collection 6 algorithms for cloud mask and cloud optical/microphysical properties, and the NOAA GOES-R Algorithm Working Group (AWG) algorithm for cloud-top properties. Since the algorithms can be run with similar spectral observations from both MODIS and VIIRS, they provide the basis for establishing a continuous cloud data record across the two instruments.

Other team members: S. A. Ackerman (U. Wisc.), A. Heidinger (NOAA), R. E. Holz (U. Wisc.), and K. G. Meyer (USRA)

PACE Ocean Color Imager Cloud Product Studies


Obtaining cloud climate data records from the current generation of global imagers (MODIS, VIIRS) is challenging due to the need for exacting reflectance stability over multiple decades. Imager stability requirements for ocean color applications have been demonstrated to the sub-percent level for SeaWiFS using lunar observations; similar capabilities for the PACE Ocean Color Instrument (OCI) are defined in the PACE Science Definition Team (SDT) report, in addition to stringent requirements in other radiometric/spectral specifications that are essential for the establishing climate records. Understanding the extent to which the PACE imager can be used to produce relevant and stable cloud products is of strategic importance.

In this project we support PACE ocean color imager instrument requirements related to cloud property retrievals as part of the “Atmospheric Correction” measurement suite. 

Other team members: Odele Coddington, Sebastian Schmidt, Peter Pilewskie (U. Colorado), S. A. Ackerman (U. Wisc.), A. Heidinger (NOAA), K. G. Meyer (USRA), Z. Zhang (UMBC)


Physical Scientist


December 2002 - Present


Research Associate Professor

UMBC - Baltimore, MD

July 1996 - December 2002

Joint Center for Earth Systems Technology (JCET), affiliated with Dept. of Physics.

National Research Council (NRC) post-doctoral associate

USRA/NASA Ames Research Center - Moffett Field, CA

September 1991 - February 1993

Calibration and field use of in-house narrow and broadband IR radiometers flown onboard the NASA ER-2 high altitude aircraft and NASA's DC-8 aircraft during AASE-II field campaign. Design and development of a narrow-band visible radiometer used for satellite calibration and remote sensing of cloud properties. AVHRR cloud retrieval validation studies as part of the ASTEX experiment.

Research Assistant

Institute of Atmospheric Physics, University of Arizona - Tucson, AZ

August 1987 - September 1991

R&D Engineer

Network Measurement Division Hewlett-Packard Co. - Santa Rosa, CA

May 1981 - August 1987


Teaching Experience

UMBC: Adjunct Faculty, Department of Physics, July 2003: Co-taught graduate-level atmospheric physics course (spring 2003, 2004)

UMBC: Research Faculty, July 1996 – December 2002: Led development of a seven-course atmospheric physics curriculum within the department of physics graduate program. Taught three different graduate-level courses in atmospheric physics. Served as JCET representative to the Physics faculty, JCET radiation group leader, member JCET board of directors.

North Carolina A & T State University: Department of Electrical Engineering, Greensboro, NC, August 1985 – May 1987. Visiting Professor under the H-P Faculty Loan Program. Taught upper division lecture and laboratory courses in circuit analysis and electromagnetic theory, developed handbooks for circuit analysis laboratory classes.

Sonoma State University: Department of Physics and Astronomy, Rhonert Park, CA, fall 1984. Lecturer, taught upper division course in electromagnetic theory.


Ph.D., Atmospheric Sciences: University of Arizona, Tucson AZ, September 1991. Dissertation: "Remote Sensing the Susceptibility of Cloud Albedo to Changes in Drop Concentration", Advisor: S. A. Twomey.

M.S.E., Electrical Engineering: University of California, Berkeley CA, December 1980. Thesis Title: "Bistatic Microwave Phase Measurements".

B.S.E., Electrical Engineering: Duke University, Durham NC, May 1979.

Professional Service

 JGR-Atmospheres Associate Editor (2008-2011)


Verner E. Suomi Award, American Meteorological Society (AMS), January 2016

Fellow, American Meteorological Society (AMS), January 2016

NASA Agency Honor Award, Exceptional Service Medal, July 2015

NASA Agency Honor Award, Exceptional Achievement Medal, May 2008

NASA Group Achievement Award: FIREX-AQ Field Campaign Team, September 2020

NASA Group Achievement Award: ORACLES Field Campaign Team, August 2019

NASA Agency Team Excellence Award: Satellite Needs Assessment Team, October 2017

NASA Group Achievement Award: obs4MIPs, June 2015

NASA Group Achievement Award: SEAC4RS Field Campaign, Feb. 2015

NASA Group Achievement Award: AMSR-E Instrument Recovery Team, July 2013

NASA Group Achievement Award: CLARREO Mission Concept Team, August 2012

NASA Group Achievement Award: Earth Science Constellation Red Team, June 2011

NASA Group Achievement Award: Science Mission Directorate ARRA Team, June 2011

NASA Group Achievement Award: TC4 Team, Feb 2009

NASA Group Achievement Award: MODIS Science Data Support Team, May 2007

Scientific Research Peer Award, Laboratory for Atmospheres, NASA GSFC, July 2005

NASA Group Achievement Award: Aqua Mission Team, August 2003

NASA Group Achievement Award: CRYSTAL-FACE Science Team, May 2003

NASA Group Achievement Award: SAFARI 2000 International Leadership Team, December 2002

Best Senior Author Publication Award, Laboratory for Atmospheres, NASA GSFC, July 2001

Other Professional Information

Google Scholar:

Special Experience


NASA Goddard Space Flight Center, Earth Science Division (Dec. 2002 – present)

Deputy Director for Atmospheres (January 2015 – present)

EOS Senior Project Scientist (April 2008 – present)

Afternoon Constellation (A-Train) Project Scientist (Dec. 2009 – 2023)

Aqua Deputy Project Scientist (Jan. 2003 – Feb. 2010)

GEWEX Cloud Assessment Working Group (2008 – present)

EUMETSAT Cloud Assessment Working Group (CREW) (2009–present)

NASA Observations for Modeling Intercomparison Studies (Obs4MIPS) Working Group (Dec. 2011)

Texas A&M University: Adjunct faculty, Dept. of Atmospheric Sciences (Dec. 2005–present)

University of Wisconsin, Madison: Affiliate faculty, Dept. of Atmospheric & Oceanic Sciences, 2009–present.

Current/Recent Science Team Participation

ORACLES EVS-2 Science Team (2014 – present)

DSCOVR Science Team (2014 – present)

PACE Science Team (2014 – present)

PACE Science Definition Team, Deputy Chair (Oct. 2011 – Sept. 2012)

NPP Cloud/Aerosol Discipline Science Team Lead (Apr. 2012 – Aug. 2014)

NPP Science Team (2011–present)

MODIS Atmosphere Discipline Science Team Lead (Dec. 2009 – present)

MODIS Science Team (most recently, 2010–present)

Glory Science Team (2010 – 2014)

ACE Science Definition Team (Cloud Working Group, 2009–2011)

GOES-R ABI Cloud Team (2005–2009)

Major Airborne Field Campaign Participation

ARCSIX Science Team (2023-present)

ORACLES Science Team (2015 – present)

SEAC4RS Science Team (2011 – 2015)

TC4 Science Management Team, ER-2 co-flight scientist: 2007

CRYSTAL-FACE Science Management Team, ER-2 co-flight scientist: 2002

SAFARI (ER-2 co-flight scientist): 2000

FIRE-ACE (ER-2 co-flight scientist): 1998

MAST (ER-2 co-flight scientist): 1994

ACE: 1992



2023. "Updated observations of clouds by MODIS for global model assessment." Earth System Science Data [] [Journal Article/Letter]

2023. "Observational evidence of strong forcing from aerosol effect on low cloud coverage." Science Advances 9 (45): eadh7716 [10.1126/sciadv.adh7716] [Journal Article/Letter]

2022. "Machine learning reveals climate forcing from aerosols is dominated by increased cloud cover." Nature Geoscience [10.1038/s41561-022-00991-6] [Journal Article/Letter]

2022. "Global reduction in ship-tracks from sulfur regulations for shipping fuel." Science Advances 8 (29): [10.1126/sciadv.abn7988] [Journal Article/Letter]

2022. "Analysis of the MODIS above-cloud aerosol retrieval algorithm using MCARS." Geoscientific Model Development 15 (1): 1-14 [10.5194/gmd-15-1-2022] [Journal Article/Letter]

2021. "An overview of the ORACLES (ObseRvations of Aerosols above CLouds and their intEractionS) project: aerosol-cloud-radiation interactions in the Southeast Atlantic basin." Atmospheric Chemistry and Physics [10.5194/acp-21-1507-2021] [Journal Article/Letter]

2020. "The NASA MODIS-VIIRS Continuity Cloud Optical Properties Products." Remote Sensing 13 (1): 2 [10.3390/rs13010002] [Journal Article/Letter]

2020. "Applying deep learning to NASA MODIS data to create a community record of marine low-cloud mesoscale morphology." Atmospheric Measurement Techniques 13 (12): 6989-6997 [10.5194/amt-13-6989-2020] [Journal Article/Letter]

2020. "Sensitivity of Multispectral Imager Liquid Water Cloud Microphysical Retrievals to the Index of Refraction." Remote Sensing 12 (24): 4165 [10.3390/rs12244165] [Journal Article/Letter]

2020. "Derivation of Shortwave Radiometric Adjustments for SNPP and NOAA-20 VIIRS for the NASA MODIS-VIIRS Continuity Cloud Products." Remote Sensing 12 (24): 4096 [10.3390/rs12244096] [Journal Article/Letter]

2020. "A machine-learning-based cloud detection and thermodynamic-phase classification algorithm using passive spectral observations." Atmospheric Measurement Techniques 13 (5): 2257-2277 [10.5194/amt-13-2257-2020] [Journal Article/Letter]

2020. "Evaluation of the Aqua MODIS Collection 6.1 multilayer cloud detection algorithm through comparisons with CloudSat CPR and CALIPSO CALIOP products." AMT [10.5194/amt-2019-448] [Journal Article/Letter]

2019. "Above-cloud aerosol radiative effects based on ORACLES 2016 and ORACLES 2017 aircraft experiments." Atmospheric Measurement Techniques 12 (12): 6505-6528 [10.5194/amt-12-6505-2019] [Journal Article/Letter]

2019. "A Fast Vector Radiative Transfer Model for the Atmosphere-Ocean Coupled System." Journal of Quantitative Spectroscopy and Radiative Transfer 239 106667 [10.1016/j.jqsrt.2019.106667] [Journal Article/Letter]

2019. "The CHIMAERA system for retrievals of cloud top, optical and microphysical properties from imaging sensors." Computers & Geosciences 134 104345 [10.1016/j.cageo.2019.104345] [Journal Article/Letter]

2019. "Observation of absorbing aerosols above clouds over the south-east Atlantic Ocean from the geostationary satellite SEVIRI – Part 1: Method description and sensitivity." Atmospheric Chemistry and Physics 19 (14): 9595-9611 [10.5194/acp-19-9595-2019] [Journal Article/Letter]

2019. "Automatically Finding Ship-tracks to Enable Large-scale Analysis of Aerosol-Cloud Interactions." Geophysical Research Letters [10.1029/2019gl083441] [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. "An Assessment of the Impacts of Cloud Vertical Heterogeneity on Global Ice Cloud Data Records From Passive Satellite Retrievals." Journal of Geophysical Research: Atmospheres [10.1029/2018jd029681] [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. "Improving cloud optical property retrievals for partly cloudy pixels using coincident higher-resolution single band measurements: A feasibility study using ASTER observations." Journal of Geophysical Research: Atmospheres [10.1029/2018jd028902] [Journal Article/Letter]

2018. "Cirrus Horizontal Heterogeneity and 3-D Radiative Effects on Cloud Optical Property Retrievals From MODIS Near to Thermal Infrared Channels as a Function of Spatial Resolution." Journal of Geophysical Research: Atmospheres 123 (19): 11,141-11,153 [10.1029/2018jd028726] [Journal Article/Letter]

2018. "MODIS Retrievals of Cloud Effective Radius in Marine Stratocumulus Exhibit No Significant Bias." Geophysical Research Letters 45 (19): 10,656-10,664 [10.1029/2018gl079325] [Journal Article/Letter]

2018. "Scale dependence of cirrus heterogeneity effects. Part II: MODIS NIR and SWIR channels." Atmospheric Chemistry and Physics 18 (16): 12105-12121 [10.5194/acp-18-12105-2018] [Journal Article/Letter]

2018. "Comparisons of bispectral and polarimetric retrievals of marine boundary layer cloud microphysics: case studies using a LES–satellite retrieval simulator." Atmospheric Measurement Techniques 11 (6): 3689-3715 [10.5194/amt-11-3689-2018] [Journal Article/Letter]

2018. "Quantifying the Impacts of Subpixel Reflectance Variability on Cloud Optical Thickness and Effective Radius Retrievals Based On High-Resolution ASTER Observations." Journal of Geophysical Research: Atmospheres 123 (8): 4239-4258 [10.1002/2017jd027916] [Journal Article/Letter]

2018. "Observations of Local Positive Low Cloud Feedback Patterns and Their Role in Internal Variability and Climate Sensitivity." Geophysical Research Letters 45 (9): 4438-4445 [10.1029/2018gl077904] [Journal Article/Letter]

2018. "Satellites See the World’s Atmosphere." Meteorological Monographs 59 4.1-4.53 [10.1175/amsmonographs-d-18-0009.1] [Journal Article/Letter]

2018. "The Earth Observing System (EOS)." Comprehensive Remote Sensing 7-26 [10.1016/b978-0-12-409548-9.10312-4] [Article in Book]

2017. "Scale dependence of cirrus horizontal heterogeneity effects on TOA measurements – Part I: MODIS brightness temperatures in the thermal infrared." Atmospheric Chemistry and Physics 17 (13): 8489-8508 [10.5194/acp-17-8489-2017] [Journal Article/Letter]

2017. "Strong constraints on aerosol–cloud interactions from volcanic eruptions." Nature 546 (7659): 485-491 [10.1038/nature22974] [Journal Article/Letter]

2017. "Seasonally transported aerosol layers over southeast Atlantic are closer to underlying clouds than previously reported." Geophysical Research Letters [10.1002/2017gl073559] [Journal Article/Letter]

2017. "Validation of quasi-invariant ice cloud radiative quantities with MODIS satellite-based cloud property retrievals." Journal of Quantitative Spectroscopy and Radiative Transfer 194 47-57 [10.1016/j.jqsrt.2017.03.025] [Journal Article/Letter]

2017. "Intercomparisons of marine boundary layer cloud properties from the ARM CAP-MBL campaign and two MODIS cloud products." Journal of Geophysical Research: Atmospheres 122 (4): 2351-2365 [10.1002/2016jd025763] [Journal Article/Letter]

2017. " Cirrus heterogeneity effects on cloud optical properties retrieved with an optimal estimation method from MODIS VIS to TIR channels." AIP Conference Proceedings 1810 (1): [10.1063/1.4975504] [Proceedings]

2017. "A fast hybrid (3-D/1-D) model for thermal radiative transfer in cirrus via successive orders of scattering." Journal of Geophysical Research: Atmospheres 122 (1): 344-366 [10.1002/2016jd025607] [Journal Article/Letter]

2017. "The MODIS cloud optical and microphysical products: Collection 6 updates and examples from Terra and Aqua." IEEE Trans. Geosci. Remote Sens. 55 (1): 502–525 [10.1109/TGRS.2016.2610522] [Journal Article/Letter]

2016. "Marine boundary layer cloud property retrievals from high-resolution ASTER observations: case studies and comparison with Terra MODIS." Atmospheric Measurement Techniques 9 (12): 5869-5894 [10.5194/amt-9-5869-2016] [Journal Article/Letter]

2016. "Measuring cloud thermodynamic phase with shortwave infrared imaging spectroscopy." Journal of Geophysical Research: Atmospheres 121 (15): 9174-9190 [10.1002/2016jd024999] [Journal Article/Letter]

2016. "Polarized view of supercooled liquid water clouds." Remote Sensing of Environment 181 96-110 [10.1016/j.rse.2016.04.002] [Journal Article/Letter]

2016. "Multi-sensor cloud and aerosol retrieval simulator and remote sensing from model parameters – Part 2: Aerosols." Geosci. Model Dev. 9 (7): 2377-2389 [10.5194/gmd-9-2377-2016] [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. "Degree of ice particle surface roughness inferred from polarimetric observations." Atmos. Chem. Phys. 16 (12): 7545-7558 [10.5194/acp-16-7545-2016] [Journal Article/Letter]

2016. "Retrieval of ice cloud properties using an optimal estimation algorithm and MODIS infrared observations: 1. Forward model, error analysis, and information content." J. Geophys. Res. Atmos. 121 (10): 5809-5826 [10.1002/2015jd024526] [Journal Article/Letter]

2016. "Uncertainties in cloud phase and optical thickness retrievals from the Earth Polychromatic Imaging Camera (EPIC)." Atmospheric Measurement Techniques 9 (4): 1785-1797 [10.5194/amt-9-1785-2016] [Journal Article/Letter]

2016. "The impact of cloud vertical profile on liquid water path retrieval based on the bispectral method: A theoretical study based on large-eddy simulations of shallow marine boundary layer clouds." Journal of Geophysical Research: Atmospheres 121 (8): 4122-4141 [10.1002/2015jd024322] [Journal Article/Letter]

2016. "Resolving ice cloud optical thickness biases between CALIOP and MODIS using infrared retrievals." Atmos. Chem. Phys. 16 (8): 5075-5090 [10.5194/acp-16-5075-2016] [Journal Article/Letter]

2016. "Retrieval of ice cloud properties using an optimal estimation algorithm and MODIS infrared observations: 2. Retrieval evaluation." J. Geophys. Res. Atmos. 121 [10.1002/2015jd024528] [Journal Article/Letter]

2016. "Cirrus cloud optical and microphysical property retrievals from eMAS during SEAC4RS using bi-spectral reflectance measurements within the 1.88  µm water vapor absorption band." Atmospheric Measurement Techniques 9 (4): 1743-1753 [10.5194/amt-9-1743-2016] [Journal Article/Letter]

2016. "MODIS Collection 6 shortwave-derived cloud phase classification algorithm and comparisons with CALIOP." Atmospheric Measurement Techniques 9 (4): 1587-1599 [10.5194/amt-9-1587-2016] [Journal Article/Letter]

2016. "Shortwave direct radiative effects of above-cloud aerosols over global oceans derived from 8 years of CALIOP and MODIS observations." Atmos. Chem. Phys. 16 (5): 2877-2900 [10.5194/acp-16-2877-2016] [Journal Article/Letter]

2016. "Positive low cloud and dust feedbacks amplify tropical North Atlantic multidecadal oscillation." Geophysical Research Letters 43 (3): 1349–1356 [10.1002/2016gl067679] [Journal Article/Letter]

2016. "Ice cloud backscatter study and comparison with CALIPSO and MODIS satellite data." Optics Express 24 (1): 620 [10.1364/oe.24.000620] [Journal Article/Letter]

2015. "Pixel-scale assessment and uncertainty analysis of AIRS and MODIS ice cloud optical thickness and effective radius." J. Geophys. Res. Atmos. 120 (22): 11,669-11,689 [10.1002/2015jd023950] [Journal Article/Letter]

2015. "Simultaneously inferring above-cloud absorbing aerosol optical thickness and underlying liquid phase cloud optical and microphysical properties using MODIS." J. Geophys. Res. Atmos 120 (11): 5524–5547 [10.1002/2015JD023128] [Journal Article/Letter]

2015. "Retrieval of Cirrus Cloud Optical Depth under Day and Night Conditions from MODIS Collection 6 Cloud Property Data." Remote Sensing 7 (6): 7257-7271 [10.3390/rs70607257] [Journal Article/Letter]

2015. "Frequency and causes of failed MODIS cloud property retrievals for liquid phase clouds over global oceans." J. Geophys. Res.-Atmos 120 (9): 4132-4154 [10.1002/2015JD023161] [Journal Article/Letter]

2015. "A fast Visible Infrared Imaging Radiometer Suite simulator for cloudy atmospheres." J. Geophys. Res. Atmos. 120 (1): 240-255 [10.1002/2014jd022443] [Journal Article/Letter]

2015. "Liquid water cloud properties during the Polarimeter Definition Experiment (PODEX)." Remote Sens. Environ. 169 20-36 [doi:10.1016/j.rse.2015.07.029] [Journal Article/Letter]

2014. "Scientific impact of MODIS C5 calibration degradation and C6+ improvements." Atmos. Meas. Tech. 7 4353-4365 [10.5194/amt-7-4353-2014] [Journal Article/Letter]

2014. "Remote sensing of cloud top pressure/height from SEVIRI: analysis of ten current retrieval algorithms." Atmos. Meas. Tech. 7 2839-2867 [10.5194/amt-7-2839-2014] [Journal Article/Letter]

2014. "A novel method for estimating shortwave direct radiative effect of above-cloud aerosols using CALIOP and MODIS data." Atmos. Meas. Tech. 7 (6): 1777-1789 [10.5194/amt-7-1777-2014] [Journal Article/Letter]

2013. "Global analysis of aerosol properties above clouds." Geophysical Research Letters 40 (21): 5809-5814 [10.1002/2013gl057482] [Journal Article/Letter]

2013. "A fast radiative transfer model for visible through shortwave infrared spectral reflectances in clear and cloudy atmospheres." Journal of Quantitative Spectroscopy and Radiative Transfer 116 122-131 [10.1016/j.jqsrt.2012.10.012] [Journal Article/Letter]

2013. "Comparison of PARASOL Observations with Polarized Reflectances Simulated Using Different Ice Habit Mixtures." Journal of Applied Meteorology and Climatology 52 (1): 186-196 [10.1175/jamc-d-12-097.1] [Journal Article/Letter]

2013. "Estimating the direct radiative effect of absorbing aerosols overlying marine boundary layer clouds in the southeast Atlantic using MODIS and CALIOP." J. Geophys. Res. Atmos. 118 (10): 4801-4815 [10.1002/jgrd.50449] [Journal Article/Letter]

2013. "Multi-sensor cloud retrieval simulator and remote sensing from model parameters – Part 1: Synthetic sensor radiance formulation." Geosci. Model Dev. 6 (6): 2049-2062 [10.5194/gmd-6-2049-2013] [Journal Article/Letter]

2013. "Assessment of Global Cloud Datasets from Satellites: Project and Database Initiated by the GEWEX Radiation Panel." Bull. Amer. Meteor. Soc. 94 (7): 1031-1049 [10.1175/BAMS-D-12-00117.1] [Journal Article/Letter]

2013. "Spatial and temporal distribution of clouds observed by MODIS onboard the Terra and Aqua satellites." IEEE Transactions on Geoscience and Remote Sensing 51 3826-3852 [Journal Article/Letter]

2013. "Retrieval of Ice Cloud Properties from AIRS and MODIS Observations Based on a Fast High-Spectral-Resolution Radiative Transfer Model." Journal of Applied Meteorology and Climatology 52 (3): 710-726 [10.1175/JAMC-D-12-020.1] [Journal Article/Letter]

2012. "Fog- and cloud-induced aerosol modification observed by the Aerosol Robotic Network (AERONET)." J Geophys Res 117 (D7): D07206 [10.1029/2011JD016839] [Journal Article/Letter]

2012. "Reconciling Simulated and Observed Views of Clouds: MODIS, ISCCP, and the Limits of Instrument Simulators." J Climate 25 (13): 4699-4720 [10.1175/JCLI-D-11-00267.1] [Journal Article/Letter]

2012. "Effects of cloud horizontal inhomogeneity and drizzle on remote sensing of cloud droplet effective radius: Case studies based on large-eddy simulations." J Geophys Res 117 (D19): D19208 [10.1029/2012JD017655] [Journal Article/Letter]

2011. "Retrieval of Ice Cloud Optical Thickness and Effective Particle Size Using a Fast Infrared Radiative Transfer Model." Journal of Applied Meteorology and Climatology 50 (11): 2283-2297 [10.1175/jamc-d-11-067.1] [Journal Article/Letter]

2011. "An assessment of differences between cloud effective particle radius retrievals for marine water clouds from three MODIS spectral bands." Journal of Geophysical Research 116 (D20): D20215 [10.1029/2011jd016216] [Journal Article/Letter]

2011. "Influence of convection and aerosol pollution on ice cloud particle effective radius." Atmos. Chem. Phys. 11 (2): 457-463 [10.5194/acp-11-457-2011] [Journal Article/Letter]

2010. "Utilizing the MODIS 1.38 μ m channel for cirrus cloud optical thickness retrievals: Algorithm and retrieval uncertainties." J. Geophys. Res. 115 (D24): D24209 [10.1029/2010JD014872] [Journal Article/Letter]

2010. "Cloud thermodynamic phase inferred from merged POLDER and MODIS data." Atmospheric Chemistry and Physics 10 (23): 11851-11865 [10.5194/acp-10-11851-2010] [Journal Article/Letter]

2010. "Detecting opaque and nonopaque tropical upper tropospheric ice clouds: A trispectral technique based on the MODIS 8–12μm window bands." Journal of Geophysical Research 115 (D20): D20214 [10.1029/2010jd014004] [Journal Article/Letter]

2010. "Remote Sensing of Terrestrial Clouds from Space using Backscattering and Thermal Emission Techniques." The Remote Sensing of Tropospheric Composition from Space 231-257 [10.1007/978-3-642-14791-3_5] [Article in Book]

2010. "Observations and modeling of ice cloud shortwave spectral albedo during the Tropical Composition, Cloud and Climate Coupling Experiment (TC4)." Journal of Geophysical Research 115 D00J18 [10.1029/2009jd013127] [Journal Article/Letter]

2010. "Effects of ice particle size vertical inhomogeneity on the passive remote sensing of ice clouds." Journal of Geophysical Research 115 (D17): D17203 [10.1029/2010jd013835] [Journal Article/Letter]

2010. "A global view of one-dimensional solar radiative transfer through oceanic water clouds." Geophysical Research Letters 37 (18): [10.1029/2010gl044094] [Journal Article/Letter]

2010. "Examining the impact of overlying aerosols on the retrieval of cloud optical properties from passive remote sensing." Journal of Geophysical Research 115 (D10): D10211 [10.1029/2009jd012829] [Journal Article/Letter]

2010. "Remote sensing of radiative and microphysical properties of clouds during TC⁴ : Results from MAS, MASTER, MODIS, and MISR." J. Geophys. Res. 115 D00J07 [10.1029/2009JD013277] [Journal Article/Letter]

2010. "Apparent absorption of solar spectral irradiance in heterogeneous ice clouds." J. Geophys. Res. 115 (D10): D00J22 [10.1029/2009JD013124] [Journal Article/Letter]

2010. "Viewing Geometry Dependencies in MODIS Cloud Products." J Atmos Oceanic Tech 27 (9): 1519-1528 [10.1175/2010JTECHA1432.1] [Journal Article/Letter]

2010. "Detection of multi-layer and vertically-extended clouds using A-train sensors." Atmos Meas Tech 3 (1): 233-247 [10.5194/amt-3-233-2010] [Journal Article/Letter]

2010. "Multilayer Cloud Detection with the MODIS Near-Infrared Water Vapor Absorption Band." J. Appl. Meteor. Climatol. 49 (11): 2315-2333 [10.1175/2010JAMC2364.1] [Journal Article/Letter]

2010. "Planning, implementation, and first results of the Tropical Composition, Cloud and Climate Coupling Experiment (TC4)." J. Geophys. Res. 115 D00J04 [10.1029/2009JD013073] [Journal Article/Letter]

2010. "Testing remote sensing on artificial observations: impact of drizzle and 3-D cloud structure on effective radius retrievals." Atmos. Chem. Phys. 10 (19): 9535-9549 [10.5194/acp-10-9535-2010] [Journal Article/Letter]

2009. "Distribution and Radiative Forcing of Tropical Thin Cirrus Clouds." Journal of the Atmospheric Sciences 66 (12): 3721-3731 [10.1175/2009jas3183.1] [Journal Article/Letter]

2009. "View-angle consistency in reflectance, optical thickness and spherical albedo of marine water-clouds over the northeastern Pacific through MISR-MODIS fusion." Geophysical Research Letters 36 (9): L09811 [10.1029/2008gl037124] [Journal Article/Letter]

2009. "Estimate of the impact of absorbing aerosol over cloud on the MODIS retrievals of cloud optical thickness and effective radius using two independent retrievals of liquid water path." J. Geophys. Res. 114 (D5): D05210 [10.1029/2008JD010589] [Journal Article/Letter]

2009. "The Shortwave Radiative Forcing Bias of Homogeneous Liquid and Ice Clouds Observed by MODIS." [PowerPoint slides] Retrieved from Current Problems in Atmospheric Radiation (IRS 2008 Proceedings) [10.1063/1.3117049] [Journal Article/Letter]

2009. "Cloud ice: A climate model challenge with signs and expectations of progress." J. Geophys. Res. 114 D00A21 [10.1029/2008JD010015] [Journal Article/Letter]

2009. "The Fog Remote Sensing and Modeling Field Project." Bull Amer Meteor Soc 90 (3): 341-359 [10.1175/2008BAMS2354.1] [Journal Article/Letter]

2009. "Exploring the differences in cloud properties observed by the Terra and Aqua MODIS Sensors." Atmos. Chem. Phys. 9 (10): 3461-3475 [10.5194/acp-9-3461-2009] [Journal Article/Letter]

2009. "Influence of ice particle model on satellite ice cloud retrieval: lessons learned from MODIS and POLDER cloud product comparison." Atmos. Chem. Phys. 9 (18): 7115-7129 [10.5194/acp-9-7115-2009] [Journal Article/Letter]

2009. "The shortwave radiative forcing bias of liquid and ice clouds from MODIS observations." Atmos. Chem. Phys. 9 (16): 5865-5875 [10.5194/acp-9-5865-2009] [Journal Article/Letter]

2009. "Accurate satellite-derived estimates of the tropospheric ozone impact on the global radiation budget." Atmos. Chem. Phys. 9 (13): 4447-4465 [10.5194/acp-9-4447-2009] [Journal Article/Letter]

2009. "On the importance of small ice crystals in tropical anvil cirrus." Atmos. Chem. Phys. 9 (15): 5519-5537 [10.5194/acp-9-5519-2009] [Journal Article/Letter]

2009. "Aerosol-CO relationship and aerosol effect on ice cloud particle size: Analyses from Aura Microwave Limb Sounder and Aqua Moderate Resolution Imaging Spectroradiometer observations." J. Geophys. Res. 114 (D20): D20707 [10.1029/2009JD012421] [Journal Article/Letter]

2009. "Sensitivity of photolysis frequencies and key tropospheric oxidants in a global model to cloud vertical distributions and optical properties." J. Geophys. Res. 114 (D10): D10305 [10.1029/2008JD011503] [Journal Article/Letter]

2009. "Impact of tropospheric nitrogen dioxide on the regional radiation budget." Atmos Chem Phys 9 6389-6400 [10.5194/acp-9-6389-2009] [Journal Article/Letter]

2008. "Clean and polluted clouds: Relationships among pollution, ice clouds, and precipitation in South America." Geophysical Research Letters 35 (14): L14804 [10.1029/2008gl034631] [Journal Article/Letter]

2008. "Radiative susceptibility of cloudy atmospheres to droplet number perturbations: 2. Global analysis from MODIS ." J. Geophys. Res. 113 (D14S21): 10.1029/2007JD009655 [Journal Article/Letter]

2008. "Radiative susceptibility of cloudy atmospheres to droplet number perturbations: 1. Theoretical analysis and examples from MODIS." J. Geophys. Res. 113 (D14S20): 10.1029/2007JD009654 [Journal Article/Letter]

2008. "MODIS-Derived Spatially Complete Surface Albedo Products: Spatial and Temporal Pixel Distribution and Zonal Averages." J Appl Meteor Climatol 47 (11): 2879-2894 [10.1175/2008JAMC1795.1] [Journal Article/Letter]

2008. "Model Calculations of Solar Spectral Irradiance in the 3.7- μ m Band for Earth Remote Sensing Applications." Journal of Applied Meteorology and Climatology 47 (1): 124-134 [10.1175/2007JAMC1571.1] [Journal Article/Letter]

2007. "Comparing irradiance fields derived from Moderate Resolution Imaging Spectroradiometer airborne simulator cirrus cloud retrievals with solar spectral flux radiometer measurements." Journal of Geophysical Research 112 (D24): D24206 [10.1029/2007jd008711] [Journal Article/Letter]

2007. "High cloud properties from three years of MODIS Terra and Aqua collection-4 data over the tropics." J Appl Meteor Climatol 46 1840-1856 [10.1175/2007JAMC1583.1] [Journal Article/Letter]

2007. "Differences between collection 4 and 5 MODIS ice cloud optical/microphysical products and their impact on radiative forcing simulations." IEEE Trans Geosci Remote Sens 45 (9): 2886-2899 [10.1109/TGRS.2007.898276] [Journal Article/Letter]

2007. "The sensitivity of ice cloud optical and microphysical passive satellite retrievals to cloud geometrical thickness." IEEE Trans Geosci Remote Sens 45 (5): 1315-1323 [10.1109/TGRS.2007.894549] [Journal Article/Letter]

2007. "The Plane-Parallel Albedo Bias of Liquid Clouds from MODIS Observations." J. Climate 20 (20): 5114-5125 [10.1175/JCLI4305.1] [Journal Article/Letter]

2007. "Comparison of CALIPSO-Like, LaRC, and MODIS Retrievals of Ice-Cloud Properties over SIRTA in France and Florida during CRYSTAL-FACE." J Appl Meteor Clim 46 (3): 249-272 [10.1175/JAM2435.1] [Journal Article/Letter]

2007. "Northern Hemisphere five-year average (2000–2004) spectral albedos of surfaces in the presence of snow: Statistics computed from Terra MODIS land products." Remote Sensing of Environment 111 (2-3): 337-345 [10.1016/j.rse.2007.03.026] [Journal Article/Letter]

2006. "Radiative effect of clouds on tropospheric chemistry in a global three-dimensional chemical transport model." Journal of Geophysical Research 111 (D20): D20303 [10.1029/2005jd006403] [Journal Article/Letter]

2006. "The influence of thermodynamic phase on the retrieval of mixed-phase cloud microphysical and optical properties in the visible and near-infrared region." IEEE Geosci Remote Sens Lett 3 (3): 287-291 [10.1109/LGRS.2006.864374] [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]

2005. "Bulk scattering properties for the remote sensing of ice clouds. Part II: Narrowband models." J Appl Meteor 44 (12): 1896-1911 [10.1175/JAM2309.1] [Journal Article/Letter]

2005. "Evaluation of cirrus cloud properties derived from MODIS data using cloud properties derived from ground-based observations collected at the ARM SGP site." J Appl Meteor 44 221-240 [10.1175/JAM2193.1] [Journal Article/Letter]

2005. "Spatially complete global spectral surface albedos: Value-Added datasets derived from Terra MODIS land products." IEEE Trans Geosci Remote Sens 43 (1): 144-158 [10.1109/TGRS.2004.838359] [Journal Article/Letter]

2004. "Trade wind cumuli statistics in clean and polluted air over the Indian Ocean from in situ and remote sensing measurements." Geophysical Research Letters 31 (21): L21105 [10.1029/2004gl020412] [Journal Article/Letter]

2004. "Retrieval of semitransparent ice cloud optical thickness from Atmospheric Infrared Sounder (AIRS) measurements." IEEE Trans Geosci Remote Sens 42 (10): 2254-2266 [10.1109/TGRS.2004.833780] [Journal Article/Letter]

2004. "Remote sensing of liquid water and ice cloud optical thickness and effective radius in the Arctic: Application of airborne multispectral MAS data." J Atmos Oceanic Technol 21 857-875 [10.1175/1520-0426(2004)021<0857:RSOLWA>2.0.CO;2] [Journal Article/Letter]

2003. "The MODIS cloud products: Algorithms and examples from Terra." IEEE Trans Geosci Remote Sens 41 (2): 459-473 [10.1109/TGRS.2002.808301] [Journal Article/Letter]

2003. "Cloud and aerosol properties, precipitable water, and profiles of temperature and water vapor from MODIS." IEEE Trans Geosci Remote Sens 41 (2): 442-458 [10.1109/TGRS.2002.808226] [Journal Article/Letter]

2003. "Africa burning: A thematic analysis of the Southern African Regional Science Initiative (SAFARI 2000)." J. Geophys. Res. 108 (D13): 8465 [10.1029/2003JD003747] [Journal Article/Letter]

2003. "Remote sensing of smoke, land and clouds from the NASA ER-2 during SAFARI 2000." J. Geophys. Res. 108(D13) 8502 10.1029/2002JD003207 [Journal Article/Letter]

2003. "Airborne spectral measurements of surface–atmosphere anisotropy for several surfaces and ecosystems over southern Africa." J. Geophys. Res. 108 (D13): 8489 [10.1029/2002JD002397] [Journal Article/Letter]

2002. "Inherent and Apparent Scattering Properties of Coated or Uncoated Spheres Embedded in an Absorbing Host Medium." Applied Optics 41 (15): 2740-2759 [10.1364/AO.41.002740] [Journal Article/Letter]

2002. "The Southern African Regional Science Initiative (SAFARI 2000): Overview of the dry season field campaign." South African Journal of Science 98 125-130 [Journal Article/Letter]

2001. "A superposition technique for deriving photon scattering statistics in plane-parallel cloudy atmospheres." J Quant Spectr and Rad Trans 68 (1): 57-73 [10.1016/S0022-4073(00)00015-7] [Journal Article/Letter]

2001. "Approximations for horizontal photon transport in cloud remote sensing problems." J Quant Spectr and Rad Trans 68 (1): 75-99 [10.1016/S0022-4073(00)00016-9] [Journal Article/Letter]

2001. "A solar reflectance method for retrieving the optical thickness and droplet size of liquid water clouds over snow and ice surfaces." J Geophys Res 106 (D14): 15185-15199 [10.1029/2000JD900441] [Journal Article/Letter]

2000. "Vertical photon transport in cloud remote sensing problems." J Geophys Res 105 (D18): 22919-22935 [10.1029/2000JD900333] [Journal Article/Letter]

2000. "The effects of aerosols on the radiative properties of clouds." J Atmos Sci 57 2656-2670 [10.1175/1520-0469(2000)057<2656:EOAOTR>2.0.CO;2] [Journal Article/Letter]

2000. "The role of background cloud microphysics in the radiative formation of ship tracks." J Atmos Sci 57 2607-2624 [10.1175/1520-0469(2000)057<2607:TROBCM>2.0.CO;2] [Journal Article/Letter]

2000. "Composite ship track characteristics." J Atmos Sci 57 (16): 2542-2553 [10.1175/1520-0469(2000)057<2542:CSTC>2.0.CO;2] [Journal Article/Letter]

2000. "The appearance and disappearance of ship tracks on large spatial scales." J Atmos Sci 57 2765-2778 [10.1175/1520-0469(2000)057<2765:TAADOS>2.0.CO;2] [Journal Article/Letter]

1996. "Airborne Scanning Spectrometer for Remote Sensing of Cloud, Aerosol, Water Vapor, and Surface Properties." J. Atmos. Oceanic Technol. 13 (4): 777-794 [10.1175/1520-0426(1996)013<0777:ASSFRS>2.0.CO;2] [Journal Article/Letter]

1995. "A Validation of a Satellite Cloud Retrieval during ASTEX." Journal of the Atmospheric Sciences 52 (16): 2985-3001 [10.1175/1520-0469(1995)052<2985:avoasc>;2] [Journal Article/Letter]

1995. "In Situ Observations of the Indirect Effects of Aerosol on Clouds." in Aerosol Forcing of Climate John Wiley and Sons 227-248 [Journal Article/Letter]

1994. "Remote sensing the susceptibility of cloud albedo to changes in drop concentration." Atmospheric Research 34 (1-4): 85-98 [10.1016/0169-8095(94)90082-5] [Journal Article/Letter]

1994. "Determining the Susceptibility of Cloud Albedo to Changes in Droplet Concentration with the Advanced Very High Resolution Radiometer." Journal of Applied Meteorology 33 (3): 334-347 [10.1175/1520-0450(1994)033<0334:dtsoca>;2] [Journal Article/Letter]

1993. "Airborne brightness temperature measurements of the polar winter troposphere as part of the Airborne Arctic Stratosphere Experiment II and the effect of brightness temperature variations on the diabatic heating in the lower stratosphere." Geophysical Research Letters 20 (22): 2575-2578 [10.1029/93gl03003] [Journal Article/Letter]

1983. "BISTATIC PHASE MEASUREMENTS." Electromagnetics 3 (1): 77-84 [10.1080/02726348308915177] [Journal Article/Letter]

. "Comparisons of bispectral and polarimetric cloud microphysical retrievals using LES-Satellite retrieval simulator." Atmospheric Measurement Techniques Discussions 1-38 [10.5194/amt-2017-325] [Journal Article/Letter]


2015. "MODIS Terra-Aqua C6+ Cross-Calibration Improvements ." GSICS Quarterly 9 (2): [10.7289/V5XK8CHN] [Newsletter]

2014. "Spectral dependence of MODIS cloud droplet effective radius retrievals for marine boundary layer clouds." Light Scattering Reviews 9 135-165 [10.1007/978-3-642-37985-7_4] [Article in Book]

2006. "Introduction to MODIS Cloud Products." Earth Science Satellite Remote Sensing 74-91 [10.1007/978-3-540-37293-6_5] [Article in Book]

2006. "Ship Tracks." Our Changing Planet [Article in Book]