Sorry, you need to enable JavaScript to visit this website.
Landsat 7 Landsat 8 Suomi NPP Aura

Recent Imagery

You will be directed to the NASA Visible Earth webpage when you select Images by Mission below, or click on the images at right that are randomly generated to represent four out of all possible topics.

You are here



Dr. Si-Chee Tsay
Deputy Terra Project Scientist

Mailing Address: 

Code 613
NASA/Goddard Space Flight Center
Greenbelt, MD 20771


B.S. in Atmospheric Sciences from the National Taiwan University (Taipei, Taiwan) in 1977, and M.S. and Ph.D. in Atmospheric Sciences from the University of Alaska in 1982 and 1986, respec­tively. Joined Goddard Space Flight Center as a Physical Scientist in the Laboratory for Atmospheres since 1994. Visiting Scientist in the Universities Space Research Association, Goddard Space Flight Center, between 1990 and 1994, and Research Scientist in the Department of Atmospheric Science, Colorado State University (Fort Collins, Colorado) from 1986 to 1990. Appointed Adjunct Research Associate Professor at the Geophysical Institute, University of Alaska, 1992-1998, and Adjunct Professor at the Earth Systems Science Interdisciplinary Center, University of Maryland since 2002 and actively involved in M.S. and Ph.D. thesis advising. Awarded NASA Exceptional Scientific Achievement Medal in 2002 and NASA Outstanding Leadership Medal in 2008, among numerous achievement awards. Served as member of the FIRE/CRYSTAL-FACE, EOS/MODIS/CERES, DOE/ARM Science Teams, NASA/ESTO Spectrometry/Data-Compressing Team, EPA, ONR & NASA Aerosol Science Teams, and EOS/Terra deputy project scientist since 2000.
Authored over 100 papers published in refereed scientific journals, in addi­tion to many scientific/technical reports and book chapters. One paper has received frequent cita­tions since its publication in 1990 for the review of absorption of solar radiation by clouds. Another heavily cited (>1,200) paper/code is the 1988 theoretical radiative transfer algorithm in multiple scattering and emitting layered media. It was also selected in the SPIE Milestone Series on “Scattering in the Atmosphere.” This radiative transfer code (DisORT) and other (e.g., STRATS, AeroMie, etc.) first-class computer codes are freely distributed and widely used by the scientific communities.
Besides theoretical developments in radiative transfer (1-D and 2-D), recent research experience includes science planning and operating remote-sensing sensors and in-situ probes from suborbital platforms in field exper­iments to study aerosol, cloud and surface properties, and to aid in the development of atmospheric and land remote sensing and retrieval algorithms under NASAÕs Earth System Science projects. Building and deploying a suite of surface remote-sensing and in-situ instrumentation (, SMART, COMMIT, and ACHIEVE mobile laboratories) to compare and validate satellite measurements. Actively participated in many national and international field experiments in the past decade: PRIDE (Puerto RIco Dust Experiment), Puerto Rico, June-July 2000; SAFARI (Southern Africa Fire-Atmosphere Research Initiative), southern Africa, Aug-Sep 2000; ACE-Asia (Aerosol Characterization Experiment –Asia), eastern Asia, March-May 2001; CRYSTAL-FACE (Cirrus Regional Study of Tropical Anvils and Cirrus Layers – Florida Area Cirrus Experiment), Florida, July 2002; UAE2 (United Arab Emirates United Aerosol Experiment), Arabian Gulf, Aug-Sep 2004; EAST-AIRE (East Asian Study of Tropospheric Aerosols: an International Regional Experiment), China, Feb-July 2005; BASE-ASIA (Biomass-burning Aerosols in South East-Asia: Smoke Impact Assessment), Thailand, Feb-May 2006; NAMMA (NASA African Monsoon Multidisciplinary Activities), Cape Verde, Aug-Sep 2006; CHINA2-AMY08 (Cloud, Humidity Interacting Natural/Anthropogenic Aerosols in Asian Monsoon Year-2008), China, April-Oct 2008; RAJO-MEGHA (Radiation, Aerosol Joint Observations - Monsoon Experiment in Gangetic-Himalayas Area), Nepal and India, April-June 2009; 7-SEAS/Dongsha (7-South East Asian Stdies/Dongsha), Dongsha islands, Taiwan, March-June 2010.