The MOD04 algorithms were developed in late 1990s by the international team of scientists (NASA GSFC, United States, and Laboratoire d’Optique Atmospherique, University of Lille, France) under energetic and enthusiastic leadership of Yoram Kaufman. The A-product retrievals were initiated in late 1980s by Nagaraja Rao (deceased) and Larry Stowe (retired) at NOAA/NESDIS following the pioneering ideas by Michael Griggs proposed in mid-1970s. The A product has been enhanced and applied to other sensor data (TRMM VIRS, and Terra/Aqua MODIS) under the CERES project. The authors are indebted to Jack Xiong, Bill Barnes, Bruce Guenther (NASA GSFC-MCST), Chris Moeller (University of Wisconsin—Madison), Kurt Thome (The University of Arizona), and Chagyong Cao and Jerry Sullivan (NOAA/NESDIS) for helpful discussions of the MODIS radiometric issues. Help and advice from Richard Hucek, Shana Mattoo, Allen Chu, Rob Levy, Rong-Rong Li, Vincent Chiang, and Gwyn Fireman (NASA GSFC), and Qing Trepte and Robert Arduini (NASA LaRC) is also appreciated. This work was funded under the NASA EOS/CERES (NASA Contract L-90987C), the Integrated Program Office (IPO/NOAA/NASA/DOD), NOAA Ocean Remote Sensing, and Joint Center for Satellite Data Assimilation (NOAA/NESDIS) Programs. We thank Steve Mango (IPO) and Bill Pichel and Fuzhong Weng (NOAA/NESDIS) for their support and encouragement. The Terra CERES SSF data used in this study were obtained from the Atmospheric Sciences Data Center at NASA Langley Research Center. Thoughtful and constructive reviews by Tom Charlock and Bill Smith Jr. (NASA LaRC), and by two anonymous reviewers were instrumental for improved style and clarity of presentation. The views, opinions, and findings contained in this report are those of the authors and should not be construed as an official NOAA or U.S. Government position, policy, or decision.
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