Validation of ADEOS-II GLI ocean color products using in-situ observations |
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| Authors: | Hiroshi Murakami Kosei Sasaoka Kohtaro Hosoda Hajime Fukushima Mitsuhiro Toratani Robert Frouin B Greg Mitchell Mati Kahru Pierre-Yves Deschamps Dennis Clark Stephanie Flora Motoaki Kishino Sei-Ichi Saitoh Ichio Asanuma Akihiko Tanaka Hiroaki Sasaki Katsumi Yokouchi Yoko Kiyomoto Hiroaki Saito Cécile Dupouy Absornsuda Siripong Satsuki Matsumura Joji Ishizaka |
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| Institution: | (1) Earth Observation Research and Application Center, JAXA, Harumi, Chuo-ku, Tokyo 104-6023, Japan;(2) Frontier Research Center for Global Change, JAMSTEC, Showa-machi, Kanazawa-ku, Yokohama 236-0001, Japan;(3) School of High-Technology for Human Welfare, Tokai University, Numazu, Shizuoka 410-0395, Japan;(4) Scripps Institution of Oceanography, UCSD, La Jolla, CA, 92037, U.S.A.;(5) Laboratoire d’Optique Atmosphérique, Université des Sciences et Technologies de Lille, Villeneuve d’Asq. Cedex, France;(6) National Oceanic and Atmospheric Administration, National Environmental Satellite Service, Washington, D.C., 20233, U.S.A.;(7) Moss Landing Marine Labs, Moss Landing, CA, 95039, U.S.A.;(8) Marine Science, Tokyo University of Marine Science and Technology, Kohnan, Minato-ku, Tokyo 108-8477, Japan;(9) Fisheries Sciences and Faculty of Fisheries, Hokkaido University, Hakodate 041-8611, Japan;(10) Tokyo University of Information Sciences, Yato-cho, Wakaba-ku, Chiba 265-8501, Japan;(11) Nagasaki Industrial Promotion Foundation, Dejima-machi, Nagasaki 850-0862, Japan;(12) Fisheries Agency, Kasumigaseki, Chiyoda-ku, Tokyo 100-8907, Japan;(13) Seikai National Fisheries Research Institute, Fisheries Research Agency, Taira-machi, Nagasaki 851-2213, Japan;(14) Tohoku National Fisheries Research Institute, Fisheries Research Agency, Niihama, Shiogama, Miyagi 985-0001, Japan;(15) IRD UR103 CAMELIA, Centre d’Océanologie de Marseille, F-13007 Marseille, France;(16) Marine Science Department Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand;(17) Faculty of Fisheries, Nagasaki University, Bunkyo-machi, Nagasaki 852-8521, Japan |
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| Abstract: | The Global Imager (GLI) aboard the Advanced Earth Observing Satellite-II (ADEOS-II) made global observations from 2 April
2003 to 24 October 2003. In cooperation with several institutes and scientists, we obtained quality controlled match-ups between
GLI products and in-situ data, 116 for chlorophyll-a concentration (CHLA), 249 for normalized water-leaving radiance (nLw) at 443 nm, and 201 for
aerosol optical thickness at 865 nm (Tau_865) and Angstrom exponent between 520 and 865 nm (Angstrom). We evaluated the GLI
ocean color products and investigated the causes of errors using the match-ups. The median absolute percentage differences
(MedPD) between GLI and in-situ data were 14.1–35.7% for nLws at 380–565 nm, 52.5–74.8% nLws at 625–680 nm, 47.6% for Tau_865, 46.2% for Angstrom, and 46.6%
for CHLA, values that are comparable to the ocean-color products of other sensors. We found that some errors in GLI products
are correlated with observational conditions; nLw values were underestimated when nLw at 680 nm was high, CHLA was underestimated
in absorptive aerosol conditions, and Tau_865 was overestimated in sunglint regions. The error correlations indicate that
we need to improve the retrievals of the optical properties of absorptive aerosols and seawater and sea surface reflection
for further applications, including coastal monitoring and the combined use of products from multiple sensors. |
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| Keywords: | Remote sensing validation ocean color atmospheric correction chlorophyll ADEOS-2 GLI match-up |
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