TERRAPUB Journal of Oceanography

Journal of Oceanography, Vol. 62 (No. 3), pp. 373-393, 2006

Validation of ADEOS-II GLI Ocean Color Products Using In-Situ Observations

Hiroshi Murakami1*, Kosei Sasaoka2, Kohtaro Hosoda1, Hajime Fukushima3, Mitsuhiro Toratani3, Robert Frouin4, B. Greg Mitchell4, Mati Kahru4, Pierre-Yves Deschamps5, Dennis Clark6, Stephanie Flora7, Motoaki Kishino8, Sei-ichi Saitoh9, Ichio Asanuma10, Akihiko Tanaka11, Hiroaki Sasaki11, Katsumi Yokouchi12, Yoko Kiyomoto13, Hiroaki Saito14, Cécile Dupouy15, Absornsuda Siripong16, Satsuki Matsumura16 and Joji Ishizaka17

1Earth Observation Research and Application Center, JAXA, Harumi, Chuo-ku, Tokyo 104-6023, Japan
2Frontier Research Center for Global Change, JAMSTEC, Showa-machi, Kanazawa-ku, Yokohama 236-0001, Japan
3School of High-Technology for Human Welfare, Tokai University, Numazu, Shizuoka 410-0395, Japan
4Scripps Institution of Oceanography, UCSD, La Jolla, CA 92037, U.S.A.
5Laboratoire d'Optique Atmosphérique, Université des Sciences et Technologies de Lille, Villeneuve d'Asq. Cedex, France
6National Oceanic and Atmospheric Administration, National Environmental Satellite Service, Washington, D.C., 20233, U.S.A.
7Moss Landing Marine Labs, Moss Landing, CA 95039, U.S.A.
8Marine Science, Tokyo University of Marine Science and Technology, Kohnan, Minato-ku, Tokyo 108-8477, Japan
9Fisheries Sciences and Faculty of Fisheries, Hokkaido University, Hakodate 041-8611, Japan
10Tokyo University of Information Sciences, Yato-cho, Wakaba-ku, Chiba 265-8501, Japan
11Nagasaki Industrial Promotion Foundation, Dejima-machi, Nagasaki 850-0862, Japan
12Fisheries Agency, Kasumigaseki, Chiyoda-ku, Tokyo 100-8907, Japan
13Seikai National Fisheries Research Institute, Fisheries Research Agency, Taira-machi, Nagasaki 851-2213, Japan
14Tohoku National Fisheries Research Institute, Fisheries Research Agency, Niihama, Shiogama, Miyagi 985-0001, Japan
15IRD UR103 CAMELIA, Centre d'Océanologie de Marseille, F-13007 Marseille, France
16Marine Science Department Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
17Faculty of Fisheries, Nagasaki University, Bunkyo-machi, Nagasaki 852-8521, Japan

(Received 28 June 2005; in revised form 8 January 2006; accepted 7 February 2006)

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.

*Corresponding author E-mail: murakami@eorc.jaxa.jp

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