Validation of ADEOS-II GLI ocean color products using in-situ observations

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 DupouyAbsornsuda Siripong, Satsuki Matsumura, Joji Ishizaka

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)373-393
Number of pages21
JournalJournal of Oceanography
Issue number3
Publication statusPublished - 2006 Jun
Externally publishedYes


  • ADEOS-2
  • Atmospheric correction
  • Chlorophyll
  • GLI
  • Match-up
  • Ocean color
  • Remote sensing
  • Validation

ASJC Scopus subject areas

  • Oceanography


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