Atmospheric correction algorithm for satellite ocean color data over Asian waters

Hajime Fukushima; Mitsuhiro Toratani; Hiroshi Kobayashi; Wataru Takahashi; Akihiko Tanaka; Byung-Ju Sohn

doi:10.1117/12.411681

5 January 2001 Atmospheric correction algorithm for satellite ocean color data over Asian waters

Hajime Fukushima, Mitsuhiro Toratani, Hiroshi Kobayashi, Wataru Takahashi, Akihiko Tanaka, Byung-Ju Sohn

Proceedings Volume 4154, Hyperspectral Remote Sensing of the Ocean; (2001) https://doi.org/10.1117/12.411681
Event: Second International Asia-Pacific Symposium on Remote Sensing of the Atmosphere, Environment, and Space, 2000, Sendai, Japan

Abstract

The presentation focuses on the peculiarity of Asian waters with respect to the atmospheric correction of the satellite ocean color data such as of Ocean Color and Temperature Scanner (OCTS). We first demonstrate the effect of highly turbid case 2 waters on the atmospheric correction via non- zero water reflectance in the near infrared region. The results of applying the OCTS standard correction scheme to typical Chinese coastal OCTS scenes reveal that a significant portion of the area is masked due to the negative water reflectance retrieved by the scheme, even using 765 nm and 865 nm bands instead of 670 and 865 nm pair to determine aerosol contribution. An optical model that relates suspended solid (SS) and chlorophyll-a (Chl-a) concentrations to the near infrared water reflectances was implemented into the atmospheric correction, together with a neural network that estimates Chl-a and SS concentrations. The new iterative scheme is applied to the Chinese coastal scenes and the results are assessed to be favorable. The paper then discuss the modeling of Asian dust aerosol in hope of establishing aerosol models that can be used for atmospheric correction. A set of models are designed with varying controlling parameters such as size distribution, vertical profile, and imaginary part of the refractive index. A series of radiative transfer simulation is conducted and the spectrum of the top-of- atmosphere radiance is compared to that of a Sea Wide Filed- of-view Scanner (SeaWiFS) data obtained under Asian dust event. The results of the comparison suggest that the Asian dust aerosol has unique spectral absorption feature at the blue region (in 412 nm band, i.e.).

Citation Download Citation

Hajime Fukushima, Mitsuhiro Toratani, Hiroshi Kobayashi, Wataru Takahashi, Akihiko Tanaka, and Byung-Ju Sohn "Atmospheric correction algorithm for satellite ocean color data over Asian waters", Proc. SPIE 4154, Hyperspectral Remote Sensing of the Ocean, (5 January 2001); https://doi.org/10.1117/12.411681

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