Validation of ADEOS-II/GLI ocean-color atmospheric correction based on ship-board hand-held spectroradiometer measurements

Hajime Fukushima; Mitsuhiro Toratani; Hiroshi Murakami; Pierre-Yves Deschamps; Robert J. Frouin; Akihiko Tanaka

doi:10.1117/12.621044

12 September 2005 Validation of ADEOS-II/GLI ocean-color atmospheric correction based on ship-board hand-held spectroradiometer measurements

Hajime Fukushima, Mitsuhiro Toratani, Hiroshi Murakami, Pierre-Yves Deschamps, Robert J. Frouin, Akihiko Tanaka

Author Affiliations +

Proceedings Volume 5885, Remote Sensing of the Coastal Oceanic Environment; 588505 (2005) https://doi.org/10.1117/12.621044
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

Abstract

The paper compares GLI-derived estimates obtained under "version 2" GLI standard atmospheric correction algorithm with in situ measured data collected by SIMBADA handheld above-water radiometer, intending the evaluating the performance of the algorithm which includes empirical absorptive aerosol correction as well as sun glint correction. Over 395 match-up data, average estimation error (difference between GLI-derived and SIMBADA-measured data) in normalized water-leaving radiance (nL_W) is 0.3 μW/cm²/nm/sr in 412 and in 443 nm bands, showing improvement from version 1 GLI atmospheric correction by 10-30 %, whereas estimation bias is reduced significantly. The GLI-derived aerosol optical thickness (AOT) in 865 nm band show 0.1 RMS error against SIMBADA measurement on average, whereas Angstrom exponent estimate shows significant bias, suggesting potential calibration offset among GLI near-infrared bands. Despite relatively large scattering in nL_W match-up analysis, comparison between GLI chlorophyll a concentration estimates and SIMBADA-derived estimation show highly correlated and consistent relation. This will suggest that fluctuations in nL_W estimate are systematic over GLI visible channels although the nature of the variability requires further investigation.

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Hajime Fukushima, Mitsuhiro Toratani, Hiroshi Murakami, Pierre-Yves Deschamps, Robert J. Frouin, and Akihiko Tanaka "Validation of ADEOS-II/GLI ocean-color atmospheric correction based on ship-board hand-held spectroradiometer measurements", Proc. SPIE 5885, Remote Sensing of the Coastal Oceanic Environment, 588505 (12 September 2005); https://doi.org/10.1117/12.621044

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KEYWORDS

Atmospheric corrections

Aerosols

Error analysis

Sun

Reflectivity

Satellites

Ocean optics

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