Atmospheric correction scheme for GLI with absorptive aerosol correction |
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| Authors: | Mitsuhiro Toratani Hajime Fukushima Hiroshi Murakami Akihiko Tanaka |
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| Institution: | (1) School of High Technology for Human Welfare, Tokai University, Nishino, Numazu, Shizuoka 410-0395, Japan;(2) Earth Observation Research and Application Center, Japan Aerospace Exploration Agency (JAXA), Sengen, Tsukuba, Ibaraki 305-8505, Japan;(3) Nagasaki Industrial Promotion Foundation, Bunkyo, Nagasaki, Nagasaki 852-8521, Japan |
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| Abstract: | The present study proposes an atmospheric correction scheme for Advanced Earth Observation Satellite II (ADEOS-II)/Global
Imager (GLI) ocean color retrieval that corrects for the atmospheric absorptive aerosol effect. Radiative transfer simulations
were conducted assuming a non-absorptive model aerosol with a soot-type aerosol at various mixture ratios. The results indicate
that while the spectral dependency of aerosol reflectance does not change in the longer (>550 nm) wavelength region, the reflectance
at shorter wavelengths is highly variable and depends on the mixture ratio. The influence of aerosol absorption was also investigated
using GLI data from ocean areas adjacent to Japan in the presence of absorptive Siberian fire smoke aerosol in the spring
of 2003. The spectral curvature of the aerosol was estimated from the data obtained. An empirical, iterative scheme that detects
and evaluates the influence of absorptive aerosols was developed by comparing 380 nm GLI-observed aerosol reflectance with
predicted reflectances derived using an in-water optical model. To evaluate the performance of this scheme, satellite-derived
normalized water-leaving radiances were compared with those measured from a ferry servicing Nagasaki and Fukue. The results
of data acquired on March 20, 2003, indicate that this absorption correction scheme improved root mean square estimation error
for normalized water-leaving radiance by approximately 40% in the 380, 400, and 412 nm bands. This atmospheric correction
algorithm was used as a part of the second version of the GLI standard ocean color data process system at Japan Aerospace
Exploration Agency (JAXA). |
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| Keywords: | Ocean color remote sensing water-leaving radiance chlorophyll absorptive aerosol |
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