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30 December 2004 Simultaneous estimation of optical parameters of the Asian dust and ground reflectance from POLDER data
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Abstract
The optical parameters of the Asian dust over the desert in China and the surface reflectance were estimated simultaneously, using reflectances and polarizations at the wavelength 670 nm in several points selected from ADEOS/POLDER data taken on April 10, 1997. It was assumed that the land surface is the diffuse reflector and the number size distribution of the Asian dust is represented by the Junge power-law. The optical parameters of the dust layer, such as the optical thickness, refractive index of the dust aerosol and index of the Junge power-law, and the ground reflectance were determined such that the sum of the relative absolute error between the observed reflectance and polarization and those obtained from the simulation of radiative transfer in the atmosphere-ground system is minimum. As a result, it was found that the refractive index of Asian dust is 1.4 to 1.5, the optical thickness of dust layer is 0.1 to 0.2, the index of Junge power-law is -5.3 to -6.0 and the surface reflectance is 0.3 at the wavelength 670 nm.
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Takashi Kusaka and Tomoya Nishisaka "Simultaneous estimation of optical parameters of the Asian dust and ground reflectance from POLDER data", Proc. SPIE 5652, Passive Optical Remote Sensing of the Atmosphere and Clouds IV, (30 December 2004); https://doi.org/10.1117/12.578577
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