Dr. Kazuaki Kawamoto Profile

Dr. Kazuaki Kawamoto

at Nagasaki Univ

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Proceedings Article | 8 December 2006 Paper

Retrieval of optical properties of water cloud from VIS/IR and comparison with TMI/TRMM

Toshiro Inoue, Kazuaki Kawamoto

Proceedings Volume 6408, 64080F (2006) https://doi.org/10.1117/12.702603

KEYWORDS: Clouds, Water, Particles, Ocean optics, Optical properties, Liquids, Climatology, Atmospheric particles, Absorption, Channel projecting optics

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We studied a method to retrieve the optical thickness and effective particle radius of water clouds using the split-window channels and the 8.7-μm channel of Meteosat-8. Valid ranges are approximately from 1 to 9 for optical thickness and smaller than 18 micron for effective particle radius. The retrieval used the brightness temperature (TBB) and brightness temperature difference (BTD) between the split windows, as computed with the radiation code RSTAR5b for various properties of water clouds and vertical profiles of temperature and water vapor. The retrieved cloud parameters were then compared to those retrieved by the solar reflection method, which employs the 0.6-, 3.9-, and 11- μm channels of Meteosat-8. Comparison between the two methods revealed that the split-window technique could capture spatial features for both optical thickness and effective particle radius. The BTD is a good indicator for optical thickness. The diurnal variation of BTD shows the minimum value (thickest) before sunrise. Further precipitation and optical depth estimated from TMI/TRMM are compared with optical properties.

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