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

Toshiro Inoue; Kazuaki Kawamoto

doi:10.1117/12.702603

8 December 2006 Retrieval of optical properties of water cloud from VIS/IR and comparison with TMI/TRMM

Toshiro Inoue, Kazuaki Kawamoto

Proceedings Volume 6408, Remote Sensing of the Atmosphere and Clouds; 64080F (2006) https://doi.org/10.1117/12.702603
Event: SPIE Asia-Pacific Remote Sensing, 2006, Goa, India

Abstract

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.

Citation Download Citation

Toshiro Inoue and Kazuaki Kawamoto "Retrieval of optical properties of water cloud from VIS/IR and comparison with TMI/TRMM", Proc. SPIE 6408, Remote Sensing of the Atmosphere and Clouds, 64080F (8 December 2006); https://doi.org/10.1117/12.702603

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