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Proceedings Paper

Radiation signature of clouds
Author(s): Guibin Yuan; Zhigang Fan; Xiaogang Sun
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Paper Abstract

Modified gamma distribution was used to describe the distribution of particles in clouds. The polydisperse particle system may be converted into a monodisperse particle system. 1) The averaged radius of nonspherical particles associated with a given size distribution, 2) the averaged scattering parameters of water droplets in cumulus, stratus and stratocumulus and that of ice crystals in cirrus, and 3) infrared emissivity of a cirrus layer from the mixing ratios and effective sizes of cloud drop and ice crystal were separately calculated. Simulation results indicate that all scattering parameters of water droplets in cumulus, stratus and stratocumulus are similar. Cross sections increase with the increasing equivalent radius. While efficiency factors vibrate with the increase of equivalent radius. The averaged albedo reaches its peak between 2 and 3 micron, and then decrease with the increasing equivalent radius. The averaged asymmetry factor also vibrates with the increase of equivalent radius. But the scattering parameters of ice crystals in cirrus change differently, and they vary linearly with equivalent radius.

Paper Details

Date Published: 28 December 2010
PDF: 11 pages
Proc. SPIE 7544, Sixth International Symposium on Precision Engineering Measurements and Instrumentation, 754474 (28 December 2010); doi: 10.1117/12.885308
Show Author Affiliations
Guibin Yuan, Harbin Institute of Technology (China)
Zhigang Fan, Harbin Institute of Technology (China)
Xiaogang Sun, Harbin Institute of Technology (China)


Published in SPIE Proceedings Vol. 7544:
Sixth International Symposium on Precision Engineering Measurements and Instrumentation
Jiubin Tan; Xianfang Wen, Editor(s)

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