Radiation signature of clouds

Guibin Yuan; Zhigang Fan; Xiaogang Sun

doi:10.1117/12.885308

28 December 2010 Radiation signature of clouds

Guibin Yuan, Zhigang Fan, Xiaogang Sun

Proceedings Volume 7544, Sixth International Symposium on Precision Engineering Measurements and Instrumentation; 754474 (2010) https://doi.org/10.1117/12.885308
Event: Sixth International Symposium on Precision Engineering Measurements and Instrumentation, 2010, Hangzhou, China

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.

Citation Download Citation

Guibin Yuan, Zhigang Fan, and Xiaogang Sun "Radiation signature of clouds", Proc. SPIE 7544, Sixth International Symposium on Precision Engineering Measurements and Instrumentation, 754474 (28 December 2010); https://doi.org/10.1117/12.885308

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