The depolarization - attenuated backscatter relation: CALIPSO lidar measurements vs. theory.
OPTICS EXPRESS(2007)
摘要
Using measurements obtained by the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) satellite, relationships between layer-integrated depolarization ratio (delta) and layer-integrated attenuated backscatter (gamma') are established for moderately thick clouds of both ice and water. A new and simple form of the delta-gamma' relation for spherical particles, developed from Monte Carlo simulations and suitable for both water clouds and spherical aerosol particles, is found to agree well with the observations. A high-backscatter, low-depolarization delta-gamma' relationship observed for some ice clouds is shown to result primarily from horizontally oriented plates and implies a preferential lidar ratio - depolarization ratio relation in nature for ice cloud particles containing plates. (C) 2007 Optical Society of America.
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关键词
monte carlo simulation,lidar
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