Depolarization properties of cirrus clouds near the tropopause measured by a lidar at Chung-Li (25<degree>N, 121<degree>E)

Wei-Nai Chen; G.W. Jian; C.Z. Cao; Jee-Bai Nee

doi:10.1117/12.417093

13 February 2001 Depolarization properties of cirrus clouds near the tropopause measured by a lidar at Chung-Li (25 deg N, 121 deg E)

Wei-Nai Chen, G.W. Jian, C.Z. Cao, Jee-Bai Nee

Author Affiliations +

Proceedings Volume 4153, Lidar Remote Sensing for Industry and Environment Monitoring; (2001) https://doi.org/10.1117/12.417093
Event: Second International Asia-Pacific Symposium on Remote Sensing of the Atmosphere, Environment, and Space, 2000, Sendai, Japan

Abstract

The polarization lidar measurements were carried out to investigate the optical properties of ice crystals. The cloud height, extinction-to-backscattering ratio, optical depth, and depolarization ratio for cirrus clouds in the height range of 10-17 km were analyzed. We found the cloud optical depth has a clear height dependence, with high clouds optically thin. There is an increasing trend of depolarization ratio with height between 12-16 km. There is a clear relationship between the depolarization ratio and the optical depth. For cirrus clouds at heights between 13 and 16 km region, the clouds with optical depths smaller than 0.1 have depolarization ratios about 0.3. Large depolarization ratio (0.6) was found for subvisual clouds of optical depthabout 0.02. Thick clouds with optical depth larger than 0.1 have an average depolarization ratio about 0.2.

Citation Download Citation

Wei-Nai Chen, G.W. Jian, C.Z. Cao, and Jee-Bai Nee "Depolarization properties of cirrus clouds near the tropopause measured by a lidar at Chung-Li (25 deg N, 121 deg E)", Proc. SPIE 4153, Lidar Remote Sensing for Industry and Environment Monitoring, (13 February 2001); https://doi.org/10.1117/12.417093

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