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