Analysis of lidar backscattering enhancement for pristine hexagonal ice crystals

Suginori Iwasaki; Hajime Okamoto

doi:10.1117/12.417094

13 February 2001 Analysis of lidar backscattering enhancement for pristine hexagonal ice crystals

Suginori Iwasaki, Hajime Okamoto

Proceedings Volume 4153, Lidar Remote Sensing for Industry and Environment Monitoring; (2001) https://doi.org/10.1117/12.417094
Event: Second International Asia-Pacific Symposium on Remote Sensing of the Atmosphere, Environment, and Space, 2000, Sendai, Japan

Abstract

We analyze lidar backscattering enhancement for pristine hexagonal ice crystals by using Fraunhofer diffraction based on Kirchhoff's diffraction theory (KD). Our numerical computations show that received power Pr(Z) at the altitude Z in lidar equation is proportional to Z-?, where ? is a function of Z, size and shape of particles. Pr(Z) is proportional to Z-1.5 for hexagonal plate and column randomly oriented in horizontal plane at Z=200 m where its aspect ratios are 1/3 and 3 and mode radiuses are 100,um. Our calculations suggest hexagonal ice crystals that have mode radiuses of 100 ?m and 30 ?m with perfectly oriented in horizontal plane have anomalous backscattering enhancement compared with a sphere at even high altitude. This might explain the phenomena reported by Platt et. al. (1978).1,2

Citation Download Citation

Suginori Iwasaki and Hajime Okamoto "Analysis of lidar backscattering enhancement for pristine hexagonal ice crystals", Proc. SPIE 4153, Lidar Remote Sensing for Industry and Environment Monitoring, (13 February 2001); https://doi.org/10.1117/12.417094

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