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首页> 外文期刊>IEEE Geoscience and Remote Sensing Letters >Statistical Properties of Horizontally Oriented Plates in Optically Thick Clouds From Satellite Observations
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Statistical Properties of Horizontally Oriented Plates in Optically Thick Clouds From Satellite Observations

机译：从卫星观测看光学厚云中水平取向板块的统计性质

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摘要

Specular reflection from horizontally oriented plates (HOPs) has significant effects on lidar backscatter. The intensity of specular reflection from HOPs is high in warm mixed-phase clouds and low in cold ice clouds. The theoretical simulations of lidar backscatter and depolarization ratio are consistent with spaceborne measurements for optically thick mixed-phase and ice clouds if an equivalent percentage of HOPs of 0.08%–0.3% is assumed. Based on the joint probability density function of the attenuated backscatter and depolarization ratio observed by the Cloud–Aerosol Lidar with Orthogonal Polarization aboard the Cloud–Aerosol Lidar and Infrared Pathfinder Satellite Observations platform, it is estimated that HOPs exist in approximately 60% of optically thick $(tau > 3)$ ice and mixed-phase cloud layers. The cloud-layer temperature is the primary factor affecting the distribution of HOPs. Specifically, HOPs exist in approximately 88% of optically thick ice and mixed-phase cloud layers warmer than $-30 ^{circ} hbox{C}$, in approximately 84% of ice and mixed-phase cloud layers between $-30 ^{circ}hbox{C}$ and $-45 ^{circ}hbox{C}$, and in approximately 29% of cold ice cloud layers below $-45 ^{circ}hbox{C}$.
机译：来自水平方向板（HOP）的镜面反射对激光雷达的反向散射有重要影响。 HOP的镜面反射强度在温暖的混合相云中较高，而在冷冰云中较低。如果假设HOP的当量百分比为0.08％-0.3％，则激光雷达后向散射和去极化率的理论模拟与太空测量的光学厚混合相和冰云一致。根据云-气溶胶激光雷达和红外探路者卫星观测平台上正交偏振的云-气溶胶激光雷达观测到的衰减后向散射和去极化率的联合概率密度函数，估计HOPs约占光学厚度的60％ $（tau> 3）$ 冰层和混合相云层。云层温度是影响HOP分布的主要因素。具体来说，HOP存在于约88％的光学厚冰和混合相云层中，其温度比 $-30 ^ {circ} hbox {C} $ ，在 $-30 ^ {circ} hbox {C} $ 和 $ -45 ^ {circ} hbox {C} $ ，约占29％ $-45 ^ {circ} hbox {C} $ 下方的冷冰云层。

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