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Measuring cloud droplet effective radius and liquid water content using changes in degree of linear polarization along cloud depth

机译:使用沿着云层深度的线性极化程度的变化来测量云滴的有效半径和液态水含量

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摘要

Two important parameters of liquid clouds are the cloud effective size (CES) and liquid water content (LWC). To measure these parameters, we have used two multiple scattering depolarization effects: (1) the slope of the degree of linear polarization (SLDLP) at the cloud base, and (2) the saturated degree of linear polarization (SADLP) at infinite altitude. We used Monte Carlo simulation to validate this method, with the assumption that the water cloud droplet size follows a Gamma distribution. From our calculation, we find that although the SADLP varies with both extinction coefficient (or LWC) and the CES, the SLDLP varies only with the extinction coefficient. After extracting the extinction coefficient using the SLDLP, we can easily obtain the CES using the SADLP. As a result, we found that the CES and the LWC can be extracted from the experimental parameters of SLDLP and SADLP, which can be easily measured using a single wavelength depolarization LIDAR.
机译:液态云的两个重要参数是云有效大小(CES)和液态水含量(LWC)。为了测量这些参数,我们使用了两种多重散射去极化作用:(1)云底的线性极化度(SLDLP)的斜率,以及(2)在无限高度处的线性极化饱和度(SADLP)。我们使用蒙特卡洛模拟来验证此方法,并假设水云滴大小遵循Gamma分布。从我们的计算中,我们发现尽管SADLP随消光系数(或LWC)和CES而变化,但SLDLP仅随消光系数而变化。使用SLDLP提取消光系数后,我们可以轻松地使用SADLP获得CES。结果,我们发现可以从SLDLP和SADLP的实验参数中提取CES和LWC,这可以使用单波长去极化LIDAR轻松测量。

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