Hu Yongxiang, Liu Zhaoyan, Winker David, Vaughan Mark, Noel Vincent, Bissonnette Luc, Roy Gilles, McGill Matthew
Climate Science Branch, NASA Langley Research Center, Hampton, Virginia 23681, USA.
Opt Lett. 2006 Jun 15;31(12):1809-11. doi: 10.1364/ol.31.001809.
An empirical relationship is derived between the multiple-scattering fraction and the linear depolarization ratio by using Monte Carlo simulations of water clouds measured by backscatter lidar. This relationship is shown to hold for clouds having a wide range of extinction coefficients, mean droplet sizes, and droplet size distribution widths. The relationship is also shown to persist for various instrument fields of view and for measurements made within broken cloud fields. The results obtained from the Monte Carlo simulations are verified by using multiple-field-of-view lidar measurements. For space-based lidars equipped to measure linear depolarization ratios, this new relationship can be used to accurately assess signal perturbations due to multiple scattering within nonprecipitating water clouds.
通过对后向散射激光雷达测量的水云进行蒙特卡罗模拟，得出了多次散射分数与线性偏振比之间的经验关系。结果表明，这种关系适用于具有广泛消光系数、平均液滴大小和液滴大小分布宽度的云。该关系还表明，对于各种仪器视场以及在破碎云场中进行的测量都成立。通过使用多视场激光雷达测量，验证了从蒙特卡罗模拟中获得的结果。对于配备用于测量线性偏振比的天基激光雷达，这种新关系可用于准确评估非降水水云内多次散射引起的信号扰动。
