Ding Jiachen, Yang Ping, Holz Robert E, Platnick Steven, Meyer Kerry G, Vaughan Mark A, Hu Yongxiang, King Michael D
Opt Express. 2016 Jan 11;24(1):620-36. doi: 10.1364/OE.24.000620.
An invariant imbedding T-matrix (II-TM) method is used to calculate the single-scattering properties of 8-column aggregate ice crystals. The II-TM based backscatter values are compared with those calculated by the improved geometric-optics method (IGOM) to refine the backscattering properties of the ice cloud radiative model used in the MODIS Collection 6 cloud optical property product. The integrated attenuated backscatter-to-cloud optical depth (IAB-ICOD) relation is derived from simulations using a CALIPSO (Cloud-Aerosol Lidar and Infrared Pathfinder Satellite) lidar simulator based on a Monte Carlo radiative transfer model. By comparing the simulation results and co-located CALIPSO and MODIS (Moderate Resolution Imaging Spectroradiometer) observations, the non-uniform zonal distribution of ice clouds over ocean is characterized in terms of a mixture of smooth and rough ice particles. The percentage of the smooth particles is approximately 6% and 9% for tropical and midlatitude ice clouds, respectively.
采用不变嵌入T矩阵（II-TM）方法计算8列聚集体冰晶的单次散射特性。将基于II-TM的后向散射值与通过改进的几何光学方法（IGOM）计算的值进行比较，以完善MODIS Collection 6云光学特性产品中使用的冰云辐射模型的后向散射特性。基于蒙特卡罗辐射传输模型，利用云-气溶胶激光雷达和红外探路者卫星观测（CALIPSO）激光雷达模拟器的模拟结果推导出积分衰减后向散射与云光学厚度（IAB-ICOD）的关系。通过比较模拟结果以及同步的CALIPSO和中分辨率成像光谱仪（MODIS）观测数据，从光滑和粗糙冰粒子混合的角度描述了海洋上空冰云的非均匀纬向分布。热带和中纬度冰云中光滑粒子的百分比分别约为6%和9%。
