三波长激光雷达拟合卷云的粒子形状

卷云在全球出现的概率可达30%，其散射特性在气候模式、光辐射传输和遥感领域都具有非常重要的意义。卷云的散射特性主要由冰晶粒子形状、尺度谱、折射率等因素所决定。利用355, 532和1 064 nm三个波长激光雷达数据反演卷云的后向散射系数颜色比，利用模拟计算获得不同形状冰晶粒子的卷云在上述三个波长上的后向散射系数颜色比，通过拟合得出被测卷云的冰晶粒子形状。拟合结果表明，合肥上空卷云中冰晶粒子大部分可能呈聚合物状。

The Estimation of Cirrus Cloud Particulate Shape Using Combined Simulation and a Three-Wavelength Lidar Measurement

The global occurrence of cirrus clouds can reach as high as 30%, whose scattering properties are essential impact on the climatic model, radiative transfer, and remote sensing. Their scattering properties are determined by the ice crystal shape, size distribution, refractive index and so on. Retrieval of the backscattering color ratios of cirrus cloud using a 355, 532 and 1 064 nm three-wavelength lidar, combined with the simulation of the three backscattering color ratios of different ice crystal shape, the shape of the lidar-measured ice crystal can be estimated. The results indicate that the shape of cirrus cloud over Hefei city is mostly composed by aggregates.