2015年10月29日弱降雨前后的层状云微物理参数反演和分析

利用Ka波段毫米波云雷达和微波辐射计资料对2015年10月29日安徽寿县的一次弱降雨过程的云参数进行了反演，所采用的反演方案是单参数法和双参数法。论文先介绍了单参数和双参数反演方法，然后反演了降雨前后的云微物理参数，对比分析表明：（1）降水发生前云滴数浓度较大，典型值1 000个·cm^-3左右，有效半径小于4.5 μm；（2）降雨后，云滴数浓度显著减小，典型值在500个·cm^-3左右，但有效半径略增大了1~1.5 μm；（3）云中含水量的变化不明显，降雨后略增大，增加量在0.1 g·m^-3以内； （4）降水发生前，云微物理参数随高度的起伏较大，降水后的廓线比较平缓，显示出降雨后的云层动力特性更稳定。

Microphysical parameters retrieval and analysis on stratus cloud before and after light rainfall on October 29,2015

In order to study the cloud microphysical properties, the data of Ka-band millimeter radar and microwave radiometer were used to retrieve the stratus cloud microphysical variables of a light rainfall process over Shouxian, Anhui province on Oct.29 2015. Both single-factor and double-factor methods were used for retrieval. The methodology was firstly introduced, and then the cloud microphysical variables were retrieved and comparatively analyzed. The result shows as that:(1) the stratus cloud droplet concentration was about 1000 cm^-3 before rainfall, and the effective radius was smaller than 4.5 micro-meters.(2)The stratus cloud droplet concentration turned to be significantly less, about 500 cm^-3 after rainfall, but the effective radius was slightly increased by 1 to 1.5 micro-meters.(3)Cloud liquid water content weakly increased after rainfall, no more than 0.1 g/m³. (4)Before rainfall, the cloud microphysical variables fluctuated significantly with height, but the tendency became smoothly after rainfall, which implied that the cloud was getting more stable dynamically.