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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

     

摘要

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 micrometers.(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.%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4.5μm;(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.

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