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  

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

作　　者：黄佳欢[1] 黄兴友[1] 黄勇 韦凯华 马雷[1] 

机构地区：[1]南京信息工程大学气象灾害预报预警与评估协同创新中心,南京210044 [2]安徽省寿县国家气候观象台,安徽寿县232200 [3]广东省气象台,广州510080

出　　处：《气象科学》2017年第4期478-486,共9页Journal of the Meteorological Sciences

基　　金：国家自然科学基金资助项目(41475034);国家重点基础研究发展计划(973计划)项目(2013CB430101);江苏省高等学校大学生实践创新训练计划项目(201410300052)

摘　　要：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1~1.5μm;(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。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 varia- bles 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 O. 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.

关 键 词：毫米波雷达和微波辐射计 云微物理参数 反演 对比分析 

分 类 号：P412.25[天文地球—大气科学及气象学]