FY2C/D卫星反演云特性参数与地面雨滴谱降水观测初步分析  

Analysis of Cloud Characteristic Parameters Retrieved by FY2C/D Satellite and the Parsivel Observation on Surface

作　　者：蔡淼[1,2] 周毓荃[2] 朱彬[1] 

机构地区：[1]南京信息工程大学大气物理学院,南京210044 [2]中国气象科学研究院,北京100081

出　　处：《气象与环境科学》2010年第1期1-6,共6页Meteorological and Environmental Sciences

基　　金：国家"十一五"科技支撑课题(2006BAC12B07);中国气象局2009年新技术推广项目(CMATG2009MS09)资助

摘　　要：针对2008年4月11-12日一次北方层状云降水过程,将FY2C/D静止卫星反演的云参数和地面同时段的雨滴谱仪的观测资料进行联合分析,发现反演得到的一些特征云参数对地面降水有一定的指示意义:一般降水发生前,云系发展,云顶抬升,云顶温度和云黑体亮温都降低,云光学厚度增大,云参数先于地面降水变化,两者大概相差2小时。其中,云光学厚度与地面降水量和降水粒子数关系密切,其相关性比云顶高度、云顶温度和云黑体亮温的相关性都好;一般地面降水强,光学厚度一定大,若云层光学厚度较小,即便云顶发展得很高,地面几乎无降水或降水较小,但云光学厚度大时,地面降水强度并不一定都大,可能降水粒子数浓度大,地面多降毛毛雨。For the process of stratocumulus precipitation in north China from 11 to 12 April, 2008, the cloud parameters products retrieved by FY2C/D are combined with the Parsivel observation at the same period. We found that, the cloud characteristic parameters product retrieved indicated the precipitation on the surface. Generally speaking, before the rainfall, the cloud developed well, the top of cloud rose, both the temperature near the top of cloud and tbb reduced, and cloud optical thickness got larger. Cloud optical thickness changed about two hours earlier than precipitation. Cloud optical thickness was more related to surface precipitation and the number of precipitation particles. Compared to the top of cloud, the temperature near the top of cloud and tbb, cloud optical thickness had a better relationship with surface precipitation. Where surface precipitation is strong, cloud optical thickness must be large. Sur- face precipitation didn＇ t occur or occurred small if cloud optical thickness was very small, although cloud rose high enough. However, cloud optical thickness was large, surface precipitation is not always strong. The concentration of precipitation particles number may be big and drizzle often occurs.

关 键 词：云参数 光学厚度 地面降水 相关性 

分 类 号：P456.1[天文地球—大气科学及气象学] P412.27