FY-2E卫星反演云特性参数产品在乌鲁木齐暴雪天气分析中的应用

Microphysical Characteristic Parameters Product Retrieved by FY-2E Satellite and Its Application in the Urumqi Snowstorm Weather Analysis

利用FY-2E静止卫星反演的云参数产品对乌鲁木齐2015年12月11日和2017年12月27日两次暴雪天气过程进行分析,发现在降水发生前2 h,云宏观参数的云顶温度、黑体亮温、云顶高度和过冷层厚度都处于不断增强的较高水平,且出现快速增强后又不断减弱,对应后期可能要出现强降水,其中与小时降水量变化具有较好的相关性,降水前期相关参量较降水中后期都要大。在降雪天气中云顶温度普遍在-20^-60℃,云顶高度最大值均超过10 km,过冷层厚度集中在2~9 km。从云微观参量来看,降雪云的光学厚度主要在10~35,绝大多数的有效粒子半径分布在15~35μm,两场天气的液水路径分别分布在75.49~975.63 g/m2和47.41~796.01 g/m2,前者降雪天气的云宏微观参量均值都不同程度地大于后者。

The cloud parameter products inversed by FY-2 E geostationary satellite were used to analyze the two snowstorm weather events on December 11 st,2015 and December 27 th,2017 in Urumqi.Two hours before the precipitation occurred,it was found that the cloud top temperature,blackbody brightness temperature,cloud top height and supercooled layer thickness of cloud macroscopic parameters were in the higher level of increasing.The macroscopic parameters of the cloud increased rapidly and then weaken continuously,and the corresponding precipitation may occur in the later stage.There was a good correlation between cloud macroscopic parameters and hourly precipitation,and the macroscopic parameters of the cloud in the early stage of precipitation were larger than those in the middle and later stage.In snowfall weather,the temperature of the cloud top was generally between-20℃and-60℃,the maximum height of the cloud top was more than 10 km,and the thickness of the supercooled layer was concentrated between 2 and 9 km.From the microscopic parameters of the cloud,the optical thickness of the snowfall cloud mainly was in the range of 10 to 35,and most of the effective particle radius was distributed between 15 and 35μm.The liquid-water paths of the two weather events were distributed at 75.49-975.63 g/m2 and 47.41-796.01 g/m2 respectively.The mean values of the cloud macroscopic and microcosmic parameters in the former were higher than those in the latter.