摘要:为了探讨北京首都国际机场冻雨过程产生的可能机制，利用NCEP再分析资料、风云2号E星（FY-2E）的云顶亮温（Black Body Temperature，TBB）逐小时资料及风云3号A星（FY-3A）反演的云顶高度日平均资料做为检验依据，使用美国非静力中尺度模式（Weather Research and Forecasting，WRF）对2013年1月31日发生在首都机场附近地区的一次冻雨过程进行模拟，得出以下结论：1）模拟结果中的云顶温度与FY-2E的TBB逐小时资料对应较好：此次冻雨过程，整个降水云系云顶温度在0~-6℃之间，模拟结果水成物的垂直分布也得到了较好的印证；通过FY-3A反演的云顶高度日平均资料的检验，证明此次冻雨过程的云高基本维持在3 km左右，而且云微物理固态项的含量少。2）云顶温度、云顶高度实况与模式模拟表明此次过程是一次典型的暖雨机制冻雨，这说明产生北方冻雨的可能机制并不单一，冰相机制与暖雨机制可以同时存在。
关键词:冻雨/
暖雨机制/
WRF模式/
FY-2E数据
Abstract:In order to investigate the possible mechanism of freezing rain process, the WRF model (Weather Research and Forecasting) was used to simulate a freezing-rain process occurred on 31 Jan 2013 in the area of the Beijing Capital International Airport. The NECP reanalysis data, the Black Body Temperature (TBB) of FY-2E, the daily average cloud height data of FY-3A are used to verify the model simulation. Major conclusions are as follows:1) The cloud top temperature of the simulation is consistent with TBB of FY-2E. During the freezing rain process, the cloud top temperature varied between 0--6℃, and the simulated vertical distribution of the hydrometeors agree well with observations. According to the cloud top height derived from FY-3A observations, it is found that the cloud top in the freezing-rain process basically remained at around 3 km, and the clouds contained less microphysical solid contents. 2) Observed cloud top temperature and height and the simulation results show that this is a typical warm freezing rain process. This result indicates that the mechanism for the formation of freezing rain in northern China may not be single. Ice-crystal processes and warm-rain processes may simultaneously exist during the formation of freezing rain.
Key words:Freezing-rain/
warm-rain mechanism/
WRF model/
FY-2E data
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