云雨条件下AMSR2微波成像资料同化试验及其在台风预报中的应用

Assimilation experiment of AMSR2 microwave imaging data under cloudy and rainy condition and its application on the forecast of a typhoon process

采用WRF-ARW和WRFDA的3.8版本进行云雨条件下AMSR2(Advanced Microwave Scanning Radiometer 2)卫星微波成像资料的同化试验,并选择2014年7月第9号台风"威马逊"为研究对象,检验同化云雨条件下的AMSR2资料对台风预报结果的影响。结果表明:(1)云雨条件下的质量控制方案所保留的像元明显多于晴空条件下质量控制方案,且亮温模拟结果更加接近观测;(2)云雨影响的加入使得风场、高度场和海平面气压场的模拟结果好于晴空条件下模拟,且对台风中心有增温、增湿的作用。(3)云雨条件下模拟对台风的路径和强度预报均有改善。

The WRF-ARW and WRFDA v3. 8 were used to assimilate AMSR2（ Advanced Microwave AMSR2 Scanning Radiometer 2） satellite microwave imaging data under cloudy and rainy condition,and to examine its influence on the forecast of a typhoon called ＂Wimason＂（ No. 9 in 2014）. Results show that：（1） The pixels reserved by the quality control scheme under cloudy and rainy condition are significantly more than these the quality control scheme under clear sky. The simulation results of brightness temperature is closer to observation.（2） After adding the influence of cloudy and rainy,the simulation results of wind field,height field and sea surface pressure are better than those in clear sky,on the other hand,the influence of cloudy and rainy also increases temperature and humidity of Typhoon center.（3） Both the path and intensity of typhoon forecast are improved by the simulation under cloudy and rainy condition.