同化FY-3C/MWHTS观测资料反演的海面气压场对台风数值预报的影响  

Influence of Assimilating the Sea Surface Pressure Fields Retrieved from FY-3C/MWHTS Data on Typhoon Forecasting

作　　者：张子瑾 董晓龙 Zhang Zijin;Dong Xiaolong(Key Laboratory of Microwave Remote Sensing,Chinese Academy of Sciences,Beijing 100190,China;National Space Science Center,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China;International Space Science Institute-Beijing,Beijing 100190,China)

机构地区：[1]中国科学院国家空间科学中心微波遥感技术重点实验室,北京100190 [2]中国科学院国家空间科学中心,北京100190 [3]中国科学院大学,北京100049 [4]国际空间科学研究所(北京),北京100190

出　　处：《遥感技术与应用》2020年第4期901-910,共10页Remote Sensing Technology and Application

基　　金：国家重点研发计划项目“地球科学观测与导航专项”(2017YFB0502800和2017YFB0502802)。

摘　　要：由中国风云三号C星(FY-3C)搭载的微波温湿探测仪(MWHTS)的亮温观测资料能够实时反演得到高分辨率、高精度的海面气压场。基于三维变分同化方法将FY-3C/MWHTS观测资料反演的海面气压场同化进入中尺度天气研究与预报(Weather Research and Forecasting,WRF)模式,以台风“Maria”和“Noru”为例,通过控制实验和同化试验的对比分析,探讨了同化反演的海面气压场对台风数值预报的影响。初始化敏感性试验结果表明,同化海面气压场使初始时刻台风中心气压与位置更接近实况,并且调整了台风初始温度场和风场的结构和分布。台风的数值预报结果表明:同化反演的海面气压场能够改进台风的路径和强度预报精度。Using measurements with the Microwave Temperature and Humidity Sounder(MWHTS)onboard the Chinese Fengyun-3C satellite,real-time and high resolution sea surface pressure information can be retrived.Based on the three-dimensional variational assimilation(3DVAR)method,the retrieved sea pressure fields from FY-3C/MWHTS observations are assimilated into the Weather Research and Forecasting(WRF)model.The influence of the retrieved pressure fields on typhoon forecasting is discussed through the comparison between control experiment and assimilation experiment.Sensitivity experiments of typhoon Maria and Noru show that the assimilation of sea surface pressure fields makes the central pressure and central location closer to the actual value,and adjusts the structure and distribution of initial temperature fields and wind fields.The numerical prediction results show that the assimilation of the sea surface pressure fields can improve the accuracy of typhoon track and intensity prediction.

关 键 词：海面气压 FY-3C/MWHTS资料 三维变分同化 台风 

分 类 号：P407[天文地球—大气科学及气象学]