AMSR2辐射率资料同化对台风“山神”分析和预报的影响研究

The Impact of AMSR2 Radiance Data Assimilation on the Analysis and Forecast of Typhoon Son-Tinh

在WRFDA-3DVar(Weather Research and Forecasting model’s 3-dimensional variational data assimilation)的框架下,添加了新的探测器AMSR2(Advanced Microwave Scanning Radiometer 2)微波辐射率资料的同化模块,实现了AMSR2辐射率资料在中小尺度同化系统中的有效使用。台风"山神"(Son-Tinh)直接同化AMSR2资料的个例试验结果表明,AMSR2资料可以很好的探测出台风的形态,并且与没有同化该资料的控制试验相比,同化AMSR2辐射率资料可以有效提高模式分析场的质量,进一步提高了台风中心气压,最大风速和台风路径的预报。

A new assimilation module of AMSR2（Advanced Microwave Scanning Radiometer 2） radiance data was constructed in WRFDA-3DVAR（Weather Research and Forecasting model＇s 3-dimensional variational data assimilation）.With this module,the impact of AMSR2 assimilation on the analysis and forecast of Typhoon Son-Tinh was evaluated.AMSR2 data is able to detect Son-Tinh＇s cloud band pattern.Compared to the experiment without AMSR2 assimilation,AMSR2 assimilation provided a better typhoon structure,and significantly improved the central sea level pressure,maximum wind speed and typhoon track forecasts.