在MM5伴随模式中使用AMSU资料对暴雨的数值模拟

A Simulation of Heavy Rain Using AMSU Data in MM5 Adjoint Model

摘要:

在MM5伴随模式中使用NOAA-16极轨卫星探测获得的AMSU资料,并与MM5数值模式仅使用常规资料的条件下,对发生在2003年7月4—5日江淮流域的一次暴雨过程进行了数值模拟对比研究。结果表明:使用AMSU资料后,湿度场、温度场和风场均得到一定程度的改善,降水的落区和强度也更接近实况。

Abstract:

In this paper,the AMSU(Advanced Microwave Sounding Unit) data from NOAA-16 satellite are used in the simulation of the heavy rainfall event in the Changjiang-Huaihe River Valley during July 4—5 2003.When the atmospheric temperature,wind and humidity retrieved from the AMSU are added into the MM5 Adjoint Model,the initial fields are improved,especially in temperature and humidity.Compared with the simulation results from the MM5 model using only conventional observations,it is found that retrievals have ability to reveal clearly the structure of temperature and humidity fields,thus obviously improving the intensity and location of model precipitation,so that the accuracy of MM5 Adjoint Model’s rainfall prediction and its Ts grades are greatly improved.