NPP_ATMS亮温资料同化在台风数值模拟中的应用

A Numerical Study on Typhoon Based on NPP_ATMS Brightness Temperature Data Assimilation

选取2016年台风"海马"和"鲇鱼"临近登陆过程作为试验个例,在WRF模式基础上,采用控制试验与同化NPP_ATMS亮温资料对台风进行72h数值模拟,在台风路径、中心最低气压和中心最大风速三个方面对比实况分析了其模拟效果,试验结果表明:WRF模式对台风"海马"和"鲇鱼"的路径模拟效果非常好,尤其是前48h,但两个台风模拟输出的时间点都明显偏快,在强度模拟上也有参考价值。同化NPP_ATMS亮温资料后在路径上,除了个别点作用不明显外,大部分时间点都有一定的正作用。在中心气压和中心风速上影响较小,但有影响的时间点也均为正作用。

This article indicates the numerical model WRF simulates the typhoon named“haima”and“nianyu”happened in2016for example.Two kinds of initialization schemes and72-hour simulation are performed and NPP_ATMS brightness temperature data is ingested into the WRF model.The simulation results are analyzed in contrast to the observation path of typhoon,the lowest central air pressure and the highest central wind speed.Results suggest effects that WRF model simulates the paths of typhoon named“haima”and“nianyu”are very well,especially in the first48hours.Though output time points in simulation of the two typhoons move obviously faster,it is with reference value to intension simulation as well.Despite of few time points with unobvious effects,majority number of points are positive effects.Influence on central air pressure and wind speed are small but the time points with influence areinfluenced positively.