大气-海洋-海浪耦合同化模式在台风过程模拟中的应用

基于MCT耦合器,利用中尺度大气模型WRF、海洋模型FVCOM和第三代海浪模型SWAN,实现大气、海洋和海浪的三者实时耦合计算,同时采用卫星微波辐射资料AMSU-A,通过WRF大气模式的资料同化模块WRFDA,实现对风场模拟的连续同化,从而建立起大气-海洋-海浪耦合与卫星数据同化的W-F-S-A耦合同化模式。将该模型应用于2014年台风“威马逊”的数值模拟,并与其他模型进行比较。结果表明,W-F-S-A耦合同化模式对于台风路径和风速的模拟结果优于单独耦合和单独同化结果,并且可以较好地模拟上层海洋对台风的响应特征。

Application of a coupled atmosphere-ocean-wave model in typhoon process simulation

On the basis of Model Coupling Toolkit (MCT), real-time coupling among atmosphere, ocean and wave simulation are carried out by utilizing the mesoscale atmosphere model WRF, the ocean model FVCOM and the third-generation wave model SWAN. At the same time, continuous assimilation of wind field is applied by assimilation module WRFDA of WRF using satellite microwave radiation data AMSU-A and then the combined model W-F-S-A of coupling and assimilation is established. The combined W-F-S-A model is used to simulate the processes of Typhoon "Rammasun" in 2014. The simulated results indicate that the typhoon track and surface wind velocity from W-F-S-A model are closer to in-situ measurements than that from single coupling model or single assimilation model. The W-F-S-A model also performs better in simulating the response characteristics of the upper ocean during the typhoon process.