谱松弛同化技术对台风季节活动数值模拟的影响-海洋预报

谱松弛同化技术对台风季节活动数值模拟的影响

单位：国家海洋环境预报中心自然资源部海洋灾害预报技术研究重点试验室, 北京 100081

分类号：P444

出版年·卷·期（页码）：2020·37·第三期（18-28）

摘要：

采用COAWST模式针对2015年5月1日-11月1日的台风季节活动设计了两组对比试验，探讨谱松弛同化技术对台风季节活动数值模拟的影响。通过比较两种试验结果中的台风季节信息发现：谱松弛能够显著提高对台风频数、强度、气旋累积能量分布以及路径密度分布的模拟。这种改善与模式中大尺度场如环流场、位势高度场、海温的改善息息相关。由于谱松弛的作用，模式能够基本再现边界场中的大尺度信息，避免台风活动导致大尺度场发生严重漂移，同时模式自身中小尺度过程能够自由发展，这使得模拟的台风季节活动更加符合观测。

Spectral nudging is one of the assimilation schemes, which plays an important role in improving the simulation of large-scale fields in s regional model. In this paper, COAWST model is used to design two sets of comparative experiments for typhoon seasonal activity from May 1 to November 1, 2015, and the influence of spectral nudging assimilation technology on simulation of typhoon seasonal activity is investigated. By comparing the typhoon seasonal information in the two experiments, it is found that spectral nudging can significantly improve the simulation of typhoon frequency, intensity, accumulated cyclone energy distribution and track density distribution. The improvement is closely related to the improvement of the large-scale fields in the model, such as the circulation field, the potential height field and the sea surface temperature. Due to the effect of spectral nudging, model can largely reproduce the large-scale information in the boundary field and avoid serious drift of the large-scale field caused by typhoon activity. Meanwhile, the small-scale process of the model itself can freely develop, which makes the simulated typhoon seasonal activity agree well with the observation.

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