台风“海鸥”期间南海北部波浪和SST变化特征分析

Surface Waves and SST Analysis in the Northern of South China Sea during Typhoon " Kalmaegi"

采用SWAN波浪模式对201415号台风‘海鸥’期间的海浪进行数值模拟,通过与实测数据对比,模拟结果较好。台风风场由圆形对称Jelesnianski-II模型构造,风场结构能够很好的体现出台风过境期间的变化情况。根据台风期间的实测温度数据以及ECMWF海表面温度数据的变化研究海表面温度对台风的响应。研究发现,台风"海鸥"在近海复杂的海洋和地形条件下,台风路径降温范围成不对称分布,最大降温中心出现在路径右侧,降温幅度将近1.5℃。

Wave model SWAN was used to simulate waves during Typhoon Kalmaegi. By comparison with the observation data, the model results are reasonable. The wind is constructed by Jelesnianski-II model, which reflects the structure and strength of typhoon clearly. The response of the sea surface temperature to the typhoon is analyzed based on the temperature of observation and the ECMWF data- set. The results show that the cooling range on the typhoon path is asymmetrically distributed, and that the maximum cooling center with the cooling rate nearly 1.5 ℃ appears on the right of the path, under the conditions of the complex topography of the ocean.