年代际背景下南半球冬季500 hP EOF分析

Analysis of 500 hP EOF in Southern Hemisphere Winter under Interdecadal Background

利用NCEP/NCAR再分析资料,台风位置、强度、最大风速等相关资料(温州台风网),利用EOF分析、相关分析、小波分析等分析方法,分析了南半球冷空气活动通过向北越赤道气流对西北太平洋热带气旋的影响。本文在前人研究基础上,对不同年代际背景下的时空特征进行分析,研究发现,南极冷空气活动存在多模态的异常特征,南极极涡地区的冷空气活动与索马里、中国南海区域向北越赤道气流有明显的正相关关系。

Using NCEP/NCAR reanalysis data, including typhoon location, intensity, maximum wind speed, and other related data (Wenzhou Typhoon Network), and using methods such as EOF analysis, correlation analysis, and wavelet analysis, the impact of cold air activity in the southern hemisphere on tropical cyclones in the northwest Pacific through northward cross-equatorial airflow was analyzed. Research has found that in the interdecadal context, there are multimodal anom-alous features of cold air activity in Antarctica, and there is a clear positive correlation between cold air activity in the Antarctic polar vortex region and the northward equatorial airflow in Somalia and the South China Sea.