李雅洁 ,李德琳 ,徐峰 ,柴博语 ,韩利国 ,陈思奇 ,杨金艺 ,张韶晶

• 1:广东海洋大学海洋与气象学院
• 2:广东海洋大学南海海洋气象研究院

摘要(Abstract)：

【目的】探讨索马里急流和南亚高压对印度夏季风(Indian Summer Monsoon,ISM)爆发产生的协同作用。【方法】基于ECMWF欧洲中期天气预报中心第五代再分析资料(ERA5)提供的逐日数据,结合印度气象局对ISM爆发日期(即印度次大陆最南端的喀拉拉邦降水骤升的日期)的统计数据采用功率谱分析、偏相关分析和滑动相关等统计学方法,分析索马里急流和南亚高压对ISM爆发的协同作用。【结果】ISM爆发前1候至当候,印度地区对流层高层南亚高压的范围和强度不断扩大,同时对流层低层索马里急流的强度和范围不断增强,使阿拉伯海地区的西南气流不断增强,将阿拉伯海地区大量水汽输送至印度大陆,在这样有利的条件下,印度南部降水量剧增,ISM爆发;当5月下旬的南亚高压、索马里急流以及阿拉伯海地区水汽通量和气旋性环流均显著偏强时,ISM会提前爆发,降水也会异常偏多。【结论】ISM爆发日期受到索马里急流和南亚高压两者协同作用的影响,而并非单独受到某个系统的影响。

关键词(KeyWords)： 印度夏季风;索马里急流;南亚高压;协同作用

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划（2018YFA0605604）;; 广东省重点领域研发计划（2020B0101130021）;; 广东省基础与应用基础研究基金项目（2019A1515111009）;; 广东海洋大学科研启动经费资助项目（060302032102）

作者(Author): 李雅洁 ,李德琳 ,徐峰 ,柴博语 ,韩利国 ,陈思奇 ,杨金艺 ,张韶晶

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