张戈,龙景超,严厉,薛宇峰,徐建军,刘春雷,张树钦

• 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
• 3:成都信息工程大学大气科学学院

摘要(Abstract)：

【目的】探讨太平洋年代际涛动(PDO)不同位相下其对BSISO时空特征、强度等产生的影响。【方法】利用NOAA云顶向外长波辐射和NCEP-DOE再分析资料研究PDO不同位相下夏季(5-10月)BSISO的活动特征和PDO影响BSISO的可能机制。【结果与结论】PDO影响BSISO的周期:暖位相下BSISO活动周期较冷位相下活动周期短,暖位相周期主要是10～50 d,而冷位相周期主要是10～40 d和60～70 d。冷暖位相周期均在10～40 d显著,而PDO暖冷位相分别在40～50 d、60～70 d相对显著。PDO影响BSISO的活动轨迹:PDO暖位相下对流活动在西太平洋上呈东南-西北向的移动趋势,而PDO冷位相时对流从印度洋向东北移动,对流中心可延伸至热带西太平洋,后转向西北移动直至南海上空。PDO影响BSISO的原因:PDO暖位相时,西太平洋有强的东风剪切异常,有利于对流的向北移动。而冷位相下,孟加拉湾至南海及以南区域东风垂直剪切异常、比湿正异常以及比湿的经向梯度共同作用驱动对流向北移动。此外,PDO暖位相较冷位相位势高度偏高,因而对BSISO活动强度起到抑制作用。

关键词(KeyWords)： 太平洋年代际涛动;北半球夏季季节内振荡;南海;时空特征

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划项目（2018YFC1505902）;; 国家自然科学基金青年项目（41905006）;; 广东海洋大学科研启动经费资助项目（R19018）

作者(Author): 张戈,龙景超,严厉,薛宇峰,徐建军,刘春雷,张树钦

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