Vertical Structure and Energetics of the Western Pacific Teleconnection Pattern
Vertical Structure and Energetics of the Western Pacific Teleconnection Pattern
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DOI：
10.1175/jcli-d-15-0549.1
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发表时间：
2016-08
影响因子：
4.9
通讯作者：
Sho Tanaka;K. Nishii;H. Nakamura
中科院分区：
文献类型：
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作者：
Sho Tanaka;K. Nishii;H. Nakamura
西太平洋（WP）型是北方半球冬季主要的遥相关型之一，其主要特征是远东和西北太平洋的气压场呈现南北向的偶极异常。合成分析表明，月高度距平具有斜压结构，其相线在对流层低层随高度向西南倾斜。因此，异常不仅可以产生一个向极的热通量跨越气候热梯度的强太平洋急流，但也向西的热通量跨越气候热梯度之间的北太平洋和较冷的亚洲大陆。由此产生的气候平均气流有效位能（APE）的斜压转换对APE维持月WP型的贡献最大，它可以对抗与下垫面的异常热交换、副热带的异常降水以及大气环流的影响所产生的强热阻尼效应。
AbstractThe western Pacific (WP) pattern, characterized by north–south dipolar anomalies in pressure over the Far East and western North Pacific, is known as one of the dominant teleconnection patterns in the wintertime Northern Hemisphere. Composite analysis reveals that monthly height anomalies exhibit baroclinic structure with their phase lines tilting southwestward with height in the lower troposphere. The anomalies can thus yield not only a poleward heat flux across the climatological thermal gradient across the strong Pacific jet but also a westward heat flux across the climatological thermal gradient between the North Pacific and the cooler Asian continent. The resultant baroclinic conversion of available potential energy (APE) from the climatological-mean flow contributes most efficiently to the APE maintenance of the monthly WP pattern, acting against strong thermal damping effects by anomalous heat exchanges with the underlying ocean and anomalous precipitation in the subtropics and by the effec...