Northern hemisphere teleconnection patterns during extreme phases of the zonal-mean circulation
Northern hemisphere teleconnection patterns during extreme phases of the zonal-mean circulation
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DOI：
10.1175/1520-0442(1996)009
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发表时间：
1996-10
影响因子：
4.9
通讯作者：
M. Ting;M. Hoerling;Taiyi Xu;Arun Kumar
中科院分区：
文献类型：
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作者：
M. Ting;M. Hoerling;Taiyi Xu;Arun Kumar
摘要本文研究了区域气候异常与对流层纬向平均纬向风的年际变化。本研究的重点是冬季北方半球的热带外，并比较季节平均异常与厄尔尼诺南方涛动在1947年至1994年期间与厄尔尼诺。动力学模式试验表明，在北方半球的外热带地区，以35°和55°N处的异相环流异常为特征的单一纬向指数对纬向气流/驻波相互作用是至关重要的。这种波动的纬向平均纬向流的热带SST变率，与早期的研究一致的独立发生。动力学模型实验和回归分析的历史数据表明，这样的纬向指数解释了一个显着的部分冬季驻波变率在几个地区。主要的活动中心位于北太平洋-北美的波列内。
Abstract Regional climate, anomalies associated with year-to-year changes in the tropospheric zonal-mean zonal wind (ū) are examined. This study focuses on the wintertime Northern Hemisphere extratropics and compares seasonal mean anomalies associated with ū to those associated with the El Nino–Southern Oscillation during the 1947–94 period. Dynamical model experiments indicate that a single zonal index, characterized by out-of-phase ū anomalies at 35° and 55°N, is of primary importance for zonal flow/stationary wave interactions in the Northern Hemisphere extratropies. Such fluctuations in the zonal-mean zonal flow are shown to occur independently of tropical SST variability, consistent with earlier studies. Dynamical model experiments and regression analyses of the historical data indicate that such a zonal index explains a significant fraction of the wintertime stationary wave variability in several regions. The principal centers of action reside within wave trains over the North Pacific–North American...