Atmospheric Teleconnections of Tropical Atlantic Variability: Interhemispheric, Tropical–Extratropical, and Cross-Basin Interactions
Atmospheric Teleconnections of Tropical Atlantic Variability: Interhemispheric, Tropical–Extratropical, and Cross-Basin Interactions
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DOI：
10.1175/jcli4019.1
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发表时间：
2007-03
影响因子：
4.9
通讯作者：
Lixin Wu;F. He;Zhengyu Liu;Chun Li
中科院分区：
文献类型：
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作者：
Lixin Wu;F. He;Zhengyu Liu;Chun Li
摘要本文通过一系列海气耦合模式试验研究了热带大西洋海温变率的大气遥相关。结果表明，热带大西洋气候不仅具有明显的南北联系，而且对北大西洋涛动（NAO）和厄尔尼诺-南方涛动（ENSO）也有显著的影响。在春季，热带大西洋SST表现出一个由风-蒸发-SST（WES）反馈控制的半球间跷跷板，随后通过ITCZ的季节性迁移的调解而衰减。在北大西洋，热带大西洋SST可以迫使一个显着的耦合NAO偶极子SST响应在春季，改变到耦合波列马蹄SST响应在接下来的夏季和秋季，并在未来的冬季NAO复发。大气响应的季节变化以及下一个冬季NAO的重现主要受热带大西洋海温的驱动。
Abstract In this paper, the atmospheric teleconnections of the tropical Atlantic SST variability are investigated in a series of coupled ocean–atmosphere modeling experiments. It is found that the tropical Atlantic climate not only displays an apparent interhemispheric link, but also significantly influences the North Atlantic Oscillation (NAO) and the El Nino–Southern Oscillation (ENSO). In spring, the tropical Atlantic SST exhibits an interhemispheric seesaw controlled by the wind–evaporation–SST (WES) feedback that subsequently decays through the mediation of the seasonal migration of the ITCZ. Over the North Atlantic, the tropical Atlantic SST can force a significant coupled NAO–dipole SST response in spring that changes to a coupled wave train–horseshoe SST response in the following summer and fall, and a recurrence of the NAO in the next winter. The seasonal changes of the atmospheric response as well as the recurrence of the next winter’s NAO are driven predominantly by the tropical Atlantic SST it...