Global Teleconnections in Response to a Shutdown of the Atlantic Meridional Overturning Circulation
Global Teleconnections in Response to a Shutdown of the Atlantic Meridional Overturning Circulation
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DOI：
10.1175/2007jcli1858.1
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发表时间：
2008-06
影响因子：
4.9
通讯作者：
Lixin Wu;Chun Li;Chunxue Yang;S. Xie
中科院分区：
文献类型：
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作者：
Lixin Wu;Chun Li;Chunxue Yang;S. Xie
摘要利用海洋-大气耦合环流模式进行水-管试验，研究了大西洋经向翻转环流（AMOC）停止的全球响应。在该模型中，北大西洋次极地淡水的增加切断了AMOC。北大西洋温带地区的强烈降温在全球海洋上引起了广泛的反应。在热带大西洋，海面温度（SST）偶极子形成，赤道以北变冷，而赤道以南变暖。这种热带偶极子在6 - 12月最为明显，向南取代了大西洋热带辐合带。在热带太平洋，海温偶极子在北方春季形成，以响应中美洲东北贸易的加强，并触发类似厄尔尼诺的变暖发展，在北方秋季在赤道达到顶峰。在温带北太平洋，整个盆地冷却约1°C，温度总体向西增加。
Abstract The global response to a shutdown of the Atlantic meridional overturning circulation (AMOC) is investigated by conducting a water-hosing experiment with a coupled ocean–atmosphere general circulation model. In the model, the addition of freshwater in the subpolar North Atlantic shuts off the AMOC. The intense cooling in the extratropical North Atlantic induces a widespread response over the global ocean. In the tropical Atlantic, a sea surface temperature (SST) dipole forms, with cooling north and warming on and south of the equator. This tropical dipole is most pronounced in June–December, displacing the Atlantic intertropical convergence zone southward. In the tropical Pacific, a SST dipole forms in boreal spring in response to the intensified northeast trades across Central America and triggering the development of an El Nino–like warming that peaks on the equator in boreal fall. In the extratropical North Pacific, a basinwide cooling of ∼1°C takes place, with a general westward increase in in...