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Rapid termination of the 2006 El Ni_o and its relation to the Indian Ocean

机译:2006年厄尔尼诺事件的迅速终止及其与印度洋的关系

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摘要

We investigated the rapid termination of the 2006 El Ni_o using observed data and a coupled ocean-atmosphere general circulation model (CGCM). Observed data showed development of an anomalous South Indian Ocean (SIO) anticyclone associated with the concurrent Indian Ocean Dipole during September-November 2006. At the end of 2006, the eastward retreat of the SIO anticyclone in response to the Indian Ocean warming generated an easterly anomaly over the western Pacific, and the resultant oceanic upwelling Kelvin wave terminated the El Ni_o. CGCM experiments indicated that the formation of the SIO anticyclone was influenced remotely by the Pacific Ocean SST anomalies, and that the easterly anomaly over the western Pacific at the end of 2006 was reinforced by the Indian Ocean SST anomalies. These results suggest that interactive feedback between the Indian and Pacific Oceans helped the rapid termination of the 2006 event.
机译:我们使用观测数据和耦合的海洋-大气总环流模型(CGCM)调查了2006年厄尔尼诺事件的快速终止。观察到的数据显示,在2006年9月至11月期间,与同时发生的印度洋偶极子相关的南印度洋(SIO)反气旋异常发展。2006年底,印度洋变暖引起的SIO反气旋东退,产生了东风。西太平洋异常,由此产生的海洋上升开尔文波终止了厄尔尼诺现象。 CGCM实验表明,SIO反气旋的形成受到太平洋SST异常的远距离影响,而2006年底印度洋SST异常又增强了西太平洋的东风异常。这些结果表明,印度洋和太平洋之间的互动反馈有助于2006年事件的迅速终止。

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