| 两类El Niño事件赤道洋流的异常对东太平洋SST的影响 |
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| 引用本文： | 常蕊,张庆云.两类El Niño事件赤道洋流的异常对东太平洋SST的影响[J].大气和海洋科学快报,2008,1(1):57-63. |
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| 作者姓名： | 常蕊 张庆云 |
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| 作者单位： | 中国科学院大气物理研究所灾害性气候研究与预测中心；中国科学院研究生院，北京,中国科学院大气物理研究所灾害性气候研究与预测中心；中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室，北京 |
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| 摘 要： |
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| 收稿时间： | 5/4/2008 12:00:00 AM |
The Role of the Equatorial Currents on the Evolution of SSTA in the Eastern Pacific during Two Different Kinds of El Niño Events |
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| CHANG Rui and ZHANG Qing-Yun.The Role of the Equatorial Currents on the Evolution of SSTA in the Eastern Pacific during Two Different Kinds of El Niño Events[J].Atmospheric and Oceanic Science Letters,2008,1(1):57-63. |
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| Authors: | CHANG Rui and ZHANG Qing-Yun |
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| Abstract: | Based on the Simple Ocean Data Assimilation (SODA) from 1970 to 2001, equatorial currents and their association with the warm water propagation mechanism during two patterns of El Niño events are studied. In this study, the middle-pattern of El Ni?o (ME) and the eastern-pattern of El Niño (EE) events are defined as anomalous warm water originating first to the west and the east of 120°W, respectively. It is pointed out that the westerly and eastward anomalous currents in the western Pacific are stronger during the ME event than the EE event, which is conducive to the eastward migration of warm water from western Pacific by zonal advection of temperature. In contrast, the weaker westerly and the westward anomalous currents east of the dateline would be unfavorable for the eastward migration of warm water during EE events. More importantly, another propagation mechanism of the warm water is attributed to the anomalous convergence of the surface currents, as well as the anomalous divergence of the subsurface currents, which obstruct the upwelling of colder water from the deep ocean. Meanwhile, the anomalous convergence of the surface currents and the anomalous divergence of the subsurface currents maintain eastward migration, which plays an important role in the eastward migration of the warm water during ME events. Although there is anomalous convergence in the upper ocean and anomalous divergence in the subsurface ocean during EE events, they appear quasi-stationary in the western Pacific. The warm water over the eastern Pacific during EE events is caused by the local anomalous convergence of surface currents and the anomalous divergence of subsurface currents. |
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| Keywords: | middle-pattern of El Niñ o eastern-pattern of El Niñ o equatorial currents |
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