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学科主题: Meteorology & Atmospheric Sciences
题名: Role of Air-Sea Interaction in the Long Persistence of El Nino-Induced North Indian Ocean Warming
作者: Du, Y ; Xie, SP ; Huang, G ; Hu, KM
通讯作者: duyan@scsio.ac.cn
刊名: JOURNAL OF CLIMATE
发表日期: 2009
卷: 22, 期:8, 页:2023-2038
收录类别: sci
部门归属: [Du, Yan] Chinese Acad Sci, Key Lab Trop Marine Environm Dynam, S China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China; [Du, Yan; Xie, Shang-Ping] Univ Hawaii Manoa, Int Pacific Res Ctr, Honolulu, HI 96822 USA; [Xie, Shang-Ping] Univ Hawaii Manoa, Dept Meteorol, Honolulu, HI 96822 USA; [Huang, Gang; Hu, Kaiming] Chinese Acad Sci, Inst Atmospher Phys, Beijing, Peoples R China
项目归属: LED
摘要: El Nino induces a basin-wide increase in tropical Indian Ocean (TIO) sea surface temperature (SST) with a lag of one season. The north IO (NIO), in particular, displays a peculiar double-peak warming with the second peak larger in magnitude and persisting well through the summer. Motivated by recent studies suggesting the importance of the TIO warming for the Northwest Pacific and East Asian summer monsoons, the present study investigates the mechanisms for the second peak of the NIO warming using observations and general circulation models. This analysis reveals that internal air-sea interaction within the TIO is key to sustaining the TIO warming through summer. During El Nino, anticyclonic wind curl anomalies force a downwelling Rossby wave in the south TIO through Walker circulation adjustments, causing a sustained SST warming in the tropical southwest IO (SWIO) where the mean thermocline is shallow. During the spring and early summer following El Nino, this SWIO warming sustains an antisymmetric pattern of atmospheric anomalies with northeasterly ( northwesterly) wind anomalies north ( south) of the equator. Over the NIO as the mean winds turn into southwesterly in May, the northeasterly anomalies force the second SST peak that persists through summer by reducing the wind speed and surface evaporation. Atmospheric general circulation model experiments show that the antisymmetric atmospheric pattern is a response to the TIO warming, suggestive of their mutual interaction. Thus, ocean dynamics and Rossby waves in particular are important for the warming not only locally in SWIO but also on the basin-scale north of the equator, a result with important implications for climate predictability and prediction.
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WOS记录号: WOS:000266002800009
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/6121
Appears in Collections:热带海洋环境动力实验室(LTO)_期刊论文

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Recommended Citation:
Du, Y; Xie, SP; Huang, G; Hu, KM.Role of Air-Sea Interaction in the Long Persistence of El Nino-Induced North Indian Ocean Warming,JOURNAL OF CLIMATE,2009,22(8):2023-2038
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文件名: Role of Air-Sea Interaction in the Long Persistence of El Nino-Induced North Indian Ocean Warming.pdf
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