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Role of Air-Sea Interaction in the Long Persistence of El Nino-Induced North Indian Ocean Warming
Du, Y; Xie, SP; Huang, G; Hu, KM;
Source PublicationJOURNAL OF CLIMATE
AbstractEl 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.
Department[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
Subject AreaMeteorology & Atmospheric Sciences
Indexed Bysci
Funding ProjectLED
WOS IDWOS:000266002800009
Citation statistics
Cited Times:257[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Recommended Citation
GB/T 7714
Du, Y,Xie, SP,Huang, G,et al. Role of Air-Sea Interaction in the Long Persistence of El Nino-Induced North Indian Ocean Warming[J]. JOURNAL OF CLIMATE,2009,22(8):2023-2038.
APA Du, Y,Xie, SP,Huang, G,Hu, KM,& of Air-Sea Interaction in the Long Persistence of El Nino-Induced North Indian Ocean Warming.JOURNAL OF CLIMATE,22(8),2023-2038.
MLA Du, Y,et al."Role of Air-Sea Interaction in the Long Persistence of El Nino-Induced North Indian Ocean Warming".JOURNAL OF CLIMATE 22.8(2009):2023-2038.
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