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Indian Ocean Capacitor Effect on Indo-Western Pacific Climate during the Summer following El Nino
Xie, SP; Hu, KM; Hafner, J; Tokinaga, H; Du, Y; Huang, G; Sampe, T; xie@hawaii.edu
2009
Source PublicationJOURNAL OF CLIMATE
ISSN0894-8755
Volume22Issue:3Pages:730-747
AbstractSignificant climate anomalies persist through the summer (June-August) after El Nino dissipates in spring over the equatorial Pacific. They include the tropical Indian Ocean (TIO) sea surface temperature (SST) warming, increased tropical tropospheric temperature, an anomalous anticyclone over the subtropical northwest Pacific, and increased mei-yu-baiu rainfall over East Asia. The cause of these lingering El Nino effects during summer is investigated using observations and an atmospheric general circulation model (GCM). The results herein indicate that the TIO warming acts like a capacitor anchoring atmospheric anomalies over the Indo-western Pacific Oceans. It causes tropospheric temperature to increase by a moist-adiabatic adjustment in deep convection, emanating a baroclinic Kelvin wave into the Pacific. In the northwest Pacific, this equatorial Kelvin wave induces northeasterly surface wind anomalies, and the resultant divergence in the subtropics triggers suppressed convection and the anomalous anticyclone. The GCM results support this Kelvin wave-induced Ekman divergence mechanism. In response to a prescribed SST increase over the TIO, the model simulates the Kelvin wave with low pressure on the equator as well as suppressed convection and the anomalous anticyclone over the subtropical northwest Pacific. An additional experiment further indicates that the north Indian Ocean warming is most important for the Kelvin wave and northwest Pacific anticyclone, a result corroborated by observations. These results have important implications for the predictability of Indo-western Pacific summer climate: the spatial distribution and magnitude of the TIO warming, rather than simply whether there is an El Nino in the preceding winter, affect summer climate anomalies over the Indo-western Pacific and East Asia.
Department[Xie, Shang-Ping] Univ Hawaii Manoa, SOEST, IPRC, Honolulu, HI 96822 USA; [Xie, Shang-Ping] Univ Hawaii Manoa, Dept Meteorol, Honolulu, HI 96822 USA; [Hu, Kaiming; Huang, Gang] Chinese Acad Sci, Inst Atmospher Phys, Beijing, Peoples R China; [Du, Yan] Chinese Acad Sci, S China Sea Inst Oceanol, Guangzhou, Guangdong, Peoples R China
Subject AreaMeteorology & Atmospheric Sciences
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Indexed Bysci
Funding ProjectLED
WOS IDWOS:000263908000016
Citation statistics
Cited Times:658[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/6169
Collection热带海洋环境国家重点实验室(LTO)
Corresponding Authorxie@hawaii.edu
Recommended Citation
GB/T 7714
Xie, SP,Hu, KM,Hafner, J,et al. Indian Ocean Capacitor Effect on Indo-Western Pacific Climate during the Summer following El Nino[J]. JOURNAL OF CLIMATE,2009,22(3):730-747.
APA Xie, SP.,Hu, KM.,Hafner, J.,Tokinaga, H.,Du, Y.,...&xie@hawaii.edu.(2009).Indian Ocean Capacitor Effect on Indo-Western Pacific Climate during the Summer following El Nino.JOURNAL OF CLIMATE,22(3),730-747.
MLA Xie, SP,et al."Indian Ocean Capacitor Effect on Indo-Western Pacific Climate during the Summer following El Nino".JOURNAL OF CLIMATE 22.3(2009):730-747.
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