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An idealized study of the impact of extratropical climate change on El Nino-Southern Oscillation
Zhang, Q; Yang, HJ; Zhong, YF; Wang, DX; hjyang@pku.edu.cn
2005
Source PublicationCLIMATE DYNAMICS
ISSN0930-7575
Volume25Issue:40732Pages:869-880
AbstractExtratropical impacts on the tropical El Nino-Southern Oscillation (ENSO) are studied in a coupled climate model. Idealized experiments show that the remote impact of the extratropics on the equatorial thermocline through oceanic tunnel can substantially modulate the ENSO in both magnitude and frequency. First of all, an extratropical warming can be conveyed to the equator by the mean subduction current, resulting in a warming of the equatorial thermocline. Second, the extratropical warming can weaken the Hadley cells, which in turn slow down the mean shallow meridional overturning circulations in the upper Pacific, reducing the equatorward cold water supply and the equatorial upwelling. These oceanic dynamic processes would weaken the stratification of the equatorial thermocline and retard a buildup (purge) of excess heat content along the equator, and finally result in a weaker and longer ENSO cycle. This study highlights a nonlocal mechanism in which ENSO behavior is related to the extratropical climate conditions.
DepartmentPeking Univ, Sch Phys, Dept Atmospher Sci, Beijing 100871, Peoples R China; Chinese Acad Sci, Inst Atmospher Sci, LASG, Beijing, Peoples R China; Peking Univ, Sch Phys, Lab Severe Storm & Flood Disasters, Beijing 100871, Peoples R China; Univ Wisconsin, Ctr Climat Res, Madison, WI USA; Univ Wisconsin, Dept Atmospher & Ocean Sci, Madison, WI USA; Chinese Acad Sci, S China Sea Inst Oncol, Lab Trop Marine Environm Dynam, Guangzhou, Peoples R China
Subject AreaMeteorology & Atmospheric Sciences
Indexed Bysci
Funding ProjectLED
WOS IDWOS:000233240800012
Citation statistics
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/5689
Collection热带海洋环境国家重点实验室(LTO)
Corresponding Authorhjyang@pku.edu.cn
Recommended Citation
GB/T 7714
Zhang, Q,Yang, HJ,Zhong, YF,et al. An idealized study of the impact of extratropical climate change on El Nino-Southern Oscillation[J]. CLIMATE DYNAMICS,2005,25(40732):869-880.
APA Zhang, Q,Yang, HJ,Zhong, YF,Wang, DX,&hjyang@pku.edu.cn.(2005).An idealized study of the impact of extratropical climate change on El Nino-Southern Oscillation.CLIMATE DYNAMICS,25(40732),869-880.
MLA Zhang, Q,et al."An idealized study of the impact of extratropical climate change on El Nino-Southern Oscillation".CLIMATE DYNAMICS 25.40732(2005):869-880.
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