气候变化领域集成服务门户(CCPortal): The effect of the equatorial Pacific cold SST bias on simulated ENSO teleconnections to the North Pacific and California

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DOI	10.1007/s00382-019-04746-9
	The effect of the equatorial Pacific cold SST bias on simulated ENSO teleconnections to the North Pacific and California
	Bayr T.; Domeisen D.I.V.; Wengel C.
发表日期	2019
ISSN	0930-7575
起始页码	3771
结束页码	3789
卷号	53 期号:2020-07-08
英文摘要	Precipitation in California is modulated by variability in the tropical Pacific associated with El Niño/Southern Oscillation (ENSO): more rainfall is expected during El Niño episodes, and reduced rainfall during La Niña. It has been suggested that besides the shape and location of the sea surface temperature (SST) anomaly this remote connection depends on the strength and location of the atmospheric convection response in the tropical Pacific. Here we show in a perturbed physics ensemble of the Kiel Climate Model and CMIP5 models that due to a cold equatorial SST bias many climate models are in a La Niña-like mean state, resulting in a too westward position of the rising branch of the Pacific Walker Circulation. This in turn results in a convective response along the equator during ENSO events that is too far west in comparison to observations. This effect of the equatorial cold SST bias is not restricted to the tropics, moreover it leads to a too westward SLP response in the North Pacific and too westward precipitation response that does not reach California. Further we show that climate models with a reduced equatorial cold SST bias have a more realistic representation of the spatial asymmetry of the teleconnections between El Niño and La Niña. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	CMIP5; El Niño/Southern Oscillation; North Pacific teleconnections; Perturbed physics ensemble; Rainfall over California; Sea surface temperature bias
语种	英语
scopus关键词	air-sea interaction; atmospheric convection; computer simulation; El Nino-Southern Oscillation; equatorial dynamics; numerical model; perturbation; rainfall; sea surface temperature; teleconnection; Walker circulation; California; Pacific Ocean; Pacific Ocean (Equatorial); Pacific Ocean (North); United States; Pomatiopsis californica
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/145996
作者单位	GEOMAR Helmholtz Centre for Ocean Research, Düsternbrooker Weg 20, Kiel, 24105, Germany; Institute for Atmospheric and Climate Science, ETH Zürich, Switzerland
推荐引用方式 GB/T 7714	Bayr T.,Domeisen D.I.V.,Wengel C.. The effect of the equatorial Pacific cold SST bias on simulated ENSO teleconnections to the North Pacific and California[J],2019,53(2020-07-08).
APA	Bayr T.,Domeisen D.I.V.,&Wengel C..(2019).The effect of the equatorial Pacific cold SST bias on simulated ENSO teleconnections to the North Pacific and California.Climate Dynamics,53(2020-07-08).
MLA	Bayr T.,et al."The effect of the equatorial Pacific cold SST bias on simulated ENSO teleconnections to the North Pacific and California".Climate Dynamics 53.2020-07-08(2019).