气候变化领域集成服务门户(CCPortal): The impact of SST biases in the tropical east pacific and agulhas current region on atmospheric stationary waves in the southern hemisphere

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DOI	10.1175/JCLI-D-20-0195.1
	The impact of SST biases in the tropical east pacific and agulhas current region on atmospheric stationary waves in the southern hemisphere
	Garfinkel C.I.; White I.; Gerber E.P.; Jucker M.
发表日期	2020
ISSN	0894-8755
起始页码	9351
结束页码	9374
卷号	33 期号:21
英文摘要	Climate models in phase 5 of the Coupled Model Intercomparison Project (CMIP5) vary significantly in their ability to simulate the phase and amplitude of atmospheric stationary waves in the midlatitude Southern Hemisphere. These models also suffer from a double intertropical convergence zone (ITCZ), with excessive precipitation in the tropical eastern South Pacific, and many also suffer from a biased simulation of the dynamics of the Agulhas Current around the tip of South Africa. The intermodel spread in the strength and phasing of SH midlatitude stationary waves in the CMIP archive is shown to be significantly correlated with the double-ITCZ bias and biases in the Agulhas Return Current. An idealized general circulation model (GCM) is used to demonstrate the causality of these links by prescribing an oceanic heat flux out of the tropical east Pacific and near the Agulhas Current. A warm bias in tropical east Pacific SSTs associated with an erroneous double ITCZ leads to a biased representation of midlatitude stationary waves in the austral hemisphere, capturing the response evident in CMIP models. Similarly, an overly diffuse sea surface temperature gradient associated with a weak Agulhas Return Current leads to an equatorward shift of the Southern Hemisphere jet by more than 38 and weak stationary wave activity in the austral hemisphere. Hence, rectification of the double-ITCZ bias and a better representation of the Agulhas Current should be expected to lead to an improved model representation of the austral hemisphere. © 2020 American Meteorological Society.
英文关键词	Electric rectifiers; Heat flux; Oceanography; Surface waters; Tropics; Atmospheric stationary waves; Coupled Model Intercomparison Project; Eastern South-Pacific; General circulation model; Intertropical convergence zone; Model representation; Sea Surface Temperature gradients; Southern Hemisphere; Climate models; air-sea interaction; boundary current; climate modeling; general circulation model; intertropical convergence zone; sea surface temperature; Southern Hemisphere; standing wave; Agulhas Current; Indian Ocean; Pacific Ocean; Pacific Ocean (East)
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/171053
作者单位	Fredy and Nadine Herrmann Institute of Earth Sciences, Hebrew University of Jerusalem, Jerusalem, Israel; Courant Institute of Mathematical Sciences, New York University, New York, NY, United States; Climate Change Research Centre, ARC Centre of Excellence for Climate Extremes, University of New South Wales, Sydney, NSW, Australia
推荐引用方式 GB/T 7714	Garfinkel C.I.,White I.,Gerber E.P.,et al. The impact of SST biases in the tropical east pacific and agulhas current region on atmospheric stationary waves in the southern hemisphere[J],2020,33(21).
APA	Garfinkel C.I.,White I.,Gerber E.P.,&Jucker M..(2020).The impact of SST biases in the tropical east pacific and agulhas current region on atmospheric stationary waves in the southern hemisphere.Journal of Climate,33(21).
MLA	Garfinkel C.I.,et al."The impact of SST biases in the tropical east pacific and agulhas current region on atmospheric stationary waves in the southern hemisphere".Journal of Climate 33.21(2020).