气候变化领域集成服务门户(CCPortal): Linear and nonlinear winter atmospheric responses to extreme phases of low frequency Pacific sea surface temperature variability

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DOI	10.1007/s00382-018-4127-1
	Linear and nonlinear winter atmospheric responses to extreme phases of low frequency Pacific sea surface temperature variability
	Cao D.; Wu Q.; Hu A.; Yao Y.; Liu S.; Schroeder S.R.; Yang F.
发表日期	2019
ISSN	0930-7575
起始页码	49
结束页码	68
卷号	52 期号:2020-01-02
英文摘要	This study examines Northern Hemisphere winter (DJFM) atmospheric responses to opposite strong phases of interdecadal (low frequency, LF) Pacific sea surface temperature (SST) forcing, which resembles El Niño-Southern Oscillation (ENSO) on a longer time scale, in observations and GFDL and CAM4 model simulations. Over the Pacific–North America (PNA) sector, linear observed responses of 500-hPa height (Z500) anomalies resemble the PNA teleconnection pattern, but show a PNA-like nonlinear response because of a westward Z500 shift in the negative (LF−) relative to the positive LF (LF+) phase. Significant extratropical linear responses include a North Atlantic Oscillation (NAO)-like Z500 anomaly, a dipole-like Z500 anomaly over northern Eurasia associated with warming over mid-high latitude Eurasia, and a Southern Annular anomaly pattern associated with warming in southern land areas. Significant nonlinear Z500 responses also include a NAO-like anomaly pattern. Models forced by LF+ and LF− SST anomalies reproduce many aspects of observed linear and nonlinear responses over the Pacific–North America sector, and linear responses over southern land, but not in the North Atlantic–European sector and Eurasia. Both models simulate PNA-like linear responses in the North Pacific–North America region similar to observed, but show larger PNA-like LF+ responses, resulting in a PNA nonlinear response. The nonlinear PNA responses result from both nonlinear western tropical Pacific rainfall changes and extratropical transient eddy feedbacks. With LF tropical Pacific forcing only (LFTP+ and LFTP−, climatological SST elsewhere), CAM4 simulates a significant NAO response to LFTP−, including a linear negative and nonlinear positive NAO response. © 2018, The Author(s).
英文关键词	Atmospheric response; Interdecadal variability; Low frequency; Nonlinear; Sea surface temperature
语种	英语
scopus关键词	atmospheric dynamics; computer simulation; decadal variation; El Nino-Southern Oscillation; extreme event; frequency analysis; linearity; nonlinearity; North Atlantic Oscillation; numerical model; sea surface temperature; Pacific Ocean; Pacific Ocean (North)
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/146599
作者单位	School of Atmospheric Sciences, Nanjing University, Nanjing, Jiangsu 210023, China; Institute of Atmospheric Sciences, Fudan University, Shanghai, 200433, China; National Center for Atmospheric Research, Boulder, CO, United States; Department of Atmospheric Sciences, Texas A&M University, College Station, TX, United States
推荐引用方式 GB/T 7714	Cao D.,Wu Q.,Hu A.,et al. Linear and nonlinear winter atmospheric responses to extreme phases of low frequency Pacific sea surface temperature variability[J],2019,52(2020-01-02).
APA	Cao D..,Wu Q..,Hu A..,Yao Y..,Liu S..,...&Yang F..(2019).Linear and nonlinear winter atmospheric responses to extreme phases of low frequency Pacific sea surface temperature variability.Climate Dynamics,52(2020-01-02).
MLA	Cao D.,et al."Linear and nonlinear winter atmospheric responses to extreme phases of low frequency Pacific sea surface temperature variability".Climate Dynamics 52.2020-01-02(2019).