气候变化领域集成服务门户(CCPortal): Quasi-stationary extratropical wave trains associated with distinct tropical Pacific seasonal mean convection patterns: observational and AMIP model results

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DOI	10.1007/s00382-019-04882-2
	Quasi-stationary extratropical wave trains associated with distinct tropical Pacific seasonal mean convection patterns: observational and AMIP model results
	Ding S.; Chen W.; Graf H.-F.; Chen Z.; Ma T.
发表日期	2019
ISSN	0930-7575
起始页码	2451
结束页码	2476
卷号	53 期号:2020-03-04
英文摘要	In this paper, mechanisms for the formation of quasi-stationary extratropical wave trains associated with four distinct winter patterns of seasonal mean tropical Pacific convection anomalies, including the western CP (W-CP) pattern, La Niña (LN) pattern, CP El Niño (CPEN) pattern and EP El Niño (EPEN) pattern, are investigated by utilizing observational and six Atmospheric Model Intercomparison Project Phase 5 (AMIP5) high-skilled models (ACCESS1.0, CanAM4, CCSM4, CMCC-CM, HadGEM2-A, MPI-ESM-LR) datasets. The observational results show that tropical Pacific forcing induces upper-level anomalous Rossby wave source that force vorticity over the central North Pacific through modulating the local Hadley circulation, then excite eastward propagation of quasi-stationary planetary waves penetrating into the North Atlantic, and finally establish the associated teleconnections in mid- and high-latitudes by local synoptic eddy–mean flow interaction. Different structures of wave trains may be explained by evident differences in intensity and scale of the extratropical vorticity forcing originating from distinct convection anomalies over the tropical Pacific. The MME results further confirm the possible physical processes obtained from observations, but there still exist some significant differences. These cover the North Pacific and North America and can possibly be attributed to the models’ simulation ability of extratropical vorticity forcing and local storm track intensity. In addition, the stratosphere–troposphere interaction plays an important role for extratropical atmospheric circulation anomalies. The stratospheric polar vortex not only modulates the underlying wave train, especially for the North Atlantic/Europe sector, but is also affected by the upper-tropospheric disturbance in high-latitudes through the upward wave activity flux. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Extratropical vorticity forcing; Extratropical wave train; Storm track; Synoptic eddy–mean flow interaction; Tropical Pacific convection
语种	英语
scopus关键词	atmospheric convection; extratropical environment; Hadley cell; large eddy simulation; seasonal variation; storm track; synoptic meteorology; tropical cyclone; vorticity; North America; 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/146085
作者单位	Institute of Atmospheric Sciences, Fudan University, Shanghai, China; Center for Monsoon System Research, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100190, China; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, China; School of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu, China
推荐引用方式 GB/T 7714	Ding S.,Chen W.,Graf H.-F.,et al. Quasi-stationary extratropical wave trains associated with distinct tropical Pacific seasonal mean convection patterns: observational and AMIP model results[J],2019,53(2020-03-04).
APA	Ding S.,Chen W.,Graf H.-F.,Chen Z.,&Ma T..(2019).Quasi-stationary extratropical wave trains associated with distinct tropical Pacific seasonal mean convection patterns: observational and AMIP model results.Climate Dynamics,53(2020-03-04).
MLA	Ding S.,et al."Quasi-stationary extratropical wave trains associated with distinct tropical Pacific seasonal mean convection patterns: observational and AMIP model results".Climate Dynamics 53.2020-03-04(2019).