A Simple GCM Study on the Relationship between ENSO and the Southern Annular Mode

doi:10.1175/JAS-D-12-0161.1

IOCAS-IR > 海洋环流与波动重点实验室

	A Simple GCM Study on the Relationship between ENSO and the Southern Annular Mode
	Gong, Tingting 1,2; Feldstein, Steven B.2; Luo, Dehai 3; Gong, TT
	2013-06-01
发表期刊	JOURNAL OF THE ATMOSPHERIC SCIENCES
ISSN	0022-4928
卷号	70 期号:6 页码:1821-1832
文章类型	Article
摘要	This study investigates the relationship between El Nino-Southern Oscillation (ENSO) and southern annular mode (SAM) events with an idealized general circulation model. A series of model calculations are performed to examine why positive (negative) intraseasonal SAM events are observed to occur much more frequently during La Nina (El Nino). Seven different model runs are performed: a control run, three El Nino runs (the first with a zonally symmetric heating field, the second with a zonally asymmetric heating/cooling field, and the third that combines both fields), and three La Nina runs (with heating fields of opposite sign).; This study investigates the relationship between El Nino-Southern Oscillation (ENSO) and southern annular mode (SAM) events with an idealized general circulation model. A series of model calculations are performed to examine why positive (negative) intraseasonal SAM events are observed to occur much more frequently during La Nina (El Nino). Seven different model runs are performed: a control run, three El Nino runs (the first with a zonally symmetric heating field, the second with a zonally asymmetric heating/cooling field, and the third that combines both fields), and three La Nina runs (with heating fields of opposite sign). The model runs with the zonally symmetric and combined heating fields are found to yield the same relationship between the phase of ENSO and the preferred phase for SAM events as is observed in the atmosphere. In contrast, the zonally asymmetric model runs are found to have the opposite SAM-ENSO phase preference characteristics. Since a reduced midlatitude meridional potential vorticity gradient has been linked to a greater frequency of positive-phase SAM events, and vice versa for negative SAM events, the meridional potential vorticity gradient in the various model runs was compared. The results suggest that the phase preference of SAM events during ENSO arises from the impact of the zonal-mean heating on the midlatitude meridional potential vorticity gradient.
学科领域	Meteorology & Atmospheric Sciences
DOI	10.1175/JAS-D-12-0161.1
URL	查看原文
收录类别	SCI
语种	英语
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
WOS记录号	WOS:000319668400019
WOS关键词	NORTH-ATLANTIC OSCILLATION ; ROSSBY-WAVE-BREAKING ; ZONAL FLOW FEEDBACK ; SUBTROPICAL TROPOPAUSE ; CLIMATE VARIABILITY ; CIRCULATION ; HEMISPHERE ; TELECONNECTION ; LATITUDE ; SPECTRA
WOS标题词	Science & Technology ; Physical Sciences
引用统计	被引频次：19[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/16389
专题	海洋环流与波动重点实验室
通讯作者	Gong, TT
作者单位	1.Chinese Acad Sci, Inst Oceanog, Qingdao 266071, Peoples R China 2.Penn State Univ, Dept Meteorol, University Pk, PA 16802 USA 3.Chinese Acad Sci, Inst Atmospher Phys, RCE TEA, Beijing, Peoples R China
第一作者单位	中国科学院海洋研究所
推荐引用方式 GB/T 7714	Gong, Tingting,Feldstein, Steven B.,Luo, Dehai,et al. A Simple GCM Study on the Relationship between ENSO and the Southern Annular Mode[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2013,70(6):1821-1832.
APA	Gong, Tingting,Feldstein, Steven B.,Luo, Dehai,&Gong, TT.(2013).A Simple GCM Study on the Relationship between ENSO and the Southern Annular Mode.JOURNAL OF THE ATMOSPHERIC SCIENCES,70(6),1821-1832.
MLA	Gong, Tingting,et al."A Simple GCM Study on the Relationship between ENSO and the Southern Annular Mode".JOURNAL OF THE ATMOSPHERIC SCIENCES 70.6(2013):1821-1832.

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