Twentieth century Walker Circulation change: data analysis and model experiments

doi:10.1007/s00382-011-1047-8

IOCAS-IR > 海洋环流与波动重点实验室

	Twentieth century Walker Circulation change: data analysis and model experiments
	Meng, Qingjia 1,2,3; Latif, Mojib 1; Park, Wonsun 1; Keenlyside, Noel S.1; Semenov, Vladimir A.1,4; Martin, Thomas 1; Latif, M (reprint author), Leibniz Inst Meereswissensch, D-24105 Kiel, Germany.
	2012-05-01
发表期刊	CLIMATE DYNAMICS
ISSN	0930-7575
卷号	38 期号:9-10 页码:1757-1773
文章类型	Article
摘要	Recent studies indicate a weakening of the Walker Circulation during the twentieth century. Here, we present evidence from an atmospheric general circulation model (AGCM) forced by the history of observed sea surface temperature (SST) that the Walker Circulation may have intensified rather than weakened. Observed Equatorial Indo-Pacific Sector SST since 1870 exhibited a zonally asymmetric evolution: While the eastern part of the Equatorial Pacific showed only a weak warming, or even cooling in one SST dataset, the western part and the Equatorial Indian Ocean exhibited a rather strong warming. This has resulted in an increase of the SST gradient between the Maritime Continent and the eastern part of the Equatorial Pacific, one driving force of the Walker Circulation. The ensemble experiments with the AGCM, with and without time-varying external forcing, suggest that the enhancement of the SST gradient drove an anomalous atmospheric circulation, with an enhancement of both Walker and Hadley Circulation. Anomalously strong precipitation is simulated over the Indian Ocean and anomalously weak precipitation over the western Pacific, with corresponding changes in the surface wind pattern. Some sensitivity to the forcing SST, however, is noticed. The analysis of twentieth century integrations with global climate models driven with observed radiative forcing obtained from the Coupled Model Intercomparison Project (CMIP) database support the link between the SST gradient and Walker Circulation strength. Furthermore, control integrations with the CMIP models indicate the existence of strong internal variability on centennial timescales. The results suggest that a radiatively forced signal in the Walker Circulation during the twentieth century may have been too weak to be detectable.
关键词	Tropical Atmospheric Circulation Twentieth Century Walker Circulation
学科领域	Meteorology & Atmospheric Sciences
DOI	10.1007/s00382-011-1047-8
URL	查看原文
收录类别	SCI
语种	英语
WOS记录号	WOS:000303448300005
引用统计	被引频次：90[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/337002/12202
专题	海洋环流与波动重点实验室
通讯作者	Latif, M (reprint author), Leibniz Inst Meereswissensch, D-24105 Kiel, Germany.
作者单位	1.Leibniz Inst Meereswissensch, D-24105 Kiel, Germany 2.Chinese Res Inst Environm Sci, River & Coastal Environm Res Ctr, Beijing 100012, Peoples R China 3.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao 266071, Peoples R China 4.Russian Acad Sci, AM Obukhov Inst Atmospher Phys, Moscow, Russia
第一作者单位	海洋环流与波动重点实验室
推荐引用方式 GB/T 7714	Meng, Qingjia,Latif, Mojib,Park, Wonsun,et al. Twentieth century Walker Circulation change: data analysis and model experiments[J]. CLIMATE DYNAMICS,2012,38(9-10):1757-1773.
APA	Meng, Qingjia.,Latif, Mojib.,Park, Wonsun.,Keenlyside, Noel S..,Semenov, Vladimir A..,...&Latif, M .(2012).Twentieth century Walker Circulation change: data analysis and model experiments.CLIMATE DYNAMICS,38(9-10),1757-1773.
MLA	Meng, Qingjia,et al."Twentieth century Walker Circulation change: data analysis and model experiments".CLIMATE DYNAMICS 38.9-10(2012):1757-1773.

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