气候变化领域集成服务门户(CCPortal): Indian Ocean warming modulates global atmospheric circulation trends

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DOI	10.1007/s00382-020-05369-1
	Indian Ocean warming modulates global atmospheric circulation trends
	Dhame S.; Taschetto A.S.; Santoso A.; Meissner K.J.
发表日期	2020
ISSN	0930-7575
起始页码	2053
结束页码	2073
卷号	55
英文摘要	The Indian Ocean has warmed rapidly and notably at a faster rate than the other tropical ocean basins in the latter half of the twentieth century. We conduct sensitivity experiments using an atmospheric general circulation model to determine the impact of Indian Ocean surface warming on large-scale global atmospheric circulation trends and rainfall distribution, in terms of its pattern and magnitude. Indian Ocean warming drives changes in the local Indian Ocean Walker cell that leads to anomalous easterlies over the Pacific Ocean and strengthens the Pacific Walker Circulation. The anomalous Indian Ocean Walker cell results in anomalous subsidence over Central Africa and the tropical Atlantic, where it is associated with a precipitation decrease over the equator. During austral summer, Indian Ocean warming is associated with the intensification of the northern hemisphere Hadley cell and strengthening of the extratropical atmospheric circulation resembling a positive North Atlantic Oscillation. During austral winter, it is associated with weakening of the southern hemisphere Hadley cell and strengthening of a positive Southern Annular Mode pattern. More intensive warming in the western region of the Indian Ocean basin compared to the east has a significant impact on rainfall trends in the basin, easterly wind trend in the western Pacific and intensity of Hadley circulation changes. It is, however, the Indian Ocean warming across the entire basin that dominates the drying of the tropical Atlantic and the trends in extratropical modes of variability. This study suggests the Indian Ocean warming could have potentially influenced global atmospheric circulation trends observed in the recent decades. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Atmospheric teleconnections; Indian Ocean warming; Inter-basin interaction; Walker and Hadley circulation
语种	英语
scopus关键词	atmospheric circulation; atmospheric general circulation model; climate change; extratropical environment; Hadley cell; North Atlantic Oscillation; rainfall; sea surface temperature; Walker circulation; warming; Atlantic Ocean; Atlantic Ocean (Tropical); Indian Ocean; Pomatiopsis californica
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/145320
作者单位	Climate Change Research Centre and ARC Centre of Excellence for Climate Extremes, University of New South Wales, Sydney, Australia; Centre for Southern Hemisphere Oceans Research (CSHOR), CSIRO Oceans and Atmosphere, Hobart, 7004, Australia
推荐引用方式 GB/T 7714	Dhame S.,Taschetto A.S.,Santoso A.,et al. Indian Ocean warming modulates global atmospheric circulation trends[J],2020,55.
APA	Dhame S.,Taschetto A.S.,Santoso A.,&Meissner K.J..(2020).Indian Ocean warming modulates global atmospheric circulation trends.Climate Dynamics,55.
MLA	Dhame S.,et al."Indian Ocean warming modulates global atmospheric circulation trends".Climate Dynamics 55(2020).