DOI: 10.1007/s00382-013-1787-8
Scopus记录号: 2-s2.0-84899631462
论文题名: Indian Ocean and monsoon coupled interactions in a warming environment
作者: Swapna P. ; Krishnan R. ; Wallace J.M.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2014
卷: 42, 期: 2017-09-10 起始页码: 2439
结束页码: 2454
语种: 英语
英文关键词: Equatorial westerlies
; Indian Ocean warming
; Weakening of boreal summer monsoon winds
英文摘要: Several studies have drawn attention to the steady warming of the equatorial and tropical Indian Ocean (IO) sea surface temperature (SST) observed during recent decades. An intriguing aspect of the IO SST warming trend is that it is has been accompanied by a pronounced weakening of the large-scale boreal summer monsoon circulation. Based on a detailed diagnostic analysis of observed datasets, reanalysis products and IPCC AR4 coupled model output, this study examines how the observed changes in the summer monsoon circulation could have contributed to this SST warming trend. The present results reveal that the weakening trend of the summer monsoon cross-equatorial flow has favored a reorientation of surface westerlies towards the equatorial IO during recent decades, relative to summer monsoons of earlier decades, which were dominated by stronger cross-equatorial flow. Our analysis suggests that the weakening of the summer monsoon cross-equatorial flow has in turn significantly accelerated the SST warming in the central equatorial IO. While the trend in the equatorial westerlies has promoted downwelling and thermocline deepening in the eastern equatorial IO, the central equatorial IO warming is attributed to reduced upwelling in response to a weakening trend of the wind-stress curl. The observed trends in Indian monsoon rainfall and the near-equatorial SST warming are shown to be closely related to variations in the meridional gradient of the monsoon zonal winds. An examination of the twentieth century simulations from 22 IPCC AR4 models, suggests that some models capture the recent equatorial IO warming associated with the weakened summer monsoon circulation reasonably well. The individual member models, however, exhibit significant inter-model variations in representing the observed response of the IO and monsoon coupled system. © 2013 Springer-Verlag Berlin Heidelberg. 资助项目: NSF, Peninsula College of Medicine and Dentistry
; PCMD, Peninsula College of Medicine and Dentistry
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54533
Appears in Collections: 过去全球变化的重建
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作者单位: Centre for Climate Change Research, Indian Institute of Tropical Meteorology, Pune, 411008, India; Atmospheric Sciences, University of Washington, Seattle, WA, 98195, United States
Recommended Citation:
Swapna P.,Krishnan R.,Wallace J.M.. Indian Ocean and monsoon coupled interactions in a warming environment[J]. Climate Dynamics,2014-01-01,42(2017-09-10)