DOI: 10.1007/s00382-014-2257-7
Scopus记录号: 2-s2.0-84929708643
论文题名: Global warming and the weakening of the Asian summer monsoon circulation: assessments from the CMIP5 models
作者: Sooraj K.P. ; Terray P. ; Mujumdar M.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2015
卷: 45, 期: 2017-01-02 起始页码: 233
结束页码: 252
语种: 英语
英文关键词: Asian summer monsoon
; Atmospheric stability
; Meridional gradient in deep tropospheric heating
; Thermodynamic and dynamic components
英文摘要: The evolution of the Asian summer monsoon (ASM) in a global warming environment is a serious scientific and socio-economic concern since many recent studies have demonstrated the weakening nature of large-scale tropical circulation under anthropogenic forcing. But, how such processes affect the ASM circulation and rainfall is still a matter of debate. This study examines the climate model projections from a selected set of Coupled Model Inter-comparison Project 5 (CMIP5) models to provide a unified perspective on the future ASM response. The results indicate a robust reduction in the large-scale meridional gradient of temperature (MGT) at upper levels (200 hPa) over the ASM region, associated with enhanced ascendance and deep tropospheric heating over the equatorial Pacific in the future climate. The differential heating in the upper troposphere, with concomitant increase (decrease) in atmospheric stability (MGT), weakens the ASM circulation, promotes a northward shift of the monsoon circulation and a widening of the local Hadley cell in the eastern Indian sector. An examination of the water vapour budget indicates the competing effects of the thermodynamic (moisture convergence) and dynamics processes (monsoon circulation) on future ASM rainfall changes. The former component wins out over the later one and leads to the intensification of Indian monsoon rainfall in the CMIP5 projections. However, the diagnostics further show a considerable offset due to the dynamic component. © 2014, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54093
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, India; LOCEAN Laboratory, Sorbonne Universites (UPMC, Univ Paris 06)-CNRS-IRD-MNHN, 4 Place Jussieu, Paris, France; Indo-French Cell for Water Sciences, IISc-IITM-NIO–IRD Joint International Laboratory, Indian Institute of Tropical Meteorology, Pune, India
Recommended Citation:
Sooraj K.P.,Terray P.,Mujumdar M.. Global warming and the weakening of the Asian summer monsoon circulation: assessments from the CMIP5 models[J]. Climate Dynamics,2015-01-01,45(2017-01-02)