DOI: 10.1007/s00382-012-1620-9
Scopus记录号: 2-s2.0-84884701305
论文题名: East Asian summer monsoon circulation structure controlled by feedback of condensational heating
作者: Jin Q. ; Yang X.-Q. ; Sun X.-G. ; Fang J.-B.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2013
卷: 41, 期: 2017-07-08 起始页码: 1885
结束页码: 1897
语种: 英语
英文关键词: Condensational heating
; East Asian summer monsoon
; Feedback
; Structure
英文摘要: The East Asian summer monsoon (EASM) features strong humid low-level southerly flows and abundant rainfall over the subtropical East Asia. This study identified how condensational heating generated by the EASM rainfall can affect the EASM circulation by contrasting two 10-member ensembles of atmospheric General Circulation Model experiments with Community Climate Model version 3/National Center for Atmospheric Research respectively with and without feedback of condensational heating over the East Asian domain. Major results inferred from the experiments are as follows. Condensational heating is found to absolutely dominate diabatic heating over East Asia. Exclusion of the feedback of condensational heating leads to a significant weakening of summertime tropospheric warming over land and thus a large reduction of the land-sea thermal contrast between entire Asian continent and surrounding oceans. Associated with this, the lower-level EASM flows are weakened, South Asian High at 200 hPa migrates southward with reduced intensity and breaks over East Asia with southerly flows prevailing in the upper troposphere, in contrast to northerly flows in reality. Consequently, local EASM meridional cell disappears and the baroclinic structure featured by the EASM circulation that is dynamically determined by convective condensational heating over East Asia is altered to a barotropic structure. Therefore, it is concluded that the feedback of condensational heating acts to largely enhance lower-level flows of the EASM and essentially determine its baroclinic structure and meridional cell, once the solar radiation and inhomogeneity of the Earth's surface form low-level monsoon flows in East Asia by enhancing land-sea thermal contrast. © 2012 Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54763
Appears in Collections: 过去全球变化的重建
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作者单位: Institute for Climate and Global Change Research, School of Atmospheric Sciences, Nanjing University, Nanjing, 210093, China
Recommended Citation:
Jin Q.,Yang X.-Q.,Sun X.-G.,et al. East Asian summer monsoon circulation structure controlled by feedback of condensational heating[J]. Climate Dynamics,2013-01-01,41(2017-07-08)