DOI: 10.1007/s00382-013-2024-1
Scopus记录号: 2-s2.0-84891379239
论文题名: On the anomalous precipitation enhancement over the Himalayan foothills during monsoon breaks
作者: Vellore R.K. ; Krishnan R. ; Pendharkar J. ; Choudhury A.D. ; Sabin T.P.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2014
卷: 43, 期: 2017-07-08 起始页码: 2009
结束页码: 2031
语种: 英语
英文关键词: Flood-producing precipitation
; Himalayan foothills
; Monsoon-breaks
; Westerly trough
英文摘要: An intriguing feature associated with ‘breaks’ in the Indian summer monsoon is the occurrence of intense/flood-producing precipitation confined to central-eastern parts of the Himalayan (CEH) foothills and north-eastern parts of India. Past studies have documented various large-scale circulation aspects associated with monsoon-breaks, however the dynamical mechanisms responsible for anomalous precipitation enhancement over CEH foothills remain unclear. This problem is investigated using diagnostic analyses of observed and reanalysis products and high-resolution model simulations. The present findings show that the anomalous precipitation enhancement over the CEH foothills during monsoon-breaks emerges as a consequence of interactions between southward intruding mid-latitude westerly troughs and the South Asian monsoon circulation in its weak phase. These interactions facilitate intensification of mid-tropospheric cyclonic vorticity and strong ascending motion over the CEH foothills, so as to promote deep convection and concentrated rainfall activity over the region during monsoon-breaks. Mesoscale orographic effects additionally tend to amplify the vertical motions and precipitation over the CEH foothills as evidenced from the high-resolution model simulations. It is further noted from the model simulations that the coupling between precipitation and circulation during monsoon-breaks can produce nearly a threefold increase of total precipitation over the CEH foothills and neighborhood as opposed to active-monsoon conditions. © 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/54486
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
Recommended Citation:
Vellore R.K.,Krishnan R.,Pendharkar J.,et al. On the anomalous precipitation enhancement over the Himalayan foothills during monsoon breaks[J]. Climate Dynamics,2014-01-01,43(2017-07-08)