DOI: 10.1007/s00382-014-2403-2
Scopus记录号: 2-s2.0-84940725610
论文题名: Rainfall mechanism over the rain-shadow region of north peninsular India
作者: Narkhedkar S.G. ; Morwal S.B. ; Padmakumari B. ; Deshpande C.G. ; Kothawale D.R. ; Maheskumar R.S. ; Kulkarni J.R.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2015
卷: 45, 期: 2017-05-06 起始页码: 1493
结束页码: 1512
语种: 英语
英文关键词: Dynamical processes
; Microphysical processes
; Peninsular India
; Rain-shadow region
; Thermo-dynamical processes
英文摘要: Rainfall mechanism over the rain-shadow region of north peninsular India during the summer monsoon season has been investigated using dynamic, thermodynamic, cloud microphysics and cloud dynamic (CMCD) forcings. Daily rainfall data has been used to understand rainfall variability. Daily ECMWF wind data for the period 2009–2011 have been used to study the wind divergence, shear and vertical velocity profiles. Daily thermodynamic parameters from upper air soundings of Hyderabad (17.448°N, 78.381°E), have been examined. Aircraft data have been used to study CMCD parameters. The divergence is found between surfaces to 850 hPa level whereas the convergence is at 850 hPa, which comes down to surface level during presence of low pressure systems. The divergence is observed at low (700 hPa), mid (600–300 hPa) and upper (250–150 hPa) tropospheric levels. In consequence of these divergence structures, three types of cloud systems viz. shallow, congestus and deep are developed with bases just above 850 hPa and tops at corresponding three divergent levels. The vertical profiles of relative humidity observed by radiosonde data have been analyzed to get the frequency distribution of shallow, congestus and deep clouds. The highest frequency observed is that of congestus clouds. The thermodynamic structure shows dry surface level and warm and moist middle troposphere with tongues of dry air and multilevel inversions which have been attributed to advection of aerosol-rich dry air. The aircraft observations showed high aerosol concentrations from surface to 5 km, polluted clouds with cloud droplet effective radius smaller than that required for collision–coalescence process. The factors which are responsible for causing low rainfall over the rain-shadow area have been identified. © 2014, Springer-Verlag Berlin Heidelberg. 资助项目: MoES, Ministry of Earth Sciences
; NOAA, National Oceanic and Atmospheric Administration
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54024
Appears in Collections: 过去全球变化的重建
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作者单位: Indian Institute of Tropical Meteorology, Pune, India
Recommended Citation:
Narkhedkar S.G.,Morwal S.B.,Padmakumari B.,et al. Rainfall mechanism over the rain-shadow region of north peninsular India[J]. Climate Dynamics,2015-01-01,45(2017-05-06)