DOI: 10.1175/JCLI-D-17-0002.1
Scopus记录号: 2-s2.0-85047095440
论文题名: Numerical study of physical processes controlling summer precipitation over the Western Ghats Region
作者: Zhang G. ; Smith R.B.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 8 起始页码: 3099
结束页码: 3115
语种: 英语
英文关键词: Cloud resolving models
; Complex terrain
; Convection
; Orographic effects
; Rainfall
; Sea surface temperature
Scopus关键词: Atmospheric temperature
; Atmospheric thermodynamics
; Heat convection
; Heat flux
; Landforms
; Oceanography
; Potential energy
; Process control
; Rain gages
; Submarine geophysics
; Surface properties
; Surface waters
; Weather forecasting
; Cloud resolving model
; Complex terrains
; Convective available potential energies
; Mixed phase microphysics
; Orographic effects
; Sea surface temperature (SST)
; Sensitivity Simulation
; Weather research and forecasting models
; Rain
; atmospheric convection
; atmospheric modeling
; cloud cover
; complex terrain
; numerical method
; orographic effect
; precipitation (climatology)
; rainfall
; sea surface temperature
; Arabian Sea
; India
; Indian Ocean
; Western Ghats
英文摘要: Summer precipitation over the Western Ghats and its adjacent Arabian Sea is an important component of the Indian monsoon. To advance understanding of the physical processes controlling this regional precipitation, a series of high-resolution convection-permitting simulations were conducted using the Weather Research and Forecasting (WRF) Model. Convection simulated in the WRF Model agrees with TRMM and MODIS satellite estimates. Sensitivity simulations are conducted, by altering topography, latent heating, and sea surface temperature (SST), to quantify the effects of different physical forcing factors. It is helpful to put India's west coast rainfall systems into three categories with different causes and characteristics. 1) Offshore rainfall is controlled by incoming convective available potential energy (CAPE), the entrainment of midtropospheric dry layer in the monsoon westerlies, and the latent heat flux and SST of the Arabian Sea. It is not triggered by the Western Ghats. When offshore convection is present, it reduces both CAPE and the downwind coastal rainfall. Strong (weak) offshore rainfall is associated with high (low) SSTs in the Arabian Sea, suggested by both observations and sensitivity simulations. 2) Coastal convective rainfall is forced by the coastline roughness, diurnal heating, and the Western Ghats topography. This localized convective rainfall ends abruptly beyond the Western Ghats, producing a rain shadow to the east of the mountains. This deep convection with mixed phase microphysics is the biggest overall rain producer. 3) Orographic stratiform warm rain and drizzle dominate the local precipitation on the crest of the Western Ghats. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111581
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geology and Geophysics, Yale University, New Haven, CT, United States
Recommended Citation:
Zhang G.,Smith R.B.. Numerical study of physical processes controlling summer precipitation over the Western Ghats Region[J]. Journal of Climate,2018-01-01,31(8)