DOI: 10.1007/s00382-013-1972-9
Scopus记录号: 2-s2.0-84906941396
论文题名: Mechanism of high rainfall over the Indian west coast region during the monsoon season
作者: Maheskumar R.S. ; Narkhedkar S.G. ; Morwal S.B. ; Padmakumari B. ; Kothawale D.R. ; Joshi R.R. ; Deshpande C.G. ; Bhalwankar R.V. ; Kulkarni J.R.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2014
卷: 43, 期: 2017-05-06 起始页码: 1513
结束页码: 1529
语种: 英语
英文关键词: Dynamical processes
; High rainfall
; Microphysical processes
; Thermodynamical processes
; West coast of India
英文摘要: The mechanism responsible for high rainfall over the Indian west coast region has been investigated by studying dynamical, thermodynamical and microphysical processes over the region for the monsoon season of 2009. The European Centre for Medium-Range Weather Forecasts wind and NCEP flux data have been used to study the large scale dynamical parameters. The moist adiabatic and multi-level inversion stratifications are found to exist during the high and low rainfall spells, respectively. In the moist adiabatic stratification regime, shallow and deep convective clouds are found coexisting. The Cloud Aerosol Interaction and Precipitation Enhancement EXperiment aircraft data showed cloud updraft spectrum ranging from 1 to 10 m s-1 having modal speed 1-2.5 m s-1. The low updrafts rates provide sufficient time required for warm rain processes to produce rainfall from shallow clouds. The low cloud liquid water is observed above the freezing level indicating efficient warm rain process. The updrafts at the high spectrum end go above freezing level to generate ice particles produced due to mixed-phase rainfall process from deep convective clouds. With aging, deep convection gets transformed into stratiform type, which has been inferred through the vertical distribution of the large scale omega and heating fields. The stratiform heating, high latent heat flux, strong wind shear in the lower and middle tropospheric levels and low level convergence support the sustenance of convection for longer time to produce high rainfall spell. The advection of warm dry air in the middle tropospheric regions inhibits the convection and produce low rainfall spell. The mechanisms producing these spells have been summarized with the block diagram. © 2013 Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54331
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: Indian Institute of Tropical Meteorology, Pune, 411 008, India
Recommended Citation:
Maheskumar R.S.,Narkhedkar S.G.,Morwal S.B.,et al. Mechanism of high rainfall over the Indian west coast region during the monsoon season[J]. Climate Dynamics,2014-01-01,43(2017-05-06)