DOI: 10.1002/joc.5390
论文题名: The role of monsoon low-level jet in modulating heavy rainfall events
作者: Xavier A. ; Kottayil A. ; Mohanakumar K. ; Xavier P.K.
刊名: International Journal of Climatology
ISSN: 8998418
出版年: 2018
卷: 38 起始页码: e569
结束页码: e576
语种: 英语
英文关键词: extreme rainfall
; low-level jet
; moisture flux
; monsoon
Scopus关键词: Atmospheric thermodynamics
; Fighter aircraft
; Moisture
; Weather forecasting
; Asian summer monsoons
; European centre for medium-range weather forecasts
; Extreme rainfall
; Large-scale distribution
; Low level jet
; Moisture fluxes
; monsoon
; South western coast of india
; Rain
; advection
; atmospheric circulation
; atmospheric convection
; atmospheric moisture
; extreme event
; jet flow
; monsoon
; rainfall
; summer
; India
英文摘要: Monsoon low-level jet (MLLJ) is an important component of Asian summer monsoon circulation, which is responsible for large-scale distribution and variability of rainfall over the Indian subcontinent. The evolution of MLLJ characteristics prior to heavy rainfall days and its changes which lead to instances of heavy rainfall over the south-western coast of India are studied. The European Centre for Medium Range Weather Forecasts (ECMWF) re-analysis data and India Meteorological Department (IMD) rainfall data during 1979–2007 were used for this study. It is found that the MLLJ core speed, westerly wind depth, zonal water vapour flux, horizontal wind shear and cyclonic vorticity show a steady increase towards the day of heavy rainfall and gradually decrease thereafter. The intensification of these parameters not only brings in abundant moisture but also triggers convection, thereby resulting in the formation of heavy rainfall during monsoon season. The large-scale advection of moisture brought about by strengthening of MLLJ is shown to be a prerequisite for heavy rainfall over the Indian subcontinent. An interesting result of this study is that heavy rainfall days may have some predictability by continuous monitoring of the progression of MLLJ. © 2017 Royal Meteorological Society Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/116913
Appears in Collections: 气候减缓与适应
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作者单位: Department of Atmospheric Sciences, Cochin University of Science and Technology, Cochin, India; Advanced Centre for Atmospheric Radar Research, Cochin University of Science and Technology, Cochin, India; Met Office Hadley Centre, Exeter, United Kingdom
Recommended Citation:
Xavier A.,Kottayil A.,Mohanakumar K.,et al. The role of monsoon low-level jet in modulating heavy rainfall events[J]. International Journal of Climatology,2018-01-01,38