DOI: 10.1007/s00382-017-3865-9
Scopus记录号: 2-s2.0-85027962201
论文题名: The role of potential vorticity anomalies in the Somali Jet on Indian Summer Monsoon Intraseasonal Variability
作者: Rai P. ; Joshi M. ; Dimri A.P. ; Turner A.G.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2018
卷: 50, 期: 2018-11-12 起始页码: 4149
结束页码: 4169
语种: 英语
英文关键词: Indian Summer Monsoon (ISM)
; Intraseasonal variability
; Potential vorticity
; Somali Jet
; Wind-stress curl
Scopus关键词: air-sea interaction
; atmosphere-ocean coupling
; atmospheric circulation
; boundary current
; boundary layer
; feedback mechanism
; jet flow
; monsoon
; potential vorticity
; rainfall
; sea surface temperature
; seasonal variation
; summer
; wind stress
; Arabian Sea
; Indian Ocean
英文摘要: The climate of the Indian subcontinent is dominated by rainfall arising from the Indian summer monsoon (ISM) during June to September. Intraseasonal variability during the monsoon is characterized by periods of heavy rainfall interspersed by drier periods, known as active and break events respectively. Understanding and predicting such events is of vital importance for forecasting human impacts such as water resources. The Somali Jet is a key regional feature of the monsoon circulation. In the present study, we find that the spatial structure of Somali Jet potential vorticity (PV) anomalies varies considerably during active and break periods. Analysis of these anomalies shows a mechanism whereby sea surface temperature (SST) anomalies propagate north/northwestwards through the Arabian Sea, caused by a positive feedback loop joining anomalies in SST, convection, modification of PV by diabatic heating and mixing in the atmospheric boundary layer, wind-stress curl, and ocean upwelling processes. The feedback mechanism is consistent with observed variability in the coupled ocean–atmosphere system on timescales of approximately 20 days. This research suggests that better understanding and prediction of monsoon intraseasonal variability in the South Asian monsoon may be gained by analysis of the day-to-day dynamical evolution of PV in the Somali Jet. © 2017, Springer-Verlag GmbH Germany. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109294
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, 110067, India; Centre for Ocean and Atmospheric Sciences, University of East Anglia, Norwich, United Kingdom; Climatic Research Unit, University of East Anglia, Norwich, United Kingdom; NCAS-Climate and Department of Meteorology, University of Reading, Reading, United Kingdom
Recommended Citation:
Rai P.,Joshi M.,Dimri A.P.,et al. The role of potential vorticity anomalies in the Somali Jet on Indian Summer Monsoon Intraseasonal Variability[J]. Climate Dynamics,2018-01-01,50(2018-11-12)