DOI: 10.1175/JCLI-D-17-0451.1
Scopus记录号: 2-s2.0-85050185538
论文题名: The impact of tropical precipitation on summertime euro-Atlantic circulation via a circumglobal wave train
作者: O'Reilly C.H. ; Woollings T. ; Zanna L. ; Weisheimer A.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 16 起始页码: 6481
结束页码: 6504
语种: 英语
英文关键词: Atmosphere-ocean interaction
; Atmospheric circulation
; Diabatic heating
; Rainfall
; Rossby waves
; Teleconnections
Scopus关键词: Atmospheric pressure
; Atmospheric thermodynamics
; Climate change
; Fighter aircraft
; Mechanical waves
; Ocean currents
; Precipitation (meteorology)
; Rain
; Atmosphere-ocean interactions
; Atmospheric circulation
; Diabatic heating
; Rossby wave
; Teleconnections
; Tropics
; air-sea interaction
; atmospheric circulation
; diabatic process
; El Nino-Southern Oscillation
; heating
; rainfall
; Rossby wave
; summer
; teleconnection
; tropical environment
; Atlantic Ocean
; Atlantic Ocean (North)
; Pacific Ocean
; Pacific Ocean (Tropical)
英文摘要: The influence of tropical precipitation variability on summertime seasonal circulation anomalies in the Euro-Atlantic sector is investigated. The dominant mode of the maximum covariance analysis (MCA) between the Euro-Atlantic circulation and tropical precipitation reveals a cyclonic anomaly over the extratropical North Atlantic, contributing to anomalously wet conditions over western Europe and dry conditions over eastern Europe and Scandinavia (in the positive phase). The related mode of tropical precipitation variability is associated with tropical Pacific SST anomalies and is closely linked to the El Niño-Southern Oscillation (ENSO). The second MCA mode consists of weaker tropical precipitation anomalies but with a stronger extratropical signal that reflects internal atmospheric variability. The teleconnection mechanism is tested in barotropic model simulations, which indicate that the observed link between the dominant mode of tropical precipitation and the Euro-Atlantic circulation anomalies is largely consistent with linear Rossby wave dynamics. The barotropic model response consists of a circumglobal wave train in the extratropics that is primarily forced by divergence anomalies in the eastern tropical Pacific. Both the eastward and westward group propagation of the Rossby waves are found to be important in determining the circulation response over the Euro-Atlantic sector. The mechanism was also analyzed in an operational seasonal forecasting system, ECMWF's System 4. While System 4 is well able to reproduce and skillfully forecast the tropical precipitation, the extratropical circulation response is absent over the Euro-Atlantic region, which is likely related to biases in the Asian jet stream. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111424
Appears in Collections: 气候减缓与适应
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作者单位: Atmospheric, Oceanic and Planetary Physics, Department of Physics, University of Oxford, Oxford, United Kingdom; European Centre for Medium-Range Weather Forecasts, University of Oxford, Oxford, United Kingdom; National Centre for Atmospheric Science, Department of Physics, University of Oxford, Oxford, United Kingdom
Recommended Citation:
O'Reilly C.H.,Woollings T.,Zanna L.,et al. The impact of tropical precipitation on summertime euro-Atlantic circulation via a circumglobal wave train[J]. Journal of Climate,2018-01-01,31(16)