DOI: 10.1002/2017JD027222
Scopus记录号: 2-s2.0-85041061177
论文题名: On the Dynamics of Austral Heat Waves
作者: Risbey J.S. ; O'Kane T.J. ; Monselesan D.P. ; Franzke C.L.E. ; Horenko I.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 1 起始页码: 38
结束页码: 57
语种: 英语
英文关键词: blocking
; circulation
; heat wave
; waveguide
Scopus关键词: atmospheric blocking
; circulation
; convergence
; geopotential
; heat wave
; height
; jet
; Southern Hemisphere
; summer
; vector
; wave action
; Australia
; Indian Ocean
; Pacific Ocean
; South America
英文摘要: This work examines summer heat wave events in four different regions of Australia (southwest, central, southeast, and northeast) to assess similarities and differences in the circulations that precede, accompany, and follow the heat wave events. A series of circulation composites are constructed for days from 10 days prior to 5 days following onset of each heat wave event. The composites of geopotential height anomalies and wave activity flux vectors show that heat waves in southwest and southeast Australia are preceded by coherent wave train structures in the Indian Ocean region, accompanied by blocking in the Australian region (as an amplified node of the wave train structure), and followed by coherent responses of wave train patterns in the Pacific and South America regions. The heat wave blocking high is maintained by convergence of wave activity in a well-defined wave channel. The concentration of wave activity in the block is aided by the formation of a subtropical jet branch and wave barrier on the equatorward side of the block. Heat waves in central and northeast Australia show similar wave train life cycle responses, but with a proximate ridge in the midtroposphere and a trough in the nearby waveguide region. Heat waves in Australia can be viewed as an element of successive expression of the planetary waveguide modes in the Southern Hemisphere and serve as signifiers of organized, active phases of these modes. ©2017. Commonwealth of Australia. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114706
Appears in Collections: 气候减缓与适应
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作者单位: CSIRO Oceans and Atmosphere, Hobart, TAS, Australia; Universität Hamburg, Hamburg, Germany; Università della Svizzera Italiana, Lugano, Switzerland
Recommended Citation:
Risbey J.S.,O'Kane T.J.,Monselesan D.P.,et al. On the Dynamics of Austral Heat Waves[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(1)