DOI: 10.1175/JCLI-D-17-0346.1
Scopus记录号: 2-s2.0-85040553244
论文题名: Northern Hemisphere Rossby Wave initiation events on the extratropical jet-A climatological analysis
作者: Röthlisberger M. ; Martius O. ; Wernli H.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 2 起始页码: 743
结束页码: 760
语种: 英语
英文关键词: Baroclinic flows
; Extratropical cyclones
; Latent heating/cooling
; Potential vorticity
; Rossby waves
; Synoptic climatology
Scopus关键词: Belt conveyors
; Climatology
; Fighter aircraft
; Storms
; Tropical engineering
; Tropics
; Baroclinic flows
; Extratropical cyclones
; Latent heating/cooling
; Potential vorticity
; Rossby wave
; Synoptic climatology
; Mechanical waves
; baroclinic motion
; climatology
; cooling
; cyclone
; extratropical environment
; jet stream
; latent heat flux
; Northern Hemisphere
; potential vorticity
; Rossby wave
; synoptic meteorology
英文摘要: A climatology of Rossby wave initiation (RWI) events on the Northern Hemisphere midlatitude jet is compiled by applying an objective RWI identification algorithm to the ERA-Interim dataset. In winter, RWI events occur most frequently over the northwestern Pacific and less often over the North Atlantic. In summer, the total number of RWI events is lower than in winter and the North Pacific RWI region shifts toward the Tibetan Plateau. Composite analysis of the large-scale flow prior to, during, and after winter North Pacific RWI events shows an upstream wave train propagating across Asia on the Arctic waveguide prior to RWI. The composite wave forms on a relatively weak zonal jet streak, exhibits a baroclinic structure, and is strongly amplified by latent heat release in the warm conveyor belt of a deepening surface cyclone. Moreover, the wave forms in a region of large-scale upper-level deformation, upstream of a preexisting ridge. Further, active tropical convection affects the longitude where RWI occurs and thus acts as a geographical anchor for RWI. Individual RWI events are characterized by preferred combinations of these composite features: a strong surface cyclone tends to occur in concert with strong latent heating and a pronounced positive PV anomaly aloft. A second group of co-occurring features contains active tropical convection, a strengthened subtropical anticyclone, and the downstream ridge. These feature groups might be regarded as idealized archetypal RWI scenarios, although numerous intermediate events exist where features from both groups occur together. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111748
Appears in Collections: 气候减缓与适应
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作者单位: Institute of Geography, University of Bern, Bern, Switzerland; Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland; Mobiliar Laboratory for Natural Risks, University of Bern, Bern, Switzerland; Institute for Atmospheric and Climate Science, ETH Zürich, Zürich, Switzerland
Recommended Citation:
Röthlisberger M.,Martius O.,Wernli H.. Northern Hemisphere Rossby Wave initiation events on the extratropical jet-A climatological analysis[J]. Journal of Climate,2018-01-01,31(2)