DOI: 10.1175/JCLI-D-14-00438.1
Scopus记录号: 2-s2.0-84920286613
论文题名: Teleconnections between tropical Pacific SST anomalies and extratropical Southern Hemisphere climate
作者: Ciasto L.M. ; Simpkins G.R. ; England M.H.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期: 1 起始页码: 56
结束页码: 65
语种: 英语
Scopus关键词: Atmospheric temperature
; Atmospheric thermodynamics
; Climate change
; Climatology
; Glaciers
; Ice
; Mechanical waves
; Meteorology
; Sea ice
; Surface waters
; Tropics
; Annular mode
; Atmosphere-ocean interactions
; Climate variability
; Teleconnections
; Tropical variability
; Oceanography
; air temperature
; air-sea interaction
; atmospheric circulation
; climate variation
; extratropical environment
; Rossby wave
; sea ice
; sea surface temperature
; Southern Hemisphere
; teleconnection
; temperature anomaly
; temperature profile
; Pacific Ocean
; Pacific Ocean (Tropical)
英文摘要: Teleconnections from tropical Pacific sea surface temperature (SST) anomalies to the high-latitude Southern Hemisphere (SH) are examined using observations and reanalysis. Analysis of tropical Pacific SST anomalies is conducted separately for the central Pacific (CP) and eastern Pacific (EP) regions. During the austral cold season, extratropical SHatmospheric Rossby wave train patterns are observed in association with both EP and CP SST variability. The primary difference between the patterns is the westward displacement of the CP-related atmospheric anomalies, consistent with the westward elongation of CP-related convective SST required for upper-level divergence and Rossby wave generation. Consequently, CP-related patterns of SH SST, Antarctic sea ice, and temperature anomalies also exhibit a westward displacement, but otherwise, the cold season extratropical SH teleconnections are largely similar. During the warm season, however, extratropical SH teleconnections associated with tropical CP and EP SST anomalies differ substantially. EP SST variability is linked to largely zonally symmetric structures in the extratropical atmospheric circulation, which projects onto the southern annular mode (SAM), and is strongly related to the SH temperature and sea ice fields. In contrast, CP SST variability is only weakly related to the SH atmospheric circulation, temperature, or sea ice fields and no longer exhibits any clear association with the SAM. One hypothesized mechanism suggests that the relatively weak CP-related SST anomalies are not able to substantially impact the background flow of the subtropical jet and its subsequent interaction with equatorward-propagating waves associated with variability in the SAM. However, there is currently no widely established mechanism that links tropical Pacific SST anomalies to the SAM. © 2015 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50512
Appears in Collections: 气候变化事实与影响
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作者单位: Climate Change Research Centre, University of New South Wales, Sydney, NSW, Australia; Geophysical Institute, University of Bergen, Bjerknes Centre for Climate Research, Bergen, Norway; Climate Change Research Centre, ARC Centre of Excellence for Climate System Science, University of New South Wales, Sydney, NSW, Australia
Recommended Citation:
Ciasto L.M.,Simpkins G.R.,England M.H.. Teleconnections between tropical Pacific SST anomalies and extratropical Southern Hemisphere climate[J]. Journal of Climate,2015-01-01,28(1)