DOI: 10.1175/JCLI_D_13_00615.1
Scopus记录号: 2-s2.0-84903398792
论文题名: Tropical connections to climatic change in the extratropical Southern Hemisphere: The role of atlantic SST trends
作者: Simpkins G.R. ; McGregor S. ; Taschetto A.S. ; Ciasto L.M. ; England M.H.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 13 起始页码: 4923
结束页码: 4936
语种: 英语
Scopus关键词: Climate models
; Climatology
; Mechanical waves
; Atmosphere-ocean interactions
; Atmospheric circulation
; Atmospheric circulation changes
; Atmospheric general circulation models
; Climate variability
; Geo-potential heights
; Sea surface temperature (SST)
; Teleconnections
; Oceanography
; air-sea interaction
; atmospheric forcing
; atmospheric general circulation model
; climate change
; extratropical environment
; Rossby wave
; sea surface temperature
; Southern Hemisphere
; teleconnection
英文摘要: The austral spring relationships between sea surface temperature (SST) trends and the Southern Hemisphere (SH) extratropical atmospheric circulation are investigated using an atmospheric general circulation model (AGCM). A suite of simulations are analyzed wherein the AGCM is forced by underlying SST conditions in which recent trends are constrained to individual ocean basins (Pacific, Indian, and Atlantic), allowing the impact of each region to be assessed in isolation. When forced with observed global SST, the model broadly replicates the spatial pattern of extratropical SHgeopotential height trends seen in reanalyses. However, when forcing by each ocean basin separately, similar structures arise only when Atlantic SST trends are included. It is further shown that teleconnections from the Atlantic are associated with perturbations to the zonal Walker circulation and the corresponding intensification of the local Hadley cell, the impact of which results in the development of atmospheric Rossby waves. Thus, increased Rossby waves, forced by positive Atlantic SST trends, may have played a role in driving geopotential height trends in the SH extratropics. Furthermore, these atmospheric circulation changes promote warming throughout the Antarctic Peninsula and much of West Antarctica, with a pattern that closely matches recent observational records. This suggests that Atlantic SST trends, via a teleconnection to the SH extratropics, may have contributed to springtime climatic change in the SH extratropics over the past three decades. © 2014 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51358
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; Australian Research Council Centre of Excellence for Climate System Science, University of New South Wales, Sydney NSW, Australia; Geophysical Institute, Bjerknes Centre for Climate Research, University of Bergen, Bergen, Norway
Recommended Citation:
Simpkins G.R.,McGregor S.,Taschetto A.S.,et al. Tropical connections to climatic change in the extratropical Southern Hemisphere: The role of atlantic SST trends[J]. Journal of Climate,2014-01-01,27(13)