DOI: 10.1038/ngeo2538
论文题名: Southern Ocean buoyancy forcing of ocean ventilation and glacial atmospheric CO2
作者: Watson A.J. ; Vallis G.K. ; Nikurashin M.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2015
卷: 8, 期: 11 起始页码: 861
结束页码: 864
语种: 英语
Scopus关键词: atmospheric gas
; buoyancy
; carbon dioxide
; carbon sequestration
; circulation modeling
; concentration (composition)
; deep sea
; eddy
; glacial environment
; upwelling
; Southern Ocean
英文摘要: Atmospheric CO2 concentrations over glacial-interglacial cycles closely correspond to Antarctic temperature patterns. These are distinct from temperature variations in the mid to northern latitudes, so this suggests that the Southern Ocean is pivotal in controlling natural CO2 concentrations. Here we assess the sensitivity of atmospheric CO2 concentrations to glacial-interglacial changes in the ocean's meridional overturning circulation using a circulation model for upwelling and eddy transport in the Southern Ocean coupled with a simple biogeochemical description. Under glacial conditions, a broader region of surface buoyancy loss results in upwelling farther to the north, relative to interglacials. The northern location of upwelling results in reduced CO2 outgassing and stronger carbon sequestration in the deep ocean: we calculate that the shift to this glacial-style circulation can draw down 30 to 60ppm of atmospheric CO2. We therefore suggest that the direct effect of temperatures on Southern Ocean buoyancy forcing, and hence the residual overturning circulation, explains much of the strong correlation between Antarctic temperature variations and atmospheric CO2 concentrations over glacial-interglacial cycles. © 2015 Macmillan Publishers Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106141
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: College of Life and Environmental Sciences, University of Exeter, North Park Road, Exeter, United Kingdom; College of Engineering, Mathematics and Physics, University of Exeter, North Park Road, Exeter, United Kingdom; Institute for Marine and Antarctic Studies, University of Tasmania, Private Bag 129, Hobart, TAS, Australia; ARC Centre of Excellence for Climate System Science, Sydney, NSW, Australia
Recommended Citation:
Watson A.J.,Vallis G.K.,Nikurashin M.. Southern Ocean buoyancy forcing of ocean ventilation and glacial atmospheric CO2[J]. Nature Geoscience,2015-01-01,8(11)