DOI: 10.1007/s00382-012-1650-3
Scopus记录号: 2-s2.0-84884701055
论文题名: Wind-driven changes in Southern Ocean residual circulation, ocean carbon reservoirs and atmospheric CO2
作者: Lauderdale J.M. ; Garabato A.C.N. ; Oliver K.I.C. ; Follows M.J. ; Williams R.G.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2013
卷: 41, 期: 2017-07-08 起始页码: 2145
结束页码: 2164
语种: 英语
英文关键词: Atmospheric carbon dioxide
; Carbon Partitioning
; Southern Hemisphere westerly winds
; Southern Ocean residual circulation
英文摘要: The effect of idealized wind-driven circulation changes in the Southern Ocean on atmospheric CO2 and the ocean carbon inventory is investigated using a suite of coarse-resolution, global coupled ocean circulation and biogeochemistry experiments with parameterized eddy activity and only modest changes in surface buoyancy forcing, each experiment integrated for 5,000 years. A positive correlation is obtained between the meridional overturning or residual circulation in the Southern Ocean and atmospheric CO2: stronger or northward-shifted westerly winds in the Southern Hemisphere result in increased residual circulation, greater upwelling of carbon-rich deep waters and oceanic outgassing, which increases atmospheric pCO2 by ∼20 μatm; weaker or southward-shifted winds lead to the opposing result. The ocean carbon inventory in our model varies through contrasting changes in the saturated, disequilibrium and biogenic (soft-tissue and carbonate) reservoirs, each varying by O(10-100) PgC, all of which contribute to the net anomaly in atmospheric CO2. Increased residual overturning deepens the global pycnocline, warming the upper ocean and decreasing the saturated carbon reservoir. Increased upwelling of carbon- and nutrient-rich deep waters and inefficient biological activity results in subduction of unutilized nutrients into the ocean interior, decreasing the biogenic carbon reservoir of intermediate and mode waters ventilating the Northern Hemisphere, and making the disequilibrium carbon reservoir more positive in the mode waters due to the reduced residence time at the surface. Wind-induced changes in the model carbon inventory are dominated by the response of the global pycnocline, although there is an additional abyssal response when the peak westerly winds change their latitude, altering their proximity to Drake Passage and changing the depth extent of the southward return flow of the overturning: a northward shift of the westerly winds isolates dense isopycnals, allowing biogenic carbon to accumulate in the deep ocean of the Southern Hemisphere, while a southward shift shoals dense isopycnals that outcrop in the Southern Ocean and reduces the biogenic carbon store in the deep ocean. © 2013 Springer-Verlag Berlin Heidelberg. 资助项目: NERC, Natural Environment Research Council
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54776
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Earth, Ocean and Ecological Sciences, School of Environmental Science, University of Liverpool, 4 Brownlow Street, Liverpool, L69 3GP, United Kingdom; Ocean and Earth Science, National Oceanography Centre, Southampton, University of Southampton Waterfront Campus, European Way, Southampton, SO14 3ZH, United Kingdom; Department of Earth, Atmosphere and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, United States
Recommended Citation:
Lauderdale J.M.,Garabato A.C.N.,Oliver K.I.C.,et al. Wind-driven changes in Southern Ocean residual circulation, ocean carbon reservoirs and atmospheric CO2[J]. Climate Dynamics,2013-01-01,41(2017-07-08)