Ocean (De)oxygenation Across the Last Deglaciation

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Author(s) Jaccard, S.L., Galbraith, Eric D., Frölicher, Thomas L., Gruber, Nicolas
Publication Type Journal Items, Publication Status: Published
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Title Ocean (De)oxygenation Across the Last Deglaciation
Subtitle Insights for the future
Author(s) Jaccard, S.L.
Galbraith, Eric D.
Frölicher, Thomas L.
Gruber, Nicolas
Journal or Series Title Oceanography
Volume Number 27
Issue Number 1
Start Page 26
End Page 35
ISSN 1042-8275
Publisher The Oceanography Society
Publication Place Washington, DC
Publication Date 2014-03-01
Abstract Anthropogenic warming is expected to drive oxygen out of the ocean as the water temperature rises and the rate of exchange between subsurface waters and the atmosphere slows due to enhanced upper ocean density stratification. Observations from recent decades are tantalizingly consistent with this prediction, though these changes remain subtle in the face of natural variability. Earth system model projections unanimously predict a long-term decrease in the global ocean oxygen inventory, but show regional discrepancies, particularly in the most oxygen-depleted waters, owing to the complex interplay between oxygen supply pathways and oxygen consumption. The geological record provides an orthogonal perspective, showing how the oceanic oxygen content varied in response to prior episodes of climate change. These past changes were much slower than the current, anthropogenic change, but can help to appraise sensitivities, and point toward potentially dominant mechanisms of change. Consistent with the model projections, marine sediments recorded an overall expansion of low-oxygen waters in the upper ocean as it warmed at the end of the last ice age. This expansion was not linearly related with temperature, though, but reached a deoxygenation extreme midway through the warming. Meanwhile, the deep ocean became better oxygenated, opposite the general expectation. These observations require that significant changes in apparent oxygen utilization occurred, suggesting that they will also be important in the future.
DOI 10.5670/oceanog.2014.05
Document Type Article
Publication Status Published
Language English
Assigned Organisational Unit(s) 03731
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NEBIS System Number 000552953
Source Database ID SCOPUS-84894077387
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  author = "Jaccard, S.L. and Galbraith, Eric D. and Fr{\"{o}}licher, Thomas L. and Gruber, Nicolas",
  title = "{O}cean ({D}e)oxygenation {A}cross the {L}ast {D}eglaciation: {I}nsights for the future",
  journal = "Oceanography",
  year = 2014,
  volume = "27",
  number = "1",
  pages = "26--35",
  month = mar,

E-Citations record created: Tue, 04 Mar 2014, 07:42:20 CET