Drivers and mechanisms of ocean deoxygenation

Oschlies, Andreas, Brandt, Peter, Stramma, Lothar and Schmidtko, Sunke (2018) Drivers and mechanisms of ocean deoxygenation Nature Geoscience . DOI 10.1038/s41561-018-0152-2.

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Abstract

Direct observations indicate that the global ocean oxygen inventory is decreasing. Climate models consistently confirm this decline and predict continuing and accelerating ocean deoxygenation. However, current models (1) do not reproduce observed patterns for oxygen changes in the ocean’s thermocline; (2) underestimate the temporal variability of oxygen concentrations and air–sea fluxes inferred from time-series observations; and (3) generally simulate only about half the oceanic oxygen loss inferred from observations. We here review current knowledge about the mechanisms and drivers of oxygen changes and their variation with region and depth over the world’s oceans. Warming is considered a major driver: in part directly, via solubility effects, and in part indirectly, via changes in circulation, mixing and oxygen respiration. While solubility effects have been quantified and found to dominate deoxygenation near the surface, a quantitative understanding of contributions from other mechanisms is still lacking. Current models may underestimate deoxygenation because of unresolved transport processes, unaccounted for variations in respiratory oxygen demand, or missing biogeochemical feedbacks. Dedicated observational programmes are required to better constrain biological and physical processes and their representation in models to improve our understanding and predictions of patterns and intensity of future oxygen change.

Document Type: Article
Research affiliation: OceanRep > SFB 754 > A5
OceanRep > SFB 754 > A2
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BM Biogeochemical Modeling
OceanRep > SFB 754 > A4
OceanRep > SFB 754 > B1
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-PO Physical Oceanography
OceanRep > SFB 754
Refereed: Yes
DOI etc.: 10.1038/s41561-018-0152-2
ISSN: 1752-0894
Projects: SFB754, GO2NE
Date Deposited: 27 Jun 2018 10:41
Last Modified: 27 Jun 2018 10:57
URI: http://eprints.uni-kiel.de/id/eprint/43511

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