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Sensitivity of simulated extent and future evolution of marine suboxia to mixing intensity
| Content Provider | Semantic Scholar |
|---|---|
| Author | Duteil, Olaf Oschlies, Andreas |
| Copyright Year | 2011 |
| Abstract | [1] Geological and hydrographic records contain evidence of substantial past variations in the oxygenation of the global ocean. Numerical models predicts a future decrease of marine oxygen levels under global warming. Using a global biogeochemical‐climate model in which diapycnal mixing is parametrised as the sum of the regionally heterogenous tidal and homogenous background vertical mixing, we here show that simulated total oceanic oxygen content and the extent of marine suboxia are both sensitive to the strength of background vertical mixing. Eight otherwise identical configurations of the model were spun up under pre‐industrial conditions for different vertical diffusivities ranging from background values of 0.01 cm/s to 0 .5 cm/s . Thi s range cor responds to var ious observational estimates and to values currently used in numerical ocean circulation models. Whereas the simulated total oceanic oxygen content is larger for larger mixing intensities, the simulated suboxic volume displays a maximum at intermediate diffusivities of about 0.2 cm/s. The intensity of vertical mixing also determines the evolution of suboxic areas under projected 21st century CO2 emissions: while all model configurations predict a decline in total oceanic oxygen, the simulated extent of marine suboxia shows a 21st century expansion only for mixing rates higher than 0.2 cm/s, whereas the suboxic volume declines for lower mixing rates despite an overall loss of marine oxygen. Differences in the poorly constrained mixing parameterisation can thus lead to qualitatively different estimates about the future evolution of marine suboxia under projected climate change. Citation: Duteil, O., and A. Oschlies (2011), Sensitivity of simulated extent and future evolution of marine suboxia to mixing intensity,Geophys. Res. Lett., 38, L06607, doi:10.1029/2011GL046877. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://eprints.uni-kiel.de/11822/1/Duteil_OschliesGRL11.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Arabic numeral 0 Carbon Dioxide Cell Respiration Centimeter per Second Cordycepin Description Emission - Male genitalia finding Estimated Global Warming Large List of ocean circulation models Mixing (mathematics) Numerical analysis Oxygen Consumption Oxygen measurement Projections and Predictions Records Simulation Small Water |
| Content Type | Text |
| Resource Type | Article |
