Variations in Ocean Deoxygenation Across Earth System Models: Isolating the Role of Parameterized Lateral Mixing

Bahl, A.; Gnanadesikan, A.; Pradal, M.‐A.

doi:10.1029/2018gb006121

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Variations in Ocean Deoxygenation Across Earth System Models: Isolating the Role of Parameterized Lateral Mixing

2019
By Bahl, A. ; Gnanadesikan, A. ; Pradal, M.‐A.
Source: Global Biogeochemical Cycles, 33(6), 703-724

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Journal Title:

Global Biogeochemical Cycles
Personal Author:

Bahl, A. ; Gnanadesikan, A. ; Pradal, M.‐A.

Bahl, A. ; Gnanadesikan, A. ; Pradal, M.‐A. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research)
Description:

Modern Earth system models (ESMs) disagree on the impacts of anthropogenic global warming on the distribution of oxygen and associated low‐oxygen waters. A sensitivity study using the GFDL CM2Mc model points to the representation of lateral mesoscale eddy transport as a potentially important factor in such disagreement. Because mesoscale eddies are smaller than the spatial scale of ESM ocean grids, their impact must be parameterized using a lateral mixing coefficient AREDI. The value of AREDI varies across modern ESMs and nonlinearly impacts oxygen distributions. This study shows that an increase in atmospheric CO2 results in a decline in productivity and a decrease in ventilation age in the tropics, increasing oxygen concentrations in the upper thermocline. In high latitudes global warming causes shallowing of deep convection, reducing the supply of oxygen to the deep. The net impact of these processes depends on AREDI, with an increase in hypoxic volume yet smaller total deoxygenation in the low‐mixing models, but a decrease in hypoxic volume yet larger total deoxygenation in the high‐mixing models. All models show decreases in suboxic volume, which are largest in the low‐mixing models. A subset of Coupled Model Intercomparison Project Phase 5 models exhibits a similar range of responses to global warming and similar decoupling between total deoxygenation and change in hypoxic volume. Uncertainty in lateral mixing remains an important contributor to uncertainty in projecting ocean deoxygenation.
Keywords:

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Atmospheric Science Environmental Chemistry General Environmental Science Global And Planetary Change
Source:

Global Biogeochemical Cycles, 33(6), 703-724
DOI:

https://doi.org/10.1029/2018gb006121
ISSN:

0886-6236;1944-9224;
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PDF
Publisher:

American Geophysical Union (AGU)
Document Type:

Journal Article
Funding:

Grant no. NA15OAR4310172 ; Grant no. NA16OAR4310174

Grant no. NA15OAR4310172 ; Grant no. NA16OAR4310174 Less -
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urn:sha256:516e0caaad67c458712dbee4697e88b19cf0aafb6e96c7b1764ec25e056dbbfe
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https://repository.library.noaa.gov/view/noaa/59623/noaa_59623_DS1.pdf
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