Impact of circulation on export production, dissolved organic matter, and dissolved oxygen in the ocean: Results from Phase II of the Ocean Carbon-cycle Model Intercomparison Project (OCMIP-2)

Najjar, R. G.; Jin, X.; Louanchi, F.; Aumont, O.; Caldeira, K.; Doney, S. C.; Dutay, J.-C.; Follows, M.; Gruber, N.; Joos, F.; Lindsay, K.; Maier-Reimer, E.; Matear, R. J.; Matsumoto, K.; Monfray, P.; Mouchet, A.; Orr, J. C.; Plattner, G.-K.; Sarmiento, J. L.; Schlitzer, R.; ... (2007). Impact of circulation on export production, dissolved organic matter, and dissolved oxygen in the ocean: Results from Phase II of the Ocean Carbon-cycle Model Intercomparison Project (OCMIP-2). Global biogeochemical cycles, 21(3), n/a-n/a. Washington, D.C.: American Geophysical Union 10.1029/2006GB002857

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Results are presented of export production, dissolved organic matter (DOM) and dissolved oxygen simulated by 12 global ocean models participating in the second phase of the Ocean Carbon-cycle Model Intercomparison Project. A common, simple biogeochemical model is utilized in different coarse-resolution ocean circulation models. The model mean (±1σ) downward flux of organic matter across 75 m depth is 17 ± 6 Pg C yr−1. Model means of globally averaged particle export, the fraction of total export in dissolved form, surface semilabile dissolved organic carbon (DOC), and seasonal net outgassing (SNO) of oxygen are in good agreement with observation-based estimates, but particle export and surface DOC are too high in the tropics. There is a high sensitivity of the results to circulation, as evidenced by (1) the correlation of surface DOC and export with circulation metrics, including chlorofluorocarbon inventory and deep-ocean radiocarbon, (2) very large intermodel differences in Southern Ocean export, and (3) greater export production, fraction of export as DOM, and SNO in models with explicit mixed layer physics. However, deep-ocean oxygen, which varies widely among the models, is poorly correlated with other model indices. Cross-model means of several biogeochemical metrics show better agreement with observation-based estimates when restricted to those models that best simulate deep-ocean radiocarbon. Overall, the results emphasize the importance of physical processes in marine biogeochemical modeling and suggest that the development of circulation models can be accelerated by evaluating them with marine biogeochemical metrics.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Climate and Environmental Physics
08 Faculty of Science > Physics Institute

UniBE Contributor:

Joos, Fortunat and Plattner, Gian-Kasper

Subjects:

500 Science > 530 Physics

ISSN:

0886-6236

Publisher:

American Geophysical Union

Language:

English

Submitter:

Factscience Import

Date Deposited:

04 Oct 2013 14:59

Last Modified:

05 Dec 2022 14:18

Publisher DOI:

10.1029/2006GB002857

Web of Science ID:

000248872300003

BORIS DOI:

10.48350/25261

URI:

https://boris.unibe.ch/id/eprint/25261 (FactScience: 57566)

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