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)

R. G. Najjar, X. Jin, F. Louanchi, Olivier Aumont, K. Caldeira, S. C. Doney, Jean Claude Dutay, Mick Follows, Nicolas Gruber, F. Joos, K. Lindsay, Ernst Maier-Reimer, Richard J. Matear, K. Matsumoto, P. Monfray, A. Mouchet, J. C. Orr, G. K. Plattner, J. L. Sarmiento, Reiner SchlitzerR. D. Slater, M. F. Weirig, Y. Yamanaka, Axy Yool

Research output: Contribution to journalArticle

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Abstract

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.

Original languageEnglish (US)
Article numberGB3007
JournalGlobal Biogeochemical Cycles
Volume21
Issue number3
DOIs
StatePublished - Sep 2007

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Dissolved oxygen
carbon cycle
dissolved organic matter
Biological materials
dissolved oxygen
Carbon
ocean
Organic carbon
dissolved organic carbon
Degassing
project
Chlorofluorocarbons
Oxygen
Tropics
oxygen
CFC
global ocean
mixed layer
physics
Physics

All Science Journal Classification (ASJC) codes

  • Global and Planetary Change
  • Environmental Chemistry
  • Environmental Science(all)
  • Atmospheric Science

Cite this

Najjar, R. G. ; Jin, X. ; Louanchi, F. ; Aumont, Olivier ; Caldeira, K. ; Doney, S. C. ; Dutay, Jean Claude ; Follows, Mick ; Gruber, Nicolas ; Joos, F. ; Lindsay, K. ; Maier-Reimer, Ernst ; Matear, Richard J. ; Matsumoto, K. ; Monfray, P. ; Mouchet, A. ; Orr, J. C. ; Plattner, G. K. ; Sarmiento, J. L. ; Schlitzer, Reiner ; Slater, R. D. ; Weirig, M. F. ; Yamanaka, Y. ; Yool, Axy. / 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). In: Global Biogeochemical Cycles. 2007 ; Vol. 21, No. 3.
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abstract = "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.",
author = "Najjar, {R. G.} and X. Jin and F. Louanchi and Olivier Aumont and K. Caldeira and Doney, {S. C.} and Dutay, {Jean Claude} and Mick Follows and Nicolas Gruber and F. Joos and K. Lindsay and Ernst Maier-Reimer and Matear, {Richard J.} and K. Matsumoto and P. Monfray and A. Mouchet and Orr, {J. C.} and Plattner, {G. K.} and Sarmiento, {J. L.} and Reiner Schlitzer and Slater, {R. D.} and Weirig, {M. F.} and Y. Yamanaka and Axy Yool",
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doi = "10.1029/2006GB002857",
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Najjar, RG, Jin, X, Louanchi, F, Aumont, O, Caldeira, K, Doney, SC, Dutay, JC, Follows, M, Gruber, N, Joos, F, Lindsay, K, Maier-Reimer, E, Matear, RJ, Matsumoto, K, Monfray, P, Mouchet, A, Orr, JC, Plattner, GK, Sarmiento, JL, Schlitzer, R, Slater, RD, Weirig, MF, Yamanaka, Y & Yool, A 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, vol. 21, no. 3, GB3007. https://doi.org/10.1029/2006GB002857

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, Olivier; Caldeira, K.; Doney, S. C.; Dutay, Jean Claude; Follows, Mick; Gruber, Nicolas; Joos, F.; Lindsay, K.; Maier-Reimer, Ernst; Matear, Richard J.; Matsumoto, K.; Monfray, P.; Mouchet, A.; Orr, J. C.; Plattner, G. K.; Sarmiento, J. L.; Schlitzer, Reiner; Slater, R. D.; Weirig, M. F.; Yamanaka, Y.; Yool, Axy.

In: Global Biogeochemical Cycles, Vol. 21, No. 3, GB3007, 09.2007.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Impact of circulation on export production, dissolved organic matter, and dissolved oxygen in the ocean

T2 - Results from Phase II of the Ocean Carbon-cycle Model Intercomparison Project (OCMIP-2)

AU - Najjar, R. G.

AU - Jin, X.

AU - Louanchi, F.

AU - Aumont, Olivier

AU - Caldeira, K.

AU - Doney, S. C.

AU - Dutay, Jean Claude

AU - Follows, Mick

AU - Gruber, Nicolas

AU - Joos, F.

AU - Lindsay, K.

AU - Maier-Reimer, Ernst

AU - Matear, Richard J.

AU - Matsumoto, K.

AU - Monfray, P.

AU - Mouchet, A.

AU - Orr, J. C.

AU - Plattner, G. K.

AU - Sarmiento, J. L.

AU - Schlitzer, Reiner

AU - Slater, R. D.

AU - Weirig, M. F.

AU - Yamanaka, Y.

AU - Yool, Axy

PY - 2007/9

Y1 - 2007/9

N2 - 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.

AB - 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.

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