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Observational and numerical modeling constraints on the global ocean biological carbon pump
  • +7
  • Scott C. Doney,
  • Kayla Alexis Mitchell,
  • Stephanie Anne Henson,
  • Emma L Cavan,
  • Timothy DeVries,
  • Nicolas Gruber,
  • Judith Hauck,
  • Colleen B. Mouw,
  • Jens Daniel Müller,
  • Francois W. Primeau
Scott C. Doney
University of Virginia

Corresponding Author:[email protected]

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Kayla Alexis Mitchell
University of Virginia
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Stephanie Anne Henson
National Oceanography Centre
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Emma L Cavan
University of Tasmania
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Timothy DeVries
University of California Santa Barbara
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Nicolas Gruber
ETH Zürich
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Judith Hauck
Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research
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Colleen B. Mouw
University of Rhode Island
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Jens Daniel Müller
ETH Zürich
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Francois W. Primeau
University of California, Irvine
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This study characterized ocean biological carbon pump metrics in the second iteration of the REgional Carbon Cycle Assessment and Processes (RECCAP2) project, a coordinated, international effort to constrain contemporary ocean carbon air-sea fluxes and interior carbon storage trends using a combination of observation-based estimates, inverse models, and global ocean biogeochemical models. The analysis here focused on comparisons of global and biome-scale regional patterns in particulate organic carbon production and sinking flux from the RECCAP2 model ensemble against observational products derived from satellite remote sensing, sediment traps, and geochemical methods. There was generally encouraging model-data agreement in large-scale spatial patterns, though with substantial spread across the model ensemble and observational products. The global-integrated, model ensemble-mean export production, taken as the sinking particulate organic carbon flux at 100 m (6.41 ± 1.52 Pg C yr–1), and export ratio defined as sinking flux divided by net primary production (0.154 ± 0.026) both fell at the lower end of observational estimates. Comparison with observational constraints also suggested that the model ensemble may have underestimated regional biological CO2 drawdown and air-sea CO2 flux in high productivity regions. Reasonable model-data agreement was found for global-integrated, ensemble-mean sinking particulate organic carbon flux into the deep ocean at 1000 m (0.95 ± 0.64 Pg C yr–1) and the transfer efficiency defined as flux at 1000m divided by flux at 100m (0.121 ± 0.035), with both variables exhibiting considerable regional variability. Future modeling studies are needed to improve system-level simulation of interaction between model ocean physics and biogeochemical response.
06 Mar 2024Submitted to ESS Open Archive
07 Mar 2024Published in ESS Open Archive