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    Evaluating global ocean carbon models : the importance of realistic physics

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    2003GB002150.pdf (2.669Mb)
    Date
    2004-09-15
    Author
    Doney, Scott C.  Concept link
    Lindsay, Keith  Concept link
    Caldeira, Ken  Concept link
    Campin, J.-M.  Concept link
    Drange, Helge  Concept link
    Dutay, J.-C.  Concept link
    Follows, Michael J.  Concept link
    Gao, Y.  Concept link
    Gnanadesikan, Anand  Concept link
    Gruber, Nicolas  Concept link
    Ishida, Akio  Concept link
    Joos, Fortunat  Concept link
    Madec, G.  Concept link
    Maier-Reimer, Ernst  Concept link
    Marshall, John C.  Concept link
    Matear, Richard J.  Concept link
    Monfray, Patrick  Concept link
    Mouchet, Anne  Concept link
    Najjar, Raymond G.  Concept link
    Orr, James C.  Concept link
    Plattner, Gian-Kasper  Concept link
    Sarmiento, Jorge L.  Concept link
    Schlitzer, Reiner  Concept link
    Slater, Richard D.  Concept link
    Totterdell, Ian J.  Concept link
    Weirig, Marie-France  Concept link
    Yamanaka, Yasuhiro  Concept link
    Yool, Andrew  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/3394
    As published
    https://doi.org/10.1029/2003GB002150
    Keyword
     Global carbon models; Ocean carbon systems; OCMIP-2 
    Abstract
    A suite of standard ocean hydrographic and circulation metrics are applied to the equilibrium physical solutions from 13 global carbon models participating in phase 2 of the Ocean Carbon-cycle Model Intercomparison Project (OCMIP-2). Model-data comparisons are presented for sea surface temperature and salinity, seasonal mixed layer depth, meridional heat and freshwater transport, 3-D hydrographic fields, and meridional overturning. Considerable variation exists among the OCMIP-2 simulations, with some of the solutions falling noticeably outside available observational constraints. For some cases, model-model and model-data differences can be related to variations in surface forcing, subgrid-scale parameterizations, and model architecture. These errors in the physical metrics point to significant problems in the underlying model representations of ocean transport and dynamics, problems that directly affect the OCMIP predicted ocean tracer and carbon cycle variables (e.g., air-sea CO2 flux, chlorofluorocarbon and anthropogenic CO2 uptake, and export production). A substantial fraction of the large model-model ranges in OCMIP-2 biogeochemical fields (±25–40%) represents the propagation of known errors in model physics. Therefore the model-model spread likely overstates the uncertainty in our current understanding of the ocean carbon system, particularly for transport-dominated fields such as the historical uptake of anthropogenic CO2. A full error assessment, however, would need to account for additional sources of uncertainty such as more complex biological-chemical-physical interactions, biases arising from poorly resolved or neglected physical processes, and climate change.
    Description
    Author Posting. © American Geophysical Union, 2004. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Global Biogeochemical Cycles 18 (2004): GB3017, doi:10.1029/2003GB002150.
    Collections
    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Global Biogeochemical Cycles 18 (2004): GB3017
     

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