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Global ocean phosphate and oxygen simulations

Global ocean phosphate and oxygen simulations,10.1029/95GB01902,Global Biogeochemical Cycles,Laurence A. Anderson,Jorge L. Sarmiento

Global ocean phosphate and oxygen simulations   (Citations: 57)
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We examine the role of dissolved organic matter (DOM) and the stoichiometric ratios of organic matter remineralization in determining the magnitude and distribution of remineralization of organic matter in the oceanic water column, and the impact of this remineralization on tracer distributions. Our aim is to improve the parameterization of relevant processes in ocean general circulation models by bringing the models into closer agreement with new observational constraints that suggest substantial differences from previous work (lower DOM levels and higher -Oâ/P ratios). We used phosphate and apparent oxygen utilization (AOU) to analyze the effect of the remineralization profile on water column tracer distributions. The primary impact of DOM cycling is to modify the distribution of remineralization over that obtained from a model with particle cycling only. Changing the oxygen-to-phosphorous stoichiometric ratio modifies the magnitude of oxygen utilization, but preserves its basic distribution. We find that even a small amount of DOM is sufficient to prevent the problem of nutrient trapping. Improved phosphate and AOU simulations are obtained when the amount of DOM is reduced and the deep ocean -Oâ/P ratio is increased in accord with recent observations of these properties. 43 refs., 18 figs.
Journal: Global Biogeochemical Cycles - GLOBAL BIOGEOCHEM CYCLE , vol. 9, no. 4, pp. 621-636, 1995
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    • ...the model to equilibrium is to integrate Eq. (1) forward it time until the...
    • ...1989). Some other important properties of P are that: (1) it is independent...

    Xingwen Liet al. A fast Newton–Krylov solver for seasonally varying global ocean biogeo...

    • ...The excess buildup of phosphate concentrations, similar to the “nutrient trapping” problem found in previous studies (e.g., Najjar et al. 1992; Anderson and Sarmiento 1995; Aumont et al. 1999), is therefore a consequence of the interaction between ocean dynamics and biological processes...
    • ...Previous studies argued that the problem of “nutrient trapping” is a result of the lack of dissolved organic matter (DOM) in ocean models (e.g., Bacastow and Maier-Reimer 1990; Najjar et al. 1992; Anderson and Sarmiento 1995)...

    Long Caoet al. Learning about the ocean carbon cycle from observational constraints a...

    • ...The OCMIP-2 approach to describing the phosphorus cycle is based on the ‘nutrient restoring’ approach of Najjar et al. (1992) and Anderson and Sarmiento (1995), but it also includes a semi-labile pool of DOC...

    TOBIAS NAEGLERet al. On evaluating ocean models with atmospheric potential oxygen

    • ...[34] The most dramatic improvements are in the eastern tropical Pacific (Figure 1) where the optimized parameters reduce the excessive nutrient trapping according to the mechanism first suggested by Najjar et al. [1992] and Anderson and Sarmiento [1995], i.e., by allowing more nutrients to be transported away from the upwelling zone in dissolved organic form...
    • ...Increasing 1/k has a similar effect by allowing DOP to be transported farther from the upwelling region before being remineralized into PO4 thus decreasing the so-called nutrient trapping effect [Anderson and Sarmiento, 1995; Matear and Holloway, 1995; Aumont et al., 1999]...

    Eun Young Kwonet al. Optimization and sensitivity study of a biogeochemistry ocean model us...

    • ...[34] The most dramatic improvements are in the eastern tropical Pacific (Figure 1) where the optimized parameters reduce the excessive nutrient trapping according to the mechanism first suggested by Najjar et al. [1992] and Anderson and Sarmiento [1995], i.e., by allowing more nutrients to be transported away from the upwelling zone in dissolved organic form...
    • ...Increasing 1/k has a similar effect by allowing DOP to be transported farther from the upwelling region before being remineralized into PO4 thus decreasing the so-called nutrient trapping effect [Anderson and Sarmiento, 1995; Matear and Holloway, 1995; Aumont et al., 1999]...

    Eun Young Kwonet al. Optimization and sensitivity study of a biogeochemistry ocean model us...

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