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Different proxies for the reactivity of aquatic sediments towards oxygen: A model assessment

Author

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  • Van Frausum, Johan
  • Middelburg, Jack J.
  • Soetaert, Karline
  • Meysman, Filip J.R.

Abstract

Information on benthic carbon mineralization rates is often derived from the analysis of oxygen microprofiles in sediments. To enable a direct comparison of different sediment environments, it is often desirable to characterize sediments by a single proxy that expresses their “reactivity” towards oxygen. For this, there are three commonly used proxies: the oxygen penetration depth (OPD), the oxygen flux at the sediment–water interface (DOU), and the maximum volumetric oxygen consumption rate (Rmax). The OPD can be directly determined from the oxygen depth profile, while the DOU is usually obtained by a linear fit to the oxygen gradient either in diffusive boundary layer. The oxygen consumption rate Rmax requires the fitting of a reactive-transport model to the data profile. This article shows that the OPD alone is a suboptimal proxy, because it shows a strong dependence on the half-saturation constant Ks, and secondly, because it is sensitive to the particular re-oxidation conditions right above the oxic–anoxic interface. Similarly, the volumetric oxygen consumption rate Rmax is rather strongly dependent on the kinetic model formulation employed. To show this we fitted three different (Bouldin, Blackman and Monod) kinetics to the same oxygen data profiles. When fitting these models, the Rmax values obtained differed by 20% for exactly the same oxygen profile. Accordingly, if one reports Rmax values, it is crucial to specify the kinetic model alongside. Overall, DOU emerges as sediment reactivity proxy which is the least model dependent.

Suggested Citation

  • Van Frausum, Johan & Middelburg, Jack J. & Soetaert, Karline & Meysman, Filip J.R., 2010. "Different proxies for the reactivity of aquatic sediments towards oxygen: A model assessment," Ecological Modelling, Elsevier, vol. 221(17), pages 2054-2067.
    • Handle: RePEc:eee:ecomod:v:221:y:2010:i:17:p:2054-2067
    DOI: 10.1016/j.ecolmodel.2010.06.001
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    References listed on IDEAS

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    1. Soetaert, Karline & Petzoldt, Thomas, 2010. "Inverse Modelling, Sensitivity and Monte Carlo Analysis in R Using Package FME," Journal of Statistical Software, Foundation for Open Access Statistics, vol. 33(i03).
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    More about this item

    Keywords

    Modelling; Sediment biogeochemistry; O2 penetration; O2 uptake; O2 consumption rates;
    All these keywords.

    JEL classification:

    • O2 - Economic Development, Innovation, Technological Change, and Growth - - Development Planning and Policy
    • O2 - Economic Development, Innovation, Technological Change, and Growth - - Development Planning and Policy
    • O2 - Economic Development, Innovation, Technological Change, and Growth - - Development Planning and Policy

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