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Interpretation of Measured Concentration Profiles in Sediment Pore Water

Peter Berg, Nils Risgaard-Petersen and Soren Rysgaard
Limnology and Oceanography
Vol. 43, No. 7 (Nov., 1998), pp. 1500-1510
Stable URL: http://www.jstor.org/stable/2839032
Page Count: 11
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Interpretation of Measured Concentration Profiles in Sediment Pore Water
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Abstract

A robust numerical procedure for biogeochemical interpretation and analysis of measured concentration profiles of solutes in sediment pore water has been developed. Assuming that the concentration-depth profile represents a steady state, the rate of net production or consumption as a function of depth can be calculated, together with the flux across the sediment-water interface. Three kinds of vertical transport can be included in the analysis: molecular diffusion, bioturbation, and irrigation. The procedure involves finding a series of least square fits to the measured concentration profile, followed by comparisons of these fits through statistical F-testing. This approach leads to an objective selection of the simplest production-consumption profile that reproduces the concentration profile. Because the numerical procedure is optimized with respect to speed, one prediction can typically be done in a few minutes or less on a personal computer. The technique has been tested successfully against analytical solutions describing the transport and consumption of O2 in sediment pore water. In other tests, measured concentration profiles of $O_2, NO_3^-, NH_4^+, and \sumCO_2$ have been interpreted Using the New Produce.

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