Modeling estuarine nutrient geochemistry in a simple system

Details Modeling estuarine nutrient geochemistry in a simple system Modeling estuarine nutrient geochemistry in a simple system

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48.1417w&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 48, Issue 7, pp.1417-1433

Mathematics

Logic

13

Scientific paper

We present a model of estuarine mixing, removal, and input for dissolved constituents, and apply the model to 39 nutrient (P, N, Si) profiles collected over a 14-month period in a pristine river/ estuary: Ochlockonee Bay, Florida. Each profile is deconvolved into three component functions: linear mixing (conservative) first-order removal (biological productivity), and parabolic input (regeneration). After correction for temporal variations in the fluvial end-members, the model provides quantitative estimates of total estuarine primary production, net regeneration, and subsequent fluxes to the ocean over a year-long period. The modeled data set is internally self-consistent: virtually perfect mass balances are obtained for P and Si. All biological P-uptake is regenerated within the estuary so that virtually 100% of the fluvial reactive-P enters the ocean. One-third of the fluvial reactive-P enters the estuary as particles whose phosphate is released after deposition in estuarine sediments. About 20% of the dissolved fluvial silica flux is removed biologically; all of this biogenic silica dissolves in the estuary and enters the ocean. N cannot be mass balanced, probably because it enters and escapes the bay in unmeasured forms (as NH 4 or via denitrification to N 2 and N 2 O). In the Ochlockonee, biological productivity removes nutrients in the ratios N:P 9:1 and Si:P 20:1.

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