Measured and modelled effects of temperature,dissolved oxygen and nutrient concentration on sediment-water nutrient exchange |
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Authors: | Carl F Cerco |
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Institution: | (1) College of William and Mary, Virginia Institute of Marine Science, Gloucester Point, Va., U.S.A.;(2) Present address: Mail Stop ES-Q, U.S. Army Engineer Waterways Experiment Station, P.O. Box 631, 39180 Vicksburg, MS, U.S.A. |
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Abstract: | Empirical models of sediment-water fluxes of NH4
+, NO3
– were and PO4
3– were formed based on published reports. The models were revised and parameters evaluated based on laboratory incubations of sediments collected from Gunston Cove, VA. Observed fluxes ranged from — 18 (sediments uptake) to 276 (sediment release) mg NH4
+ m–2 day–1, –17 to –509 mg NO3
– m–2 day–1, and –16.4 to 8.9 mg PO4
3– m–2 day–1. The model and observations indicated release of NH4
+ was enhanced by high temperature and by low DO. Uptake of NO3
– was enhanced primarily by high NO3
– concentration and to a lesser extent by high temperature and by low DO. Direction of PO4
3– flux depended on concentration in the water. Release was enhanced by low DO. No effect of temperature on PO4
3– flux was observed. |
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Keywords: | sediments models nutrients nitrogen phosphorus Chesapeake Bay Gunston Cove |
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