Nutrient transports in a Swedish estuary |
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| Authors: | Wayne Wilmot Peter Toll Björn Kjerfve |
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| Institution: | 1. Askö Laboratory, Institute of Marine Ecology, University of Stockholm, S-10691 Stockholm, Sweden;2. Belle W. Baruch Institute for Marine Biology and Coastal Research, Marine Science Program, Department of Geology, University of South Carolina, Columbia, South Carolina 29208, U.S.A. |
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| Abstract: | Himmerfjärd is a Swedish estuary bordering on the Baltic. The estuary lacks astronomical tides and its circulation is driven by winds and freshwater runoff. Because of a tertiary sewage treatment plant located at its inner end, the estuary is becoming increasingly eutrophic. A field study was carried out for a 78-day period in late summer and early fall of 1977 to determine rates of nutrient transport and to construct nutrient budgets. Since physical parameters (current velocity, temperature, salinity, winds and water level changes) were measured more frequently than nutrients (phosphate, nitrate, nitrite and ammonium) it was necessary to develop a suitable method to calculate nutrient flux time series and net nutrient fluxes. Over the study period, Himmerfjärd imported phosphorus and exported nitrogen. Direction of nutrient fluxes and changes in flux direction were consistent with the structure of the baroclinic currents. |
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| Keywords: | nutrients current measurements estuaries time series Baltic Sea |
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