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Nutrient and persistent pollutant deposition on the Bothnian Bay ice and snow fields |
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| Authors: | Lars Rahm Bertil Håkansson Per Larsson Elisabet Fogelqvist Gudrun Bremle Jorge Valderrama |
| Affiliation: | 1. Dept. of Water and Environmental Studies, Link?ping University, S-581 83, Link?ping, Sweden 2. SMHI, S-601 76, Norrk?ping, Sweden 3. Dept. of Ecology, University of Lund, 5-227 00, Lund, Sweden 4. Dept. of Analytical and Marine Chemistry, University of G?teborg, S-412 96, G?teborg, Sweden 5. Oceanographic Laboratory, SMHI, P.E. 2212, S-403 14, G?teborg, Sweden |
| Abstract: | A study of atmospheric deposited nutrients and some persistent pollutants has been carried out on the ice and snow fields of the subarctic Bothnian Bay, the northernmost basin of the Baltic Sea. Total amounts of 600, 500 and 400 tons NO3-N, NH4-N and Norg-N, respectively are deposited in the snow while the corresponding amounts for Ptot-P is 40 tons. The corresponding amount for PCB and lindane are 1.0 and 0.2 kg, respectively. The measurements were carried out on the snow-covered ice four to six weeks old. A part of the deposited snow has been incorporated -into the snow-ice and an attempt to estimate its mean thickness and its amount of nutrients has been made. The total amounts now reach 1700, 1300 and 1100 tons of NO3-N and NH4-N and Norg-N, respectively in the snow and ice together. The results obtained support the use of land-based stations in estimates of seasonal atmospheric nutrient deposition to the Bothnian Bay. The observed concentrations of chloroorganic compounds correspond to those land-based observations reported from the same latitude in the northern hemisphere and reported in literature. |
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