Abstract
The total gaseous mercury (TGM) in air over the coastal station at Hel and over the southern Baltic Sea was measured during the summer and winter conditions. Recorded 30-min resolution TGM data showed both higher concentrations and variability during the summer compared to the winter conditions. The summer TGM data ranged from 1.1 to 7.5 ng m −3, while the winter data ranged from 0.8 to 4.4 ng m −3. The TGM content in air over the southern Baltic Sea indicated that, in general, during the summer conditions, the sea-to-air transport of gaseous mercury dominated, while during the winter season, a tendency of gaseous mercury to sink into the water has been found. The evidences of enhanced water-to-air transfer of mercury vapour were noted, in particular, over the shallow waters of the Gulf of Gdańsk under the strong water-to-air temperature gradients. Obtained results indicate that under such conditions, the coastal waters could act as a significant source of mercury vapour that may contribute to the overall budget of atmospheric mercury over the Baltic proper.
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