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Total gaseous mercury over the coastal zone of the Gulf of Gdańsk

Bełdowska M., Falkowska L., Marks R.

Oceanological and Hydrobiological Studies

2003

Vol. 32, No. 3

3-18

Measurements of total gaseous mercury (TGM) were carried out in the Polish coastal zone of the Gulf of Gdańsk from Hel, situated at the end the tip of the Hel Peninsula, to Piaski in the Vistula Pit. The results were recorded in the atmosphere 150 cm above the ground using an automatic analyzer Gardis 1A in March, April and May 1999. The mercury concentration over the coastal zone of the Gulf of Gdańsk did not exceed maximum permissible levels and were at levels similar to those in other maritime regions of the Baltic Sea and the North Sea. The average concentration of mercury was 3.4 ng m-3. Increased TGM concentrations of approximately 8.2 ng m-3 occurred locally near the sewage treatment facility in Sztutowo, on the tip of the Hel Peninsula and in the Tri-Cities near the industrial areas of shipyards and the harbor. No increased concentrations of gaseous mercury were registered in the vicinity of the heat and power plant or the refinery as chimneys release fumes at high altitudes. What is more, the mercury concentrations recorded in the forests of the Vistula Lagoon and the Hel Pit were nine times lower than the average concentration. Laboratory experiments carried out on samples of sea water from three coastal measurement stations proved that mixing in the sea surf zone influences the emission of mercury from the water into the atmosphere. The emission of gaseous mercury from the surface waters of the Gulf of Gdańsk was higher in March when the life processes in the water were still slow and bioaccumulation was very limited.

Nitrogen species and macroelements in aerosols over the southern Baltic Sea

Nadstazik A., Marks R., Schulz M.

Oceanologia

2000

No. 42 (4)

411-424

The annual cycle of atmospheric nitrogen species and macroelements (Na+, K+, Ca2+, Mg2+ and Cl–) over the south-eastern Baltic region was investigated. A one-year record enabled the variability of nitrogen species and macroelements in the aerosol over the coastal station at Hel to be traced. The highest concentrations of sea salt components were recorded in summer, while anthropogenic nitrate concentrations were highest in winter. When the air masses were of mixed marine and continental origin, the nitric acid reacted with coarse sea salt particles to form stable, coarse sodium nitrate. This seems to be a permanent removal pathway for nitrate. Anthropogenic aerosol species like NH4+ or NO3– formed by gas-to-particle conversion were generally associated with fine particles (<1 žm). Coarse particles like sodium or chloride resulted from resuspension from seawater.