Mercury Concentrations over the Baltic Sea
نویسنده
چکیده
Mercury is a toxic pollutant emitted from both natural sources and through human 7 activities. A global interest in atmospheric mercury has risen ever since the discovery of the 8 Minamata disease in 1956. Properties of gaseous elemental mercury enable long range transport 9 which can cause pollution even in pristine environments. Total gaseous mercury (TGM) was 10 measured from winter 2016 to spring 2017 over the Baltic Sea. A Tekran 2357A mercury analyser 11 was installed aboard the research and icebreaking vessel Oden for the purpose of continuous 12 measurements of gaseous mercury in ambient air. Measurements were performed during a 13 campaign along the Swedish east coast and in the Bothnian Bay near Lulea during the icebreaking 14 season. Data was evaluated from Gothenburg using a plotting software and back trajectories for air 15 masses were calculated. The TGM average of 1.365 ± 0.054 ng/m3 during winter and 1.288 ± 0.140 16 ng/m3 during spring was calculated as well as a total average of 1.362 ± 0.158 ng/m3. Back trajectories 17 showed a possible correlation of anthropogenic sources elevating the mercury background level in 18 some areas. There were also indications of depleted air, i.e., air with lower concentrations than 19 average, being transported from the Arctic to northern Sweden resulting in a drop in TGM levels. 20
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