Preprint Article Version 1 This version not peer reviewed

Ship Based Measurements of Seasonal Atmospheric Mercury Concentrations over the Baltic Sea

Version 1 : Received: 24 November 2017 / Approved: 24 November 2017 / Online: 24 November 2017 (09:00:15 CET)

A peer-reviewed article of this Preprint also exists.

Hoglind, H.; Eriksson, S.; Gardfeldt, K. Ship-Based Measurements of Atmospheric Mercury Concentrations over the Baltic Sea. Atmosphere 2018, 9, 56. Hoglind, H.; Eriksson, S.; Gardfeldt, K. Ship-Based Measurements of Atmospheric Mercury Concentrations over the Baltic Sea. Atmosphere 2018, 9, 56.

Journal reference: Atmosphere 2018, 9, 56
DOI: 10.3390/atmos9020056

Abstract

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

Subject Areas

atmospheric mercury; Baltic Sea; mapping of TGM levels; long range transport

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