Preprints
https://doi.org/10.5194/acp-2020-1287
https://doi.org/10.5194/acp-2020-1287

  20 Jan 2021

20 Jan 2021

Review status: this preprint is currently under review for the journal ACP.

Dynamics of gaseous oxidized mercury at Villum Research Station during the High Arctic summer

Jakob Boyd Pernov, Bjarne Jensen, Andreas Massling, Daniel Charles Thomas, and Henrik Skov Jakob Boyd Pernov et al.
  • Department of Environmental Science, iClimate, Arctic Research Center, Aarhus University, Frederiksborgvej 399, 4000 Roskilde, Denmark

Abstract. While much research has been devoted to the subject of gaseous elemental mercury (GEM) and gaseous oxidized mercury (GOM) in the Arctic spring, during atmospheric mercury depletion events, few studies have examined the behavior of GOM in the High Arctic summer. GOM, once introduced into the ecosystem, can pose a threat to human and wildlife health, though there remain large uncertainties regarding the transformation, deposition, and assimilation of mercury into the ecosystem. Therefore, to further our understanding of the dynamics of gaseous oxidized mercury in the High Arctic during the late summer, we performed measurements of GEM and GOM along with meteorological parameters, atmospheric constituents, and air mass history during two summer campaigns in 2019 and 2020 at Villum Research Station (Villum) in Northeastern Greenland. Five events of enhanced GOM concentrations were identified and investigated in greater detail. The origin of these events was identified, through analysis of air mass back-trajectories, associated meteorological data, and other atmospheric constituents, to be the cold, dry free troposphere. These events were associated with low RH, limited precipitation, cold temperatures, and intense sunlight along the trajectory path. Events were positively correlated with ozone, aerosol particle number, and black carbon mass concentration, which were interpreted as an indication of tropospheric air masses. This work aims to provide a better understanding of the dynamics of GOM during the High Arctic summer.

Jakob Boyd Pernov et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2020-1287', Anonymous Referee #3, 03 Feb 2021
  • RC2: 'Comment on acp-2020-1287', Anonymous Referee #1, 14 Feb 2021
  • RC3: 'Comment on acp-2020-1287', Anonymous Referee #4, 24 Apr 2021

Jakob Boyd Pernov et al.

Jakob Boyd Pernov et al.

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Short summary
Atmospheric mercury species (GEM, GOM, PHg) are important constituents in the High Arctic, due to their detrimental effects on human and ecosystem health. However, understanding of its behavior in the High Arctic summer remains lacking. This research investigates the dynamics of mercury oxidation in the High Arctic summer, with respect to sources, sinks, and other atmospheric species. The cold, dry free troposphere was demonstrated to be the source of GOM in the High Arctic summer.
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