fluxes of gaseous elemental mercury (gem) in the high arctic during atmospheric mercury depletion events (amdes)
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2018
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Abstract
Measurements of gaseous elemental mercury (GEM) fluxes over snow
surfaces using a relaxed eddy accumulation (REA) system are carried
out at the High Arctic site at the Villum Research Station, Station Nord, in
North Greenland. Simultaneously, CO2 fluxes are determined
using the eddy covariance (EC) technique. The REA system with
dual inlets and dual analyzers is used to measure fluxes directly
over the snow. The measurements were carried out from 23 April to
12 May during spring 2016, where atmospheric mercury depletion
events (AMDEs) took place. The measurements showed a net emission of
8.9 ng m−2 min−1, with only a few minor episodes of
net depositional fluxes, from a maximum deposition of
8.1 ng m−2 min−1 to a maximum emission of
179.2 ng m−2 min−1. The data support the theory that
gaseous oxidized mercury (GOM) is deposited during AMDEs followed by
formation of GEM on surface snow and is re-emitted as GEM shortly
after the AMDEs. Furthermore, observation of the relation between
GEM fluxes and atmospheric temperature suggests that GEM emission
partly could be affected by surface heating. However, it is also
clear that the GEM emissions are affected by many parameters.
| Reference Key |
kamp2018atmosphericfluxes
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|---|---|
| Authors | ;J. Kamp;J. Kamp;H. Skov;H. Skov;B. Jensen;B. Jensen;L. L. Sørensen;L. L. Sørensen |
| Journal | Journal of agricultural and food chemistry |
| Year | 2018 |
| DOI |
10.5194/acp-18-6923-2018
|
| URL | |
| Keywords |
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