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Ten-year trends in atmospheric mercury concentrations, meteorological effects and climate variables at Zeppelin, Ny-Ålesund

Berg, Torunn; Cole, AS; Engelsen, Ola; Steffen, A; Pfaffhuber, Katrine Aspmo
Journal article, Peer reviewed
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URI
http://hdl.handle.net/11250/2359723
Date
2013
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Original version
Atmospheric Chemistry And Physics 2013, 13(13):6575-6586   10.5194/acp-13-6575-2013
Abstract
Results from ten years of gaseous elemental mercury

(GEM) measurements at Zeppelin station, Ny-A° lesund,

Svalbard, show no overall annual trend between 2000 and

2009. Seasonal trend analysis showed significantly decreasing

trends in January, February, March and June (−4.5 to

−14.9 pgm−3 yr−1) and significantly increasing trends in

May and July through December (1.5 to 28.7 pgm−3 yr −1).

Results showed that atmospheric mercury depletion events

(AMDEs) were equally distributed between April and May

with only a few having been observed in March and June.

A negative correlation between AMDEs and temperature is

reported and supports earlier observations that AMDEs tend

to occur at low temperatures. Lower concentrations of GEM

were seen at lower temperatures below a threshold of 0 C.

The occurrence of AMDEs and wind direction were well correlated

with the lowest GEM measured when the wind direction

was from the Arctic Ocean region. Wind speed was

found to not correlate with AMDEs, but the lowest GEM

concentrations were observed at low wind speeds between

4 and 11ms−1. AMDEs and relative humidity did not correlate

well, but the lowest GEM levels appeared when the relative

humidity was between 80 and 90 %. Diurnal variation

was observed especially during the month of March and is

probably due to daytime snow surface emission induced by

solar radiation. Relationships between GEM concentration

and the Northern Hemisphere climate indices were investigated

to assess if these climate parameters might reflect different

atmospheric conditions that enhance or reduce spring

AMDE activity. No consistent pattern was observed.
Publisher
European Geosciences Union
Journal
Atmospheric Chemistry And Physics

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