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| Titel |
Ten-year trends in atmospheric mercury concentrations, meteorological effects and climate variables at Zeppelin, Ny-Ålesund |
| VerfasserIn |
T. Berg, K. A. Pfaffhuber, A. S. Cole, O. Engelsen, A. Steffen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 13, no. 13 ; Nr. 13, no. 13 (2013-07-11), S.6575-6586 |
| Datensatznummer |
250018754
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| Publikation (Nr.) |
 copernicus.org/acp-13-6575-2013.pdf |
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| Zusammenfassung |
| Results from ten years of gaseous elemental mercury (GEM) measurements at
Zeppelin station, Ny-Ålesund, 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 pg m−3 yr−1) and significantly increasing trends in May and July
through December (1.5 to 28.7 pg m−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 11 m s−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. |
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