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| Titel |
A 2-year record of atmospheric mercury species at a background Southern Hemisphere station on Amsterdam Island |
| VerfasserIn |
H. Angot, M. Barret, O. Magand, M. Ramonet, A. Dommergue |
| 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 ; 14, no. 20 ; Nr. 14, no. 20 (2014-10-30), S.11461-11473 |
| Datensatznummer |
250119131
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| Publikation (Nr.) |
 copernicus.org/acp-14-11461-2014.pdf |
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| Zusammenfassung |
| Although essential to fully understand the cycling of mercury at the global
scale, mercury species records in the Southern Hemisphere are scarce. Under
the framework of the Global Mercury Observation System (GMOS) project, a
monitoring station has been set up on Amsterdam Island (37°48´ S,
77°34´ E) in the remote southern Indian Ocean. For the first time
in the Southern Hemisphere, a 2-year record of gaseous elemental mercury
(GEM), reactive gaseous mercury (RGM) and particle-bound mercury (PBM) is
presented. GEM concentrations were remarkably steady
(1.03 ± 0.08 ng m−3) while RGM and PBM concentrations were very
low and exhibited a strong variability (mean: 0.34 pg m−3, range:
< detection limit–4.07 pg m−3; and mean: 0.67 pg m−3, range:
< detection limit–12.67 pg m−3, respectively). Despite the
remoteness of the island, wind sector analysis, air mass back trajectories
and the observation of radonic storms highlighted a long-range contribution
from the southern African continent to the GEM and PBM budgets from July to
September during the biomass burning season. Low concentrations of GEM were
associated with southerly polar and marine air masses from the remote
southern Indian Ocean. This unique data set provides new baseline GEM
concentrations in the Southern Hemisphere midlatitudes while mercury
speciation along with upcoming wet deposition data will help to improve our
understanding of the mercury cycle in the marine boundary layer. |
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