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| Titel |
Atmospheric gaseous elemental mercury (GEM) concentrations and mercury depositions at a high-altitude mountain peak in south China |
| VerfasserIn |
X. W. Fu, X. Feng, Z. Q. Dong, R. S. Yin, J. X. Wang, Z. R. Yang, H. Zhang |
| 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 ; 10, no. 5 ; Nr. 10, no. 5 (2010-03-11), S.2425-2437 |
| Datensatznummer |
250008178
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| Publikation (Nr.) |
 copernicus.org/acp-10-2425-2010.pdf |
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| Zusammenfassung |
| China is regarded as the largest contributor of mercury (Hg) to the global
atmospheric Hg budget. However, concentration levels and depositions of
atmospheric Hg in China are poorly known. Continuous measurements of
atmospheric gaseous elemental mercury (GEM) were carried out from May 2008
to May 2009 at the summit of Mt. Leigong in south China. Simultaneously,
deposition fluxes of THg and MeHg in precipitation, throughfall and
litterfall were also studied. Atmospheric GEM concentrations averaged
2.80±1.51 ng m−3, which was highly elevated compared to global
background values but much lower than semi-rural and industrial/urban areas
in China. Sources identification indicates that both regional industrial
emissions and long range transport of Hg from central, south and southwest
China were corresponded to the elevated GEM level. Seasonal and diurnal
variations of GEM were observed, which reflected variations in source
intensity, deposition processes and meteorological factors. Precipitation
and throughfall deposition fluxes of THg and MeHg in Mt. Leigong were
comparable or lower compared to those reported in Europe and North America,
whereas litterfall deposition fluxes of THg and MeHg were higher compared to
Europe and North America. This highlights the importance of vegetation to Hg
atmospheric cycling. In th remote forest ecosystem of China, deposition of
GEM via uptake of foliage followed by litterfall was very important for the
depletion of atmospheric Hg. Elevated GEM level in ambient air may
accelerate the foliar uptake of Hg through air which may partly explain the
elevated litterfall deposition fluxes of Hg observed in Mt. Leigong. |
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