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| Titel |
Temporal trend and sources of speciated atmospheric mercury at Waliguan GAW station, Northwestern China |
| VerfasserIn |
X. W. Fu, X. Feng, P. Liang, Deliger, H. Zhang, J. Ji, P. Liu |
| 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 ; 12, no. 4 ; Nr. 12, no. 4 (2012-02-20), S.1951-1964 |
| Datensatznummer |
250010733
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| Publikation (Nr.) |
 copernicus.org/acp-12-1951-2012.pdf |
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| Zusammenfassung |
| Measurements of speciated atmospheric mercury were conducted at a remote
mountain-top station (Waliguan (WLG) Baseline Observatory) at the edge of
northeastern part of the Qinghai-Xizang Plateau, Western China. Mean
concentrations of total gaseous mercury (TGM), particulate bound mercury
(PBM), and gaseous oxidized mercury (GOM) during the whole sampling campaign
were 1.98±0.98 ng m−3, 19.4±18.1 pg m−3, and
7.4±4.8 pg m−3, respectively. Levels of speciated Hg at WLG were
slightly higher than those reported from remote areas of North America and
Europe. Both regional sources and long-rang transport played important roles
in the distribution of atmospheric TGM and PBM at WLG, whereas GOM showed
major links to the regional sources, likely as well as the in-situ
productions via photochemical processes. Regional sources for speciated Hg
were mostly located to the east of WLG, which is the most industrial and
urbanized areas of Qinghai province. Potential source contribution function
(PSCF) results showed that eastern Gansu, western Ningxia and Shanxi
Province were likely the potential source regions of WLG, with good
accordance with locations of urban areas and industrial centers. Moreover,
we found that Northern India may be a significant source region for WLG
during the sampling campaign, and this is the first published evidence
suggesting long-range transport of atmospheric Hg from India to the
Northeastern Tibetan Plateau. Seasonal and diurnal variations of TGM were in
contrast to most of the previous studies in China, with relatively higher
levels in warm seasons and night, respectively. The temporal trend of TGM
also highlighted the impact of long-range transport on the distribution of
TGM in ambient air at WLG. |
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