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| Titel |
Two years of measurements of atmospheric total gaseous mercury (TGM) at a remote site in Mt. Changbai area, Northeastern China |
| VerfasserIn |
X. W. Fu, X. Feng, L. H. Shang, S. F. Wang, 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 ; 12, no. 9 ; Nr. 12, no. 9 (2012-05-11), S.4215-4226 |
| Datensatznummer |
250011130
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| Publikation (Nr.) |
 copernicus.org/acp-12-4215-2012.pdf |
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| Zusammenfassung |
| Total gaseous mercury (TGM) was continuously monitored at a remote site (CBS)
in Mt. Changbai area, Northeastern China from 24 October 2008 to 31 October
2010. The overall mean TGM concentration was 1.60±0.51 ng m−3,
which is lower than those reported from remote sites in Eastern,
Southwestern, and Western China, indicating a relatively lower regional
anthropogenic mercury (Hg) emission intensity in Northeastern China.
Measurements at a site in the vicinity (~1.2 km) of CBS station from
August 2005 to July 2006 showed a significantly higher mean TGM concentration
of 3.58±1.78 ng m−3. The divergent result was partially
attributed to fluctuations in the relatively frequencies of surface winds
during the two study periods and moreover an effect of local emission
sources. The temporal variation of TGM at CBS was influenced by regional
sources as well as long-range transported Hg. Regional sources frequently
contributing to episodical high TGM concentrations were pin-pointed as a
large iron mining district in Northern North Korea and two large power plants
and urban areas to the southwest of the sampling site. Source areas in
Beijing, Tianjin, southern Liaoning, Hebei, northwestern Shanxi, and
northwestern Shandong were found to contribute to elevated TGM observations
at CBS via long-range transport. Diurnal pattern of TGM at CBS was mainly
controlled by regional sources, likely as well as intrusion of air masses
from the free troposphere during summer season. There are no consistent
seasonal pattern of TGM at CBS, and the monthly TGM variations showed links
with the patterns of regional air movements and long-range transport. |
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