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| Titel |
Intercontinental transport and deposition patterns of atmospheric mercury from anthropogenic emissions |
| VerfasserIn |
L. Chen, H. H. Wang, J. F. Liu, Y. D. Tong, L. B. Ou, W. Zhang, D. Hu, C. Chen, X. J. Wang |
| 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. 18 ; Nr. 14, no. 18 (2014-09-24), S.10163-10176 |
| Datensatznummer |
250119062
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| Publikation (Nr.) |
 copernicus.org/acp-14-10163-2014.pdf |
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| Zusammenfassung |
| Global policies that regulate anthropogenic mercury emissions to the
environment require quantitative and comprehensive source–receptor
relationships for mercury emissions, transport and deposition among major
continental regions. In this study, we use the GEOS-Chem global chemical transport model to establish
source–receptor relationships among 11 major continental regions
worldwide. Source–receptor relationships for surface mercury concentrations
(SMC) show that some regions (e.g., East Asia, the Indian subcontinent, and
Europe) should be responsible for their local surface Hg(II) and Hg(P)
concentrations due to near-field transport and deposition contributions
from their local anthropogenic emissions (up to 64 and 71% for
Hg(II) and Hg(P), respectively, over East Asia). We define the region of primary
influence (RPI) and the region of secondary influence (RSI) to establish
intercontinental influence patterns. Results indicate that East Asia is the
SMC RPI for almost all other regions, while Europe, Russia, and the Indian
subcontinent also make some contributions to SMC over some receptor regions
because they are dominant RSI source regions. Source–receptor relationships
for mercury deposition show that approximately 16 and 17% of dry
and wet deposition, respectively, over North America originate from East
Asia, indicating that transpacific transport of East Asian emissions is the
major foreign source of mercury deposition in North America. Europe,
Southeast Asia, and the Indian subcontinent are also important mercury
deposition sources for some receptor regions because they are the dominant RSIs.
We also quantify seasonal variation on mercury deposition contributions over
other regions from East Asia. Results show that mercury deposition
(including dry and wet) contributions from East Asia over the Northern
Hemisphere receptor regions (e.g., North America, Europe, Russia, the Middle
East, and Middle Asia) vary seasonally, with the maximum values in summer and
minimum values in winter. The opposite seasonal pattern occurs on mercury
dry deposition contributions over Southeast Asia and the Indian
subcontinent. |
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