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| Titel |
Estimating mercury emission outflow from East Asia using CMAQ-Hg |
| VerfasserIn |
C.-J. Lin, L. Pan, D. G. Streets, S. K. Shetty, C. Jang, X. Feng, H.-W. Chu, T. C. Ho |
| 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. 4 ; Nr. 10, no. 4 (2010-02-17), S.1853-1864 |
| Datensatznummer |
250008120
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| Publikation (Nr.) |
 copernicus.org/acp-10-1853-2010.pdf |
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| Zusammenfassung |
| East Asia contributes to nearly 50% of the global anthropogenic mercury
emissions into the atmosphere. Recently, there have been concerns about the
long-range transport of mercury from East Asia, which may lead to enhanced
dry and wet depositions in other regions. In this study, we performed four
monthly simulations (January, April, July and October in 2005) using CMAQ-Hg
v4.6 for a number of emission inventory scenarios in an East Asian model
domain. Coupled with mass balance analyses, the chemical transport of
mercury in East Asia and the resulted mercury emission outflow were
investigated. The total annual mercury deposition in the region was
estimated to be 821 Mg, with 396 Mg contributed by wet deposition and 425 Mg
by dry deposition. Anthropogenic emissions were responsible for most of the
estimated deposition (75%). The deposition caused by emissions from
natural sources was less important (25%). Regional mercury transport
budgets showed strong seasonal variability, with a net removal of RGM
(7–15 Mg month−1) and PHg (13–21 Mg month−1) in the
domain, and a net export of GEM (60–130 Mg month−1) from the
domain. The outflow caused by East Asian emissions (anthropogenic plus
natural) was estimated to be in the range of 1369–1671 Mg yr−1,
of which 50–60% was caused by emissions from natural sources. The
emission outflow represented about 75% of the total mercury emissions in
the region, and would contribute to 20–30% of mercury deposition in
remote receptors. |
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