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| Titel |
Projections of atmospheric mercury levels and their effect on air quality in the United States |
| VerfasserIn |
H. Lei, D. J. Wuebbles, X.-Z. Liang, Z. Tao, S. Olsen, R. Artz, X. Ren, M. Cohen |
| 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. 2 ; Nr. 14, no. 2 (2014-01-23), S.783-795 |
| Datensatznummer |
250118305
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| Publikation (Nr.) |
 copernicus.org/acp-14-783-2014.pdf |
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| Zusammenfassung |
| The individual and combined effects of global climate
change and emissions changes from 2000 to 2050 on atmospheric mercury levels
in the United States are investigated by using the global climate-chemistry
model, CAM-Chem, coupled with a mercury chemistry-physics mechanism
(CAM-Chem/Hg). Three future pathways from the Intergovernmental Panel on
Climate Change (IPCC) Special Report on Emissions Scenarios (SRES) are
considered, with the A1FI, A1B and B1 scenarios representing the upper,
middle and lower bounds of potential climate warming, respectively. The
anthropogenic and biomass burning emissions of mercury are projected from
the energy use assumptions in the IPCC SRES report. Natural emissions from
both land and ocean sources are projected by using dynamic schemes. TGM
concentration increases are greater in the low latitudes than they are in
the high latitudes, indicative of a larger meridional gradient than in the
present day. In the A1FI scenario, TGM concentrations in 2050 are projected
to increase by 2.1–4.0 ng m−3 for the eastern US and 1.4–3.0 ng m−3
for the western US. This spatial difference corresponds to
potential increases in wet deposition of 10–14 μg m−2 for the
eastern US and 2–4 μg m−2 for the western US. The increase
in Hg(II) emissions tends to enhance wet deposition and hence increase the
risk of higher mercury entering the hydrological cycle and ecosystem. In the
B1 scenario, mercury concentrations in 2050 are similar to present level
concentrations; this finding indicates that the domestic reduction in
mercury emissions is essentially counteracted by the effects of climate
warming and emissions increases in other regions. The sensitivity analyses
show that changes in anthropogenic emissions contribute 32–53% of
projected changes in mercury air concentration, while the independent
contribution by climate change and its induced natural emissions change
accounts for 47–68%. |
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