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| Titel |
Impacts of future climate change and effects of biogenic emissions on surface ozone and particulate matter concentrations in the United States |
| VerfasserIn |
Y. F. Lam, J. S. Fu, S. Wu, L. J. Mickley |
| 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 ; 11, no. 10 ; Nr. 11, no. 10 (2011-05-23), S.4789-4806 |
| Datensatznummer |
250009757
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| Publikation (Nr.) |
 copernicus.org/acp-11-4789-2011.pdf |
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| Zusammenfassung |
| Simulations of present and future average regional ozone and PM2.5
concentrations over the United States were performed to investigate the
potential impacts of global climate change and emissions on regional air
quality using CMAQ. Various emissions and climate conditions with different
biogenic emissions and domain resolutions were implemented to study the
sensitivity of future air quality trends from the impacts of changing
biogenic emissions. A comparison of GEOS-Chem and CMAQ was performed to
investigate the effect of downscaling on the prediction of future air
quality trends. For ozone, the impacts of global climate change are
relatively smaller when compared to the impacts of anticipated future
emissions reduction, except for the Northeast area, where increasing
biogenic emissions due to climate change have stronger positive effects
(increases) to the regional ozone air quality. The combination effect from
both climate change and emission reductions leads to approximately a 10 %
or 5 ppbv decrease of the maximum daily average eight-hour ozone (MDA8) over
the Eastern United States. For PM2.5, the impacts of global climate
change have shown insignificant effect, where as the impacts of anticipated
future emissions reduction account for the majority of overall PM2.5
reductions. The annual average 24-h PM2.5 of the future-year condition
was found to be about 40 % lower than the one from the present-year
condition, of which 60 % of its overall reductions are contributed to by
the decrease of SO4 and NO3 particulate matters. Changing the
biogenic emissions model increases the MDA8 ozone by about 5–10 % or
3–5 ppbv in the Northeast area. Conversely, it reduces the annual average
PM2.5 by 5 % or 1.0 μg m−3 in the Southeast region. |
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