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| Titel |
Air quality and radiative forcing impacts of anthropogenic volatile organic compound emissions from ten world regions |
| VerfasserIn |
M. M. Fry, M. D. Schwarzkopf, Z. Adelman, J. J. West |
| 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 (2014-01-16), S.523-535 |
| Datensatznummer |
250118289
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| Publikation (Nr.) |
 copernicus.org/acp-14-523-2014.pdf |
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| Zusammenfassung |
| Non-methane volatile organic compounds (NMVOCs) influence air quality and
global climate change through their effects on secondary air pollutants and
climate forcers. Here we simulate the air quality and radiative forcing (RF)
impacts of changes in ozone, methane, and sulfate from halving anthropogenic
NMVOC emissions globally and from 10 regions individually, using a global
chemical transport model and a standalone radiative transfer model. Halving
global NMVOC emissions decreases global annual average tropospheric methane
and ozone by 36.6 ppbv and 3.3 Tg, respectively, and surface ozone by
0.67 ppbv. All regional reductions slow the production of
peroxyacetyl nitrate (PAN),
resulting in regional to intercontinental PAN decreases and regional
NOx increases. These NOx increases drive tropospheric
ozone increases nearby or downwind of source regions in the Southern
Hemisphere (South America, Southeast Asia, Africa, and Australia). Some
regions' NMVOC emissions contribute importantly to air pollution in other
regions, such as East Asia, the Middle East, and Europe, whose impact on US
surface ozone is 43%, 34%, and 34% of North America's impact. Global
and regional NMVOC reductions produce widespread negative net RFs (cooling)
across both hemispheres from tropospheric ozone and methane decreases, and
regional warming and cooling from changes in tropospheric ozone and sulfate
(via several oxidation pathways). The 100 yr and 20 yr global warming
potentials (GWP100, GWP20) are 2.36 and 5.83 for the global
reduction, and 0.079 to 6.05 and −1.13 to 18.9 among the 10 regions. The
NMVOC RF and GWP estimates are generally lower than previously modeled
estimates, due to the greater NMVOC/NOx emissions ratios
simulated, which result in less sensitivity to NMVOC emissions changes and
smaller global O3 burden responses, in addition to differences in the
representation of NMVOCs and oxidation chemistry among models. Accounting for
a fuller set of RF contributions may change the relative magnitude of each
region's impacts. The large variability in the RF and GWP of NMVOCs among
regions suggest that regionally specific metrics may be necessary to include
NMVOCs in multi-gas climate trading schemes. |
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