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| Titel |
Anthropogenic influence on SOA and the resulting radiative forcing |
| VerfasserIn |
C. R. Hoyle, G. Myhre, T. K. Berntsen, I. S. A. Isaksen |
| 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 ; 9, no. 8 ; Nr. 9, no. 8 (2009-04-23), S.2715-2728 |
| Datensatznummer |
250007208
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| Publikation (Nr.) |
 copernicus.org/acp-9-2715-2009.pdf |
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| Zusammenfassung |
| The effect of chemical changes in the atmosphere since the pre-industrial
period on the distributions and burdens of Secondary Organic Aerosol (SOA)
has been calculated using the off-line aerosol chemistry transport model
Oslo CTM2. The production of SOA was found to have increased from about
35 Tg yr−1 to 53 Tg yr−1 since pre-industrial times, leading
to an increase in the global annual mean SOA burden from 0.33 Tg to 0.50 Tg,
or about 51%. The effect of allowing semi-volatile species to partition to
sulphate aerosol was also tested, leading to an increase in SOA production
from about 43 Tg yr−1 to 69 Tg yr−1 since pre-industrial times,
while the annual mean SOA burden increased from 0.44 Tg to 0.70 Tg, or about
59%. The increases were greatest over industrialised areas, especially when
partitioning to sulphate aerosol was allowed, as well as over regions with
high biogenic precursor emissions. The contribution of emissions from different
sources to the larger SOA burdens has been calculated. The results suggest that
the majority of the increase was caused by emissions of primary organic aerosols
(POA), from fossil fuel and bio fuel combustion. As yet, very few radiative
forcing estimates of SOA exist, and no such estimates were provided in the latest
IPCC report. In this study, we found that the change in SOA burden caused a
radiative forcing (defined here as the difference between the pre-industrial
and the present day run) of −0.09 W m−2, when SOA was allowed to
partition to both organic and sulphate aerosols, and −0.06 W m−2
when only partitioning to organic aerosols was assumed. Therefore, the
radiative forcing of SOA was found to be stronger than the best estimate
for POA in the latest IPCC assessment. |
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