Atmospheric Chemistry and Physics Discussions
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10.5194/acpd-8-18911-2008
http://www.atmos-chem-phys-discuss.net/8/18911/2008/
http://www.atmos-chem-phys-discuss.net/8/18911/2008/acpd-8-18911-2008.html
http://www.atmos-chem-phys-discuss.net/8/18911/2008/acpd-8-18911-2008.pdf
18911
18936
2008-11-03
Anthropogenic influence on SOA and the resulting radiative forcing
C. R. Hoyle
c.r.hoyle@geo.uio.no
G. Myhre
T. K. Berntsen
I. S. A. Isaksen
Department of Geosciences, University of Oslo, Norway
Center for International Climate and Environmental Research, Oslo, Norway
Institute for Atmospheric and Climate Science, ETH Zurich, Zurich, Switzerland
The pre-industrial and present day distributions and burdens of Secondary
Organic Aerosol (SOA) have been calculated using the off-line aerosol
chemistry transport model Oslo CTM2. The production of SOA was found to have
increased from about 43 Tg yr<sup>−1</sup> to 69 Tg yr<sup>−1</sup> since
pre-industrial times, leading to an increase in the global annual mean SOA
burden from 0.44 Tg to 0.70 Tg, or about 59%. The increases are greatest
over industrialised areas, 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 is caused by emissions of primary organic aerosols
(POA), from fossil fuel and bio fuel combustion. When SOA partitioning to
ammonium sulphate aerosol was not accounted for, the increase in SOA burden
between pre-industrial times and the present was found to be lower (51%),
with a production increase of 55%. 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 find that the change in SOA burden caused a
radiative forcing of −0.09 W m<sup>−2</sup>, when SOA was allowed to partition
to both organic and sulphate aerosols, and −0.06 W m<sup>−2</sup> when only
partitioning to organic aerosols was assumed. Therefore, the radiative
forcing of SOA is found to be substantially stronger than the best estimate
for POA in the latest IPCC assessment.
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