Atmospheric Chemistry and Physics Discussions
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10.5194/acpd-7-9053-2007
http://www.atmos-chem-phys-discuss.net/7/9053/2007/
http://www.atmos-chem-phys-discuss.net/7/9053/2007/acpd-7-9053-2007.html
http://www.atmos-chem-phys-discuss.net/7/9053/2007/acpd-7-9053-2007.pdf
9053
9092
2007-06-26
Secondary organic aerosol in the global aerosol – chemistry transport model Oslo CTM2
C. R. Hoyle
c.r.hoyle@geo.uio.no
T. Berntsen
G. Myhre
I. S. A. Isaksen
Department of Geosciences, University of Oslo, Norway
The global chemical transport model Oslo CTM2 has been extended to include
the formation, transport and deposition of secondary organic aerosol (SOA).
Precursor hydrocarbons which are oxidised to form condensible species include
both biogenic species such as terpenes and isoprene, as well as species
emitted predominantly by anthropogenic activities (toluene, m-xylene,
methylbenzene and other aromatics). A model simulation for 2004 gives an
annual global SOA production of approximately 55 Tg. Of this total,
2.5 Tg is found to consist of the oxidation products of
anthropogenically emitted hydrocarbons, and about 15 Tg is formed by the
oxidation products of isoprene. The global production of SOA is increased to
about 76 Tg yr<sup>−1</sup> by allowing semi-volatile species to
condense on ammonium sulphate aerosol. This brings modelled organic aerosol
values closer to those observed, however observations in Europe remain
significantly underestimated, raising the possibility of an unaccounted for
SOA source. Allowing SOA to form on ammonium sulphate aerosol increases the
contribution of anthropogenic SOA from about 4.5% to almost 9% of the total
production.
The importance of NO<sub>3</sub> as an oxidant of SOA precursors is found to vary
regionally, causing up to 50%–60% of the total amount of SOA near the surface
in polluted regions and less than 25% in more remote areas.
This study underscores the need for SOA to be represented in a more realistic
way in global aerosol models in order to better reproduce observations of
organic aerosol burdens in industrialised and biomass burning regions.
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