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| Titel |
ORACLE (v1.0): module to simulate the organic aerosol composition and evolution in the atmosphere |
| VerfasserIn |
A. P. Tsimpidi, V. A. Karydis, A. Pozzer, S. N. Pandis, J. Lelieveld  |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 7, no. 6 ; Nr. 7, no. 6 (2014-12-21), S.3153-3172 |
| Datensatznummer |
250115804
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| Publikation (Nr.) |
 copernicus.org/gmd-7-3153-2014.pdf |
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| Zusammenfassung |
| A computationally efficient module to describe organic aerosol (OA)
partitioning and chemical aging has been developed and implemented into the
EMAC atmospheric chemistry–climate model. The model simulates the formation
of secondary organic aerosol (SOA) from semivolatile (SVOCs),
intermediate-volatility (IVOCs), and volatile organic compounds (VOCs). It
distinguishes SVOCs from biomass burning and all other combustion sources
using two surrogate species for each source category with an effective
saturation concentration at 298 K of C* = 0.1 and 10 μg m−3. Two additional surrogate species with C* = 103
and 105 μg m−3 are used for the IVOCs emitted by the
above source categories. Gas-phase photochemical reactions that change the
volatility of the organics are taken into account. The oxidation products
(SOA-sv, SOA-iv, and SOA-v) of each group of precursors (SVOCs, IVOCs, and
VOCs) are simulated separately to keep track of their origin. ORACLE
efficiently describes the OA composition and evolution in the atmosphere and
can be used to (i) estimate the relative contributions of SOA and primary
organic aerosol (POA) to total OA, (ii) determine how SOA concentrations are
affected by biogenic and anthropogenic emissions, and (iii) evaluate the
effects of photochemical aging and long-range transport on the OA budget. We
estimate that the global average near-surface OA concentration is 1.5 μg m−3
and consists of 7% POA from fuel combustion, 11% POA
from biomass burning, 2% SOA-sv from fuel combustion, 3% SOA-sv from
biomass burning, 15% SOA-iv from fuel combustion, 28% SOA-iv from
biomass burning, 19% biogenic SOA-v, and 15% anthropogenic SOA-v. The
modeled tropospheric burden of OA components is 0.23 Tg POA, 0.16 Tg SOA-sv,
1.41 Tg SOA-iv, and 1.2 Tg SOA-v. |
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