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| Titel |
Simulation of aerosol chemical compositions in the Western Mediterranean Sea |
| VerfasserIn |
Mounir Chrit, Karine Kata Sartelet, Jean Sciare, Nicolas Marchand, Jorge Pey, Karine Sellegri |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250128836
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| Publikation (Nr.) |
 EGU/EGU2016-8866.pdf |
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| Zusammenfassung |
| This work aims at evaluating the chemical transport model (CTM) Polair3d of the air-quality
modelling platform Polyphemus during the ChArMex summer campaigns of 2013, using
ground-based measurements performed at ERSA (Cape Corsica, France), and at determining
the processes controlling organic aerosol concentrations at ERSA. Simulations are compared
to measurements for concentrations of both organic and inorganic species, as well as the ratio
of biogenic versus anthropogenic particles, and organic aerosol properties (oxidation
state).
For inorganics, the concentrations of sulphate, sodium, chloride, ammonium and nitrate
are compared to measurements. Non-sea-salt sulphate and ammonium concentrations are
well reproduced by the model. However, because of the geographic location of
the measurement station at Cape Corsica which undergoes strong wind velocities
and sea effects, sea-salt sulphate, sodium, chloride and nitrate concentrations are
strongly influenced by the parameterizations used for sea-salt emissions. Different
parameterizations are compared and a parameterization is chosen after comparison to sodium
measurements.
For organics, the concentrations are well modelled when compared to experimental
values. Anthropogenic particles are influenced by emission of semi-volatile organic
compounds (SVOC). Measurements allow us to refine the estimation of those emissions,
which are currently missing in emission inventories. Although concentrations of biogenic
particles are well simulated, the organic chemical compounds are not enough oxidised in the
model. The observed oxidation state of organics shows that the oligomerisation of
pinonaldehyde was over-estimated in Polyphemus. To improve the oxidation property of
organics, the formation of extremely low volatile organic compounds from autoxidation of
monoterpenes is added to Polyphemus, using recently published data from chamber
experiments. These chemical compounds are highly oxygenated and are formed rapidly, as
first-generation products. |
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