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| Titel |
Air quality modelling over the Eastern Mediterranean using the WRF/Chem model: Comparison of gas-phase chemistry and aerosol mechanisms |
| VerfasserIn |
George K. Georgiou, Theodoros Christoudias, Yiannis Proestos, Jonilda Kushta, Panos Hadjinicolaou, Jos Lelieveld  |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250144108
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| Publikation (Nr.) |
 EGU/EGU2017-7894.pdf |
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| Zusammenfassung |
| A comprehensive analysis of the performance of three coupled gas-phase chemistry and
aerosol mechanisms included in the WRF/Chem model has been performed over the Eastern
Mediterranean focusing on Cyprus during the CYPHEX campaign in 2014, using high
temporal and spatial resolution. The model performance was evaluated by comparing
calculations to measurements of gas phase species (O3, CO, NOx, SO2) and aerosols
(PM10, PM2.5) from 13 ground stations. Initial results indicate that the calculated
day-to-day and diurnal variations of the aforementioned species show good agreement with
observations.
The model was set up with three nested grids, downscaling to 4km over Cyprus. The
meteorological boundary conditions were updated every 3 hours throughout the simulation
using the Global Forecast System (GFS), while chemical boundary conditions were updated
every 6 hours using the MOZART global chemical transport model. Biogenic emissions were
calculated online by the the Model of Emissions of Gases and Aerosols from Nature version
2.1 (MEGAN2.1). Anthropogenic emissions were based on the EDGAR HTAP v2 global
emission inventory, provided on a horizontal grid resolution of 0.1o × 0.1o. Three simulations
were performed employing different chemistry and aerosol mechanisms; i) RADM2 chemical
mechanism and MADE/SORGAM aerosols, ii) CBMZ chemical mechanism and
MOSAIC aerosols, iii) MOZART chemical mechanism and MOSAIC aerosols.
Results show that the WRF/Chem model satisfactorily estimates the trace gases
relative concentrations at the background sites but not at the urban and traffic sites,
while some differences appear between the simulated concentrations by the three
mechanisms.
The resulting discrepancies between the model outcome and measurements,
especially at the urban and traffic sites, suggest that a higher resolution anthropogenic
emission inventory might help improve fine resolution, regional air quality modelling.
Differences in the simulated concentrations by the three chemical mechanisms
are attributed to the different chemical species and reaction rate constants used. |
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