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| Titel |
Effects of changing gaseous precursor emissions on aerosol chemical composition in Europe |
| VerfasserIn |
C. Knote, D. Brunner |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250069978
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| Zusammenfassung |
| In the last two decades, emissions of air pollutants and their gaseous precursors have changed
dramatically in Europe. Besides the strong reductions in SO2, also NOx and V OC emission
amounts were considerably reduced in a number of countries. Aerosols are intimately
connected to the gas-phase for both its inorganic and organic components. The effects of
changing emissions on sulfate aerosols as observed by long-term EMEP wet deposition
measurements is clearly visibly, with strongly reduced concentrations at almost
all stations. Reactions of nitrate aerosols on the changes in NOx are less clear,
where decreases, no change, and even increases are observed. Several hypotheses
have been proposed to explain these findings, but no comprehensive study has been
made to investigate the relative contributions of each hypothesis to the changes
observed.
In our work we present a modeling study with the fully online-coupled regional
chemistry-climate model COSMO-ART (Vogel et al., 2009), which considers both gas-phase
and aerosol processes. We conducted simulations with emissions of 1990 and 2009
for the domain of Europe for selected periods, and additionally made sensitivity
studies to assess the influence of the changes in selected precursors on the different
aerosol components. We show that reactions to changes in precursor emissions are
spatially variable and especially for strongly polluted regions quite unexpected. |
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