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| Titel |
Predicting the vertical distribution of particle number concentration using the 3-D regional CTM PMCAMx-UF: relevance of high altitude nucleation and transport and cloud properties |
| VerfasserIn |
Elham Baranizadeh, Benjamin Murphy, Lars Ahlm, Christos Fountoukis, Spyros Pandis, Annele Virtanen, Kari Lehtinen, Ari Laaksonen, Ilona Riipinen |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250110923
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| Publikation (Nr.) |
 EGU/EGU2015-10968.pdf |
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| Zusammenfassung |
| The three-dimensional chemical transport model PMCAMx-UF was used to predict the
aerosol number concentrations (N) over the Europe domain during May 2008. We
implemented the more sophisticated approach called Tropospheric Ultra-Violet and Visible
(TUV) radiative transfer model (NCAR, 2011) to treat the cloud effect on photolysis rates.
The changes in Sulfuric Acid and particles number concentrations anticorrelate at the ground
level (and below clouds) while correlate above clouds. This is because updated version of the
model including TUV module simulates higher radiation above the clouds resulting in
stronger new particle formation in higher altitudes which are eventually transported to lower
levels. For example, mean-percent-differences are 9 and -41 % in N3 and H2SO4,
respectively, below clouds (cloudy regions with cloud optical depth Ï >50 was
chosen) and 12 and 210 % above cloud at May 5, 2008 12:00 UTC. The vertical
profiles of particle number concentrations were evaluated against the measured
data from EUCAARI-LONGREX campaign. Results indicate that the model is
slightly overestimating the particles in nucleation mode range over the ground-level
altitudes. However, the model shows a significant agreement with the measurements
for the N4 (i.e. particles larger than 4 nm) and also N10 over all altitude levels. |
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