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| Titel |
In situ formation and spatial variability of particle number concentration in a European megacity |
| VerfasserIn |
M. Pikridas, J. Sciare, F. Freutel, S. Crumeyrolle, S.-L. von der Weiden-Reinmüller, A. Borbon, A. Schwarzenboeck, M. Merkel, M. Crippa, E. Kostenidou, M. Psichoudaki, L. Hildebrandt, G. J. Engelhart, T. Petäjä, A. S. H. Prévôt, F. Drewnick, U. Baltensperger, A. Wiedensohler, M. Kulmala  , M. Beekmann, S. N. Pandis |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 15, no. 17 ; Nr. 15, no. 17 (2015-09-15), S.10219-10237 |
| Datensatznummer |
250120032
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| Publikation (Nr.) |
 copernicus.org/acp-15-10219-2015.pdf |
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| Zusammenfassung |
| Ambient particle number size distributions were measured in Paris, France,
during summer (1–31 July 2009) and winter (15 January to 15 February 2010)
at three fixed ground sites and using two mobile laboratories and one
airplane. The campaigns were part of the Megacities: Emissions, urban,
regional and Global Atmospheric POLlution and climate effects, and Integrated
tools for assessment and mitigation (MEGAPOLI) project. New particle formation (NPF) was observed only
during summer on approximately 50 % of the campaign days, assisted by the
low condensation sink (about
10.7 ± 5.9 × 10−3 s−1). NPF events inside the Paris
plume were also observed at 600 m altitude onboard an aircraft
simultaneously with regional events identified on the ground. Increased
particle number concentrations were measured aloft also outside of the Paris
plume at the same altitude, and were attributed to NPF. The Paris plume was
identified, based on increased particle number and black carbon
concentration, up to 200 km away from the Paris center during summer. The
number concentration of particles with diameters exceeding 2.5 nm measured
on the surface at the Paris center was on average
6.9 ± 8.7 × 104 and
12.1 ± 8.6 × 104 cm−3 during summer and winter,
respectively, and was found to decrease exponentially with distance from
Paris. However, further than 30 km from the city center, the particle number
concentration at the surface was similar during both campaigns. During
summer, one suburban site in the NE was not significantly affected by Paris
emissions due to higher background number concentrations, while the particle
number concentration at the second suburban site in the SW increased by a
factor of 3 when it was downwind of Paris. |
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