 |
| Titel |
Aerosol particle measurements at three stationary sites in the megacity of Paris during summer 2009: meteorology and air mass origin dominate aerosol particle composition and size distribution |
| VerfasserIn |
F. Freutel, J. Schneider, F. Drewnick, S.-L. Weiden-Reinmüller, M. Crippa, A. S. H. Prévôt, U. Baltensperger, L. Poulain, A. Wiedensohler, J. Sciare, R. Sarda-Estève, J. F. Burkhart, S. Eckhardt, A. Stohl, V. Gros, A. Colomb, V. Michoud, J. F. Doussin, A. Borbon, M. Haeffelin, Y. Morille, M. Beekmann, S. Borrmann |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 13, no. 2 ; Nr. 13, no. 2 (2013-01-23), S.933-959 |
| Datensatznummer |
250017609
|
| Publikation (Nr.) |
 copernicus.org/acp-13-933-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
| During July 2009, a one-month measurement campaign was performed in the
megacity of Paris. Amongst other measurement platforms, three stationary
sites distributed over an area of 40 km in diameter in the greater Paris
region enabled a detailed characterization of the aerosol particle and gas
phase. Simulation results from the FLEXPART dispersion model were used to
distinguish between different types of air masses sampled. It was found that
the origin of air masses had a large influence on measured mass
concentrations of the secondary species particulate sulphate, nitrate,
ammonium, and oxygenated organic aerosol measured with the Aerodyne aerosol
mass spectrometer in the submicron particle size range: particularly high
concentrations of these species (about 4 μg m−3, 2 μg m−3,
2 μg m−3, and 7 μg m−3,
respectively) were measured when aged material was advected from continental
Europe, while for air masses originating from the Atlantic, much lower mass
concentrations of these species were observed (about 1 μg m−3, 0.2 μg m−3, 0.4 μg m−3, and
1–3 μg m−3, respectively). For the primary emission
tracers hydrocarbon-like organic aerosol, black carbon, and NOx it was
found that apart from diurnal source strength variations and proximity to
emission sources, local meteorology had the largest influence on measured
concentrations, with higher wind speeds leading to larger dilution and
therefore smaller measured concentrations. Also the shape of particle size
distributions was affected by wind speed and air mass origin.
Quasi-Lagrangian measurements performed under connected flow conditions
between the three stationary sites were used to estimate the influence of
the Paris emission plume onto its surroundings, which was found to be rather
small. Rough estimates for the impact of the Paris emission plume on the
suburban areas can be inferred from these measurements: Volume mixing ratios
of 1–14 ppb of NOx, and upper limits for mass concentrations of
about 1.5 μg m−3 of black carbon and of about 3 μg m−3 of hydrocarbon-like organic aerosol can be deduced which
originate from both, local emissions and the overall Paris emission plume.
The secondary aerosol particle phase species were found to be not
significantly influenced by the Paris megacity, indicating their regional
origin. The submicron aerosol mass concentrations of particulate sulphate,
nitrate, and ammonium measured during time periods when air masses were
advected from eastern central Europe were found to be similar to what has
been found from other measurement campaigns in Paris and south-central
France for this type of air mass origin, indicating that the results
presented here are also more generally valid. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|