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| Titel |
Size distribution of EC and OC in the aerosol of Alpine valleys during summer and winter |
| VerfasserIn |
J.-L. Jaffrezo, G. Aymoz, J. Cozic |
| 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 ; 5, no. 11 ; Nr. 5, no. 11 (2005-11-02), S.2915-2925 |
| Datensatznummer |
250003137
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| Publikation (Nr.) |
 copernicus.org/acp-5-2915-2005.pdf |
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| Zusammenfassung |
| Collections of samples were conducted for the determination of the size
distributions of EC and OC during the intensive sampling campaigns of the
POVA program, in two Alpine valleys of the French Alps, in summer and in
winter. The comparison of concentrations obtained for samples collected in
parallel with impactor- and filter-based methods is rather positive with
slopes of 0.95 and 0.76 for OC and EC, respectively and correlations close
to 1 (0.92 and 0.90 for OC and EC, respectively, n=26). This is an
indication that the correction of pyrolysis seems to work for the impactor
samples despite non even deposits. The size distributions of the
concentrations of EC and OC present large evolutions between winter and
summer, and between a suburban and a rural site. In winter, an overwhelming
proportion of the mass fraction of both species is found in the droplet and
accumulation modes, often (but not always) in association with sulfate and
other chemical species resulting from secondary formation processes. Some
indications of gas/particles exchanges can be found for the other parts of
the size spectrum (the Aitken and super micron modes) in the case of the
rural site. In summer, the changes are more drastic with, according to the
case, a dominant droplet or accumulation mode. Particularly at the rural
site, the large extent of processing of the aerosol due to gas/particles
exchanges is evident for the Aitken and super micron modes, with increasing
of the OC mass fractions in these size ranges. All of these observations
give indications on the degree of internal vs. external mixing of the
species investigated in the different modes. |
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