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| Titel |
Chemical composition of free tropospheric aerosol for PM1 and coarse mode at the high alpine site Jungfraujoch |
| VerfasserIn |
J. Cozic, B. Verheggen, E. Weingärtner, J. Crosier, K. N. Bower, M. Flynn, H. Coe, S. Henning, M. Steinbacher, S. Henne, M. Collaud Coen, A. Petzold, U. Baltensperger |
| 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 ; 8, no. 2 ; Nr. 8, no. 2 (2008-01-31), S.407-423 |
| Datensatznummer |
250005434
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| Publikation (Nr.) |
 copernicus.org/acp-8-407-2008.pdf |
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| Zusammenfassung |
| The chemical composition of submicron (fine mode) and supermicron (coarse
mode) aerosol particles has been investigated at the Jungfraujoch high
alpine research station (3580 m a.s.l., Switzerland) as part of the GAW aerosol
monitoring program since 1999. A clear seasonality was observed for all
major components throughout the period with low concentrations in winter
(predominantly free tropospheric aerosol) and higher concentrations in
summer (enhanced vertical transport of boundary layer pollutants). In
addition, mass closure was attempted during intensive campaigns in March
2004, February–March 2005 and August 2005. Ionic, carbonaceous and
non-refractory components of the aerosol were quantified as well as the PM1 and
coarse mode total aerosol mass concentrations. A relatively low conversion
factor of 1.8 for organic carbon (OC) to particulate organic matter (OM) was
found in winter (February–March 2005). Organics, sulfate, ammonium, and
nitrate were the major components of the fine aerosol fraction that were
identified, while calcium and nitrate were the only two measured components
contributing to the coarse mode. The aerosol mass concentrations for fine
and coarse mode aerosol measured during the intensive campaigns were not
typical of the long-term seasonality due largely to dynamical differences.
Average fine and coarse mode concentrations during the intensive field
campaigns were 1.7 μg m−3 and 2.4 μg m−3 in winter and
2.5 μg m−3 and 2.0 μg m−3 in summer, respectively. The
mass balance of aerosols showed higher contributions of calcium and nitrate
in the coarse mode during Saharan dust events (SDE) than without SDE. |
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