The background aerosol size distribution in the free troposphere. An analysis of the annual cycle at a high‐alpine site

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Authors
Nyeki, Stephan
Li, F.
Streit, Niklaus
Colbeck, Ian
Gäggeler, Heinz W.
Baltensperger, Urs
Author (Corporation)
Publication date
01.12.1998
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01A - Journal article
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Parent work
Journal of Geophysical Research: Atmospheres
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DOI of the original publication
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Volume
103
Issue / Number
D24
Pages / Duration
31749-31761
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Publisher / Publishing institution
Wiley
Place of publication / Event location
Hoboken
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Abstract
Measurements during free tropospheric (FT) and planetary boundary layer (PBL) conditions were conducted over an annual cycle at the Jungfraujoch high-Alpine research station (3454 m), Switzerland, in order to establish diurnal and seasonal cycles of the background continental aerosol over central Europe. Using a condensation nucleus counter (TSI 3025) and an optical particle counter (PMS Las-X) from June 1996 to May 1997, the following were determined: (1) accumulation mode lognormal parameters and (2) number concentrations for the nucleation (diameter d < 0.1 μm), accumulation (0.1 ≤ d ≤ 1.0 μm), and part of the coarse (1.0 < d ≤ 7.5 μm, designated “coarse”) modes. Lognormal parameters were found to be similar for FT and PBL conditions, and exhibited a weak seasonality in geometric median diameter dGN =0.13 and 0.10 μm, and standard deviation σG = 1.73 and 1.64 for summer and winter, respectively. Aerosol number concentrations in each mode exhibited a more pronounced seasonality, with FT concentrations being lower than those for PBL. Summer and winter FT median concentrations for the nucleation, accumulation, and “coarse” modes were 405 and 195 cmˉ³, 114 and 26 cmˉ³, and 0.052 and 0.014 cmˉ³, respectively. These results provide tentative support of other long-term observations that the FT background aerosol mode appears to vary mainly in concentration rather than accumulation mode shape. Further analysis indicated that only the total concentration in each mode varied with weather type and a classification between that of a remote continental and polar aerosol model was found for the Jungfraujoch.
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550 - Geowissenschaften
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2169-897X
2169-8996
Language
English
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No
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Published
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Peer review of the complete publication
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Closed
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Citation
NYEKI, Stephan, F. LI, Ernest WEINGARTNER, Niklaus STREIT, Ian COLBECK, Heinz W. GÄGGELER und Urs BALTENSPERGER, 1998. The background aerosol size distribution in the free troposphere. An analysis of the annual cycle at a high‐alpine site. Journal of Geophysical Research: Atmospheres. 1 Dezember 1998. Bd. 103, Nr. D24, S. 31749–31761. DOI 10.1029/1998jd200029. Verfügbar unter: https://irf.fhnw.ch/handle/11654/46897