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

dc.contributor.authorNyeki, Stephan
dc.contributor.authorLi, F.
dc.contributor.authorWeingartner, Ernest
dc.contributor.authorStreit, Niklaus
dc.contributor.authorColbeck, Ian
dc.contributor.authorGäggeler, Heinz W.
dc.contributor.authorBaltensperger, Urs
dc.date.accessioned2024-08-21T08:31:33Z
dc.date.available2024-08-21T08:31:33Z
dc.date.issued1998-12-01
dc.description.abstractMeasurements 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.
dc.identifier.doi10.1029/1998jd200029
dc.identifier.issn2169-897X
dc.identifier.issn2169-8996
dc.identifier.urihttps://irf.fhnw.ch/handle/11654/46897
dc.issueD24
dc.language.isoen
dc.publisherWiley
dc.relation.ispartofJournal of Geophysical Research: Atmospheres
dc.spatialHoboken
dc.subject.ddc550 - Geowissenschaften
dc.titleThe background aerosol size distribution in the free troposphere. An analysis of the annual cycle at a high‐alpine site
dc.type01A - Beitrag in wissenschaftlicher Zeitschrift
dc.volume103
dspace.entity.typePublication
fhnw.InventedHereNo
fhnw.ReviewTypeAnonymous ex ante peer review of a complete publication
fhnw.affiliation.hochschuleHochschule für Technikde_CH
fhnw.affiliation.institutlnstitut für Sensorik und Elektronikde_CH
fhnw.openAccessCategoryClosed
fhnw.pagination31749-31761
fhnw.publicationStatePublished
relation.isAuthorOfPublication05dd9a19-7a24-4325-805a-2d121483b168
relation.isAuthorOfPublication.latestForDiscovery05dd9a19-7a24-4325-805a-2d121483b168
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