Influence of particle chemical composition on the phase of cold clouds at a high‐alpine site in Switzerland

dc.contributor.authorTargino, Admir Créso
dc.contributor.authorCoe, Hugh
dc.contributor.authorCozic, Julie
dc.contributor.authorCrosier, Jonathan
dc.contributor.authorCrawford, Ian
dc.contributor.authorBower, Keith
dc.contributor.authorFlynn, Michael
dc.contributor.authorGallagher, Martin
dc.contributor.authorAllan, James
dc.contributor.authorVerheggen, Bart
dc.contributor.authorWeingartner, Ernest
dc.contributor.authorBaltensperger, Urs
dc.contributor.authorChoularton, Tom
dc.date.accessioned2024-08-13T10:19:37Z
dc.date.available2024-08-13T10:19:37Z
dc.date.issued2009-09-23
dc.description.abstractThis paper studies the influence of particle chemical composition on the phase of cold clouds observed during two intensive measurement periods of the Cloud and Aerosol Characterization Experiments conducted at the Jungfraujoch site (Switzerland). Cloud droplets and particles were sampled simultaneously using a suite of optical, chemical, and microphysical instruments connected downstream of a total inlet and an interstitial inlet. Sulphate and organic matter were the most abundant semivolatile species observed in the particulate phase during both campaigns. Periods of relatively large loadings of organic and inorganic species were also accompanied by enhancement of light‐absorbing aerosol concentrations. The cloud phase exhibited sharp transitions, alternating between highly glaciated and liquid phases over a few seconds within the same cloud event. It was also observed that conditions of elevated pollution were accompanied by an increase in occurrence of glaciated periods. The 24‐hour cloud event investigated on the 8 March 2004 was in the mixed phase for approximately 260 minutes, in the glaciated phase for approximately 64 minutes and in the liquid phase for the remainder of the time. On the 23 March 2004, another 24‐hour cloud event was captured in which the number of minutes as mixed‐phase and glaciated cloud were 196 and 31, respectively. The loadings of BC as well as organic and inorganic species were larger during the first period. The investigation was extended for the whole data set, and a statistical analysis was performed across the chemical data measured off the total inlet. The amount of organic and inorganic material found in liquid and glaciated clouds was statistically different, with organic and inorganic material as well as BC being enriched in glaciated conditions. The case studies and the statistical analysis together suggest an influence of the particle chemical composition on the cloud phase, which may be important in perturbing cloud microphysics in polluted regions.
dc.identifier.doi10.1029/2008jd011365
dc.identifier.issn2169-8996
dc.identifier.issn2169-897X
dc.identifier.urihttps://irf.fhnw.ch/handle/11654/46662
dc.issueD18
dc.language.isoen
dc.publisherWiley
dc.relation.ispartofJournal of Geophysical Research: Atmospheres
dc.spatialHoboken
dc.subject.ddc550 - Geowissenschaften
dc.titleInfluence of particle chemical composition on the phase of cold clouds at a high‐alpine site in Switzerland
dc.type01A - Beitrag in wissenschaftlicher Zeitschrift
dc.volume114
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.publicationStatePublished
relation.isAuthorOfPublication05dd9a19-7a24-4325-805a-2d121483b168
relation.isAuthorOfPublication.latestForDiscovery05dd9a19-7a24-4325-805a-2d121483b168
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