Hygroscopicity of aerosol particles at low temperatures. 1. New low-temperature H-TDMA instrument.  setup and first applications

dc.contributor.authorWeingartner, Ernest
dc.contributor.authorGysel, Martin
dc.contributor.authorBaltensperger, Urs
dc.date.accessioned2024-08-19T14:10:00Z
dc.date.available2024-08-19T14:10:00Z
dc.date.issued2001-11-22
dc.description.abstractA hygroscopicity tandem differential mobility analyzer (H-TDMA) is described that allows a fast and accurate determination of the water uptake by submicrometer aerosol particles at temperatures below 0 °C. To avoid volatilization of semivolatile particles, the humidification works without heating the gas stream, and the gas-phase composition is not changed during the analysis. The applied scanning mobility analysis allows a fast and accurate measurement of the humidogram, but care has to be taken with too high scanning velocities leading to artifacts in the particle size measurement. During a field campaign at a high-alpine site (Jungfraujoch, 3580 m above sea level), humidograms of free tropospheric particles were measured at T = −10 °C. The hygroscopic growth of these particles was characterized by monomodal growth distributions, which means that in the observed size range (dry particle diameters (Do) = 50−250 nm) the free tropospheric aerosol was to a large extent internally mixed. No distinct deliquescence was observed, indicating that the multicomponent aerosol particles are present in a liquid state even at a low relative humidity (RH) <10%. At RH 85%, average hygroscopic growth factors of 1.44, 1.49, and 1.53 were measured for Do = 50, 100, and 250 nm. The estimated soluble volume fraction of the particles in the observed size range was found to be 0.79, 0.86, and 0.91, respectively.
dc.identifier.doi10.1021/es010054o
dc.identifier.issn0013-936X
dc.identifier.issn1520-5851
dc.identifier.urihttps://irf.fhnw.ch/handle/11654/46829
dc.issue1
dc.language.isoen
dc.publisherAmerican Chemical Society
dc.relation.ispartofEnvironmental Science & Technology
dc.spatialWashington, D.C.
dc.subject.ddc550 - Geowissenschaften
dc.titleHygroscopicity of aerosol particles at low temperatures. 1. New low-temperature H-TDMA instrument.  setup and first applications
dc.type01A - Beitrag in wissenschaftlicher Zeitschrift
dc.volume36
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.pagination55-62
fhnw.publicationStatePublished
relation.isAuthorOfPublication05dd9a19-7a24-4325-805a-2d121483b168
relation.isAuthorOfPublication.latestForDiscovery05dd9a19-7a24-4325-805a-2d121483b168
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