Measurement of relative humidity dependent light scattering of aerosols

dc.contributor.authorFierz-Schmidhauser, Rahel
dc.contributor.authorZieger, Paul
dc.contributor.authorWehrle, Günther
dc.contributor.authorJefferson, Anne
dc.contributor.authorOgren, John A.
dc.contributor.authorBaltensperger, Urs
dc.contributor.authorWeingartner, Ernest
dc.date.accessioned2024-08-13T12:06:27Z
dc.date.available2024-08-13T12:06:27Z
dc.date.issued2010-01-21
dc.description.abstractRelative humidity (RH) influences the water content of aerosol particles and therefore has an important impact on the particles' ability to scatter visible light. The RH dependence of the particle light scattering coefficient (σsp is therefore an important measure for climate forcing calculations. We built a humidification system for a nephelometer which allows the measurement of σsp at a defined RH in the range of 40–90%. This RH conditioner consists of a humidifier followed by a dryer, which enables us to measure the hysteresis behavior of deliquescent aerosol particles. In this paper we present the set-up of a new humidified nephelometer, a detailed characterization with well defined laboratory generated aerosols, and a first application in the field by comparing our instrument to another humidified nephelometer. Monodisperse ammonium sulfate and sodium chloride particles were measured at four different dry particle sizes. Agreement between measurement and prediction based on Mie theory was found for both σsp and f(RH)=σsp(RH)/σsp(dry) within the range of uncertainty. The two humidified nephelometers measuring at a rural site in the Black Forest (Germany) often detected different f(RH), probably caused by the aerosol hysteresis behavior: when the aerosol was metastable, therefore was scattering more light, only one instrument detected the higher f(RH).
dc.identifier.doi10.5194/amt-3-39-2010
dc.identifier.issn1867-8548
dc.identifier.issn1867-1381
dc.identifier.urihttps://irf.fhnw.ch/handle/11654/46619
dc.identifier.urihttps://doi.org/10.26041/fhnw-9676
dc.issue1
dc.language.isoen
dc.publisherCopernicus
dc.relation.ispartofAtmospheric Measurement Techniques
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.spatialGöttingen
dc.subject.ddc550 - Geowissenschaften
dc.titleMeasurement of relative humidity dependent light scattering of aerosols
dc.type01A - Beitrag in wissenschaftlicher Zeitschrift
dc.volume3
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.openAccessCategoryGold
fhnw.pagination39-50
fhnw.publicationStatePublished
relation.isAuthorOfPublication05dd9a19-7a24-4325-805a-2d121483b168
relation.isAuthorOfPublication.latestForDiscovery05dd9a19-7a24-4325-805a-2d121483b168
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