Please use this identifier to cite or link to this item: https://oar.tib.eu/jspui/handle/123456789/757
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dc.rights.licenseCC BY 3.0 Unportedger
dc.contributor.authorKupiszewski, P.
dc.contributor.authorWeingartner, E.
dc.contributor.authorVochezer, P.
dc.contributor.authorSchnaiter, M.
dc.contributor.authorBigi, A.
dc.contributor.authorGysel, M.
dc.contributor.authorRosati, B.
dc.contributor.authorToprak, E.
dc.contributor.authorMertes, S.
dc.contributor.authorBaltensperger, U.
dc.date.accessioned2017-12-14T00:22:31Z
dc.date.available2019-06-26T17:20:16Z
dc.date.issued2015
dc.identifier.urihttps://oar.tib.eu/jspui/handle/123456789/757
dc.identifier.urihttp://dx.doi.org/10.34657/1342-
dc.description.abstractClimate predictions are affected by high uncertainties partially due to an insufficient knowledge of aerosol–cloud interactions. One of the poorly understood processes is formation of mixed-phase clouds (MPCs) via heterogeneous ice nucleation. Field measurements of the atmospheric ice phase in MPCs are challenging due to the presence of much more numerous liquid droplets. The Ice Selective Inlet (ISI), presented in this paper, is a novel inlet designed to selectively sample pristine ice crystals in mixed-phase clouds and extract the ice residual particles contained within the crystals for physical and chemical characterization. Using a modular setup composed of a cyclone impactor, droplet evaporation unit and pumped counterflow virtual impactor (PCVI), the ISI segregates particles based on their inertia and phase, exclusively extracting small ice particles between 5 and 20 μm in diameter. The setup also includes optical particle spectrometers for analysis of the number size distribution and shape of the sampled hydrometeors. The novelty of the ISI is a droplet evaporation unit, which separates liquid droplets and ice crystals in the airborne state, thus avoiding physical impaction of the hydrometeors and limiting potential artefacts. The design and validation of the droplet evaporation unit is based on modelling studies of droplet evaporation rates and computational fluid dynamics simulations of gas and particle flows through the unit. Prior to deployment in the field, an inter-comparison of the optical particle size spectrometers and a characterization of the transmission efficiency of the PCVI was conducted in the laboratory. The ISI was subsequently deployed during the Cloud and Aerosol Characterization Experiment (CLACE) 2013 and 2014 – two extensive international field campaigns encompassing comprehensive measurements of cloud microphysics, as well as bulk aerosol, ice residual and ice nuclei properties. The campaigns provided an important opportunity for a proof of concept of the inlet design. In this work we present the setup of the ISI, including the modelling and laboratory characterization of its components, as well as field measurements demonstrating the ISI performance and validating the working principle of the inlet. Finally, measurements of biological aerosol during a Saharan dust event (SDE) are presented, showing a first indication of enrichment of bio-material in sub-2 μm ice residuals.
dc.formatapplication/pdf
dc.languageeng
dc.publisherMünchen : European Geopyhsical Union
dc.relation.ispartofseriesAtmospheric Measurement Techniques, Volume 8, Issue 8, Page 3087-3106-
dc.rights.urihttps://creativecommons.org/licenses/by/3.0/ger
dc.subjectaerosol
dc.subjectclimate prediction
dc.subjectcloud microphysics
dc.subjectcomputational fluid dynamics
dc.subjectdroplet
dc.subjectevaporation
dc.subjectheterogeneity
dc.subjecthydrometeorology
dc.subjectice crystal
dc.subjectmeasurement method
dc.subjectnucleation
dc.subjectoptical property
dc.subjectparticle size
dc.subjectphysicochemical property
dc.subjectsize distribution
dc.subject.ddc550
dc.titleThe Ice Selective Inlet: A novel technique for exclusive extraction of pristine ice crystals in mixed-phase clouds
dc.typearticle-
dc.typeText-
dc.description.versionpublishedVersioneng
local.accessRightsopenAccess-
wgl.contributorTROPOSger
wgl.subjectGeowissenschaftenger
wgl.typeZeitschriftenartikelger
dc.relation.doihttps://doi.org/10.5194/amt-8-3087-2015
dcterms.bibliographicCitation.journalTitleAtmospheric Measurement Techniques-
local.identifier.doihttp://dx.doi.org/10.34657/1342-
Appears in Collections:Geowissenschaften

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