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dc.contributor.author
Lacher, Larissa
dc.contributor.author
Clemen, Hans-Christian
dc.contributor.author
Shen, Xiaoli
dc.contributor.author
Mertes, Stephan
dc.contributor.author
Gysel-Beer, Martin
dc.contributor.author
Moallemi, Alireza
dc.contributor.author
Steinbacher, Martin
dc.contributor.author
Henne, Stephan
dc.contributor.author
Saathoff, Harald
dc.contributor.author
Möhler, Ottmar
dc.contributor.author
Höhler, Kristina
dc.contributor.author
Schiebel, Thea
dc.contributor.author
Weber, Daniel
dc.contributor.author
Schrod, Jann
dc.contributor.author
Schneider, Johannes
dc.contributor.author
Kanji, Zamin A
dc.date.accessioned
2022-01-19T08:01:54Z
dc.date.available
2021-12-04T04:50:31Z
dc.date.available
2022-01-19T08:01:54Z
dc.date.issued
2021-11-23
dc.identifier.issn
1680-7375
dc.identifier.issn
1680-7367
dc.identifier.other
10.5194/acp-21-16925-2021
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/518601
dc.identifier.doi
10.3929/ethz-b-000518601
dc.description.abstract
Primary ice formation in mixed-phase clouds is initiated by a minute subset of the ambient aerosol population, called ice-nucleating particles (INPs). The knowledge about their atmospheric concentration, composition, and source in cloud-relevant environments is still limited. During the 2017 joint INUIT/CLACE (Ice Nuclei research UnIT/CLoud-Aerosol Characterization Experiment) field campaign, observations of INPs as well as of aerosol physical and chemical properties were performed, complemented by source region modeling. This aimed at investigating the nature and sources of INPs. The campaign took place at the High-Altitude Research Station Jungfraujoch (JFJ), a location where mixed-phase clouds frequently occur. Due to its altitude of 3580ma.s.l., the station is usually located in the lower free troposphere, but it can also receive air masses from terrestrial and marine sources via long-range transport. INP concentrations were quasi-continuously detected with the Horizontal Ice Nucleation Chamber (HINC) under conditions representing the formation of mixed-phase clouds at 31 degrees C. The INP measurements were performed in parallel to aerosol measurements from two single-particle mass spectrometers, the Aircraft-based Laser ABlation Aerosol MAss Spectrometer (ALABAMA) and the laser ablation aerosol particle time-of-flight mass spectrometer (LAAPTOF). The chemical identity of INPs is inferred by correlating the time series of ion signals measured by the mass spectrometers with the time series of INP measurements. Moreover, our results are complemented by the direct analysis of ice particle residuals (IPRs) by using an ice-selective inlet (IceCVI) coupled with the ALABAMA. Mineral dust particles and aged sea spray particles showed the highest correlations with the INP time series. Their role as INPs is further supported by source emission sensitivity analysis using atmospheric transport modeling, which confirmed that air masses were advected from the Sahara and marine environments during times of elevated INP concentrations and ice-active surface site densities. Indeed, the IPR analysis showed that, by number, mineral dust particles dominated the IPR composition (similar to 58 %), and biological and metallic particles are also found to a smaller extent (similar to 10% each). Sea spray particles are also found as IPRs (17 %), and their fraction in the IPRs strongly varied according to the increased presence of small IPRs, which is likely due to an impact from secondary ice crystal formation. This study shows the capability of combining INP concentration measurements with chemical characterization of aerosol particles using single-particle mass spectrometry, source region modeling, and analysis of ice residuals in an environment directly relevant for mixed-phase cloud formation.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Copernicus
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.title
Sources and nature of ice-nucleating particles in the free troposphere at Jungfraujoch in winter 2017
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
ethz.journal.title
Atmospheric Chemistry and Physics
ethz.journal.volume
21
en_US
ethz.journal.issue
22
en_US
ethz.journal.abbreviated
Atmos. chem. phys.
ethz.pages.start
16925
en_US
ethz.pages.end
16953
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Göttingen
en_US
ethz.publication.status
published
en_US
ethz.relation.isSupplementedBy
10.3929/ethz-b-000484207
ethz.date.deposited
2021-12-04T04:52:22Z
ethz.source
WOS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2022-01-19T08:02:12Z
ethz.rosetta.lastUpdated
2022-03-29T17:40:45Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
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