A synthesis of cloud condensation nuclei counter (CCNC) measurements within the EUCAARI network

dc.contributor.authorParamonov, Mikhail
dc.contributor.authorKerminen, Veli-Matti
dc.contributor.authorGysel, Martin
dc.contributor.authorAalto, Pasi Pekka
dc.contributor.authorAndreae, Meinrat O.
dc.contributor.authorAsmi, Eija
dc.contributor.authorBaltensperger, Urs
dc.contributor.authorBougiatioti, Aikaterini
dc.contributor.authorBrus, David
dc.contributor.authorFrank, Göran
dc.contributor.authorGood, Nicholas
dc.contributor.authorGunthe, Sachin S.
dc.contributor.authorHao, Liqing
dc.contributor.authorIrwin, Martin
dc.contributor.authorJaatinen, Antti
dc.contributor.authorJurányi, Zsófia
dc.contributor.authorKing, S. M.
dc.contributor.authorKortelainen, Aki
dc.contributor.authorKristensson, Adam
dc.contributor.authorLihavainen, Heikki
dc.contributor.authorKulmala, Markku
dc.contributor.authorLohmann, Ulrike
dc.contributor.authorMartin, Scot T.
dc.contributor.authorMcFiggans, Gordon
dc.contributor.authorMihalopoulos, Nikolaos
dc.contributor.authorNenes, Athanasios
dc.contributor.authorO'Dowd, Colin D.
dc.contributor.authorOvadnevaite, Jurgita
dc.contributor.authorPetäjä, Tuukka
dc.contributor.authorPöschl, Ulrich
dc.contributor.authorRoberts, Greg
dc.contributor.authorRose, Diana
dc.contributor.authorSvenningsson, Birgitta
dc.contributor.authorSwietlicki, Erik
dc.contributor.authorWeingartner, Ernest
dc.contributor.authorWhitehead, James
dc.contributor.authorWiedensohler, Alfred
dc.contributor.authorWittbom, Cerina
dc.contributor.authorSierau, Berko
dc.date.accessioned2024-02-08T08:58:27Z
dc.date.available2024-02-08T08:58:27Z
dc.date.issued2015
dc.description.abstractCloud condensation nuclei counter (CCNC) measurements performed at 14 locations around the world within the European Integrated project on Aerosol Cloud Climate and Air Quality interactions (EUCAARI) framework have been analysed and discussed with respect to the cloud condensation nuclei (CCN) activation and hygroscopic properties of the atmospheric aerosol. The annual mean ratio of activated cloud condensation nuclei (NCCN) to the total number concentration of particles (NCN), known as the activated fraction A, shows a similar functional dependence on supersaturation S at many locations – exceptions to this being certain marine locations, a free troposphere site and background sites in south-west Germany and northern Finland. The use of total number concentration of particles above 50 and 100 nm diameter when calculating the activated fractions (A50 and A100, respectively) renders a much more stable dependence of A on S; A50 and A100 also reveal the effect of the size distribution on CCN activation. With respect to chemical composition, it was found that the hygroscopicity of aerosol particles as a function of size differs among locations. The hygroscopicity parameter κ decreased with an increasing size at a continental site in south-west Germany and fluctuated without any particular size dependence across the observed size range in the remote tropical North Atlantic and rural central Hungary. At all other locations κ increased with size. In fact, in Hyytiälä, Vavihill, Jungfraujoch and Pallas the difference in hygroscopicity between Aitken and accumulation mode aerosol was statistically significant at the 5 % significance level. In a boreal environment the assumption of a size-independent κ can lead to a potentially substantial overestimation of NCCN at S levels above 0.6 %. The same is true for other locations where κ was found to increase with size. While detailed information about aerosol hygroscopicity can significantly improve the prediction of NCCN, total aerosol number concentration and aerosol size distribution remain more important parameters. The seasonal and diurnal patterns of CCN activation and hygroscopic properties vary among three long-term locations, highlighting the spatial and temporal variability of potential aerosol–cloud interactions in various environments.
dc.identifier.doi10.5194/acp-15-12211-2015
dc.identifier.issn1680-7324
dc.identifier.issn1680-7316
dc.identifier.urihttps://irf.fhnw.ch/handle/11654/44263
dc.identifier.urihttps://doi.org/10.26041/fhnw-8076
dc.issue21
dc.language.isoen
dc.publisherCopernicus
dc.relation.ispartofAtmospheric Chemistry and Physics
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.spatialGöttingen
dc.subject.ddc620 - Ingenieurwissenschaften und Maschinenbau
dc.titleA synthesis of cloud condensation nuclei counter (CCNC) measurements within the EUCAARI network
dc.type01A - Beitrag in wissenschaftlicher Zeitschrift
dc.volume15
dspace.entity.typePublication
fhnw.InventedHereYes
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.pagination12211–12229
fhnw.publicationStatePublished
relation.isAuthorOfPublication54997bb8-cf4a-4120-b0c7-f8e731e8eea1
relation.isAuthorOfPublication05dd9a19-7a24-4325-805a-2d121483b168
relation.isAuthorOfPublication.latestForDiscovery54997bb8-cf4a-4120-b0c7-f8e731e8eea1
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