Immersion freezing of birch pollen washing water

dc.bibliographicCitation.firstPage10989eng
dc.bibliographicCitation.issue21eng
dc.bibliographicCitation.lastPage11003eng
dc.bibliographicCitation.volume13
dc.contributor.authorAugustin, S.
dc.contributor.authorWex, H.
dc.contributor.authorNiedermeier, D.
dc.contributor.authorPummer, B.
dc.contributor.authorGrothe, H.
dc.contributor.authorHartmann, S.
dc.contributor.authorTomsche, L.
dc.contributor.authorClauss, T.
dc.contributor.authorVoigtländer, J.
dc.contributor.authorIgnatius, K.
dc.contributor.authorStratmann, F.
dc.date.accessioned2017-11-27T20:59:15Z
dc.date.available2019-06-26T17:19:08Z
dc.date.issued2013
dc.description.abstractBirch pollen grains are known to be ice nucleating active biological particles. The ice nucleating activity has previously been tracked down to biological macromolecules that can be easily extracted from the pollen grains in water. In the present study, we investigated the immersion freezing behavior of these ice nucleating active (INA) macromolecules. Therefore we measured the frozen fractions of particles generated from birch pollen washing water as a function of temperature at the Leipzig Aerosol Cloud Interaction Simulator (LACIS). Two different birch pollen samples were considered, with one originating from Sweden and one from the Czech Republic. For the Czech and Swedish birch pollen samples, freezing was observed to start at −19 and −17 °C, respectively. The fraction of frozen droplets increased for both samples down to −24 °C. Further cooling did not increase the frozen fractions any more. Instead, a plateau formed at frozen fractions below 1. This fact could be used to determine the amount of INA macromolecules in the droplets examined here, which in turn allowed for the determination of nucleation rates for single INA macromolecules. The main differences between the Swedish birch pollen and the Czech birch pollen were obvious in the temperature range between −17 and −24 °C. In this range, a second plateau region could be seen for Swedish birch pollen. As we assume INA macromolecules to be the reason for the ice nucleation, we concluded that birch pollen is able to produce at least two different types of INA macromolecules. We were able to derive parameterizations for the heterogeneous nucleation rates for both INA macromolecule types, using two different methods: a simple exponential fit and the Soccer ball model. With these parameterization methods we were able to describe the ice nucleation behavior of single INA macromolecules from both the Czech and the Swedish birch pollen.eng
dc.description.versionpublishedVersioneng
dc.formatapplication/pdf
dc.identifier.urihttps://doi.org/10.34657/1023
dc.identifier.urihttps://oa.tib.eu/renate/handle/123456789/652
dc.language.isoengeng
dc.publisherMünchen : European Geopyhsical Unioneng
dc.relation.doihttps://doi.org/10.5194/acp-13-10989-2013
dc.relation.ispartofseriesAtmospheric Chemistry and Physics, Volume 13, Issue 21, Page 10989-11003eng
dc.rights.licenseCC BY 3.0 Unportedeng
dc.rights.urihttps://creativecommons.org/licenses/by/3.0/eng
dc.subjectaerosoleng
dc.subjectcoolingeng
dc.subjectdropleteng
dc.subjectfreezingeng
dc.subjectnucleationeng
dc.subjectparameterizationeng
dc.subjectparticulate mattereng
dc.subjectpolleneng
dc.subject.ddc550eng
dc.titleImmersion freezing of birch pollen washing watereng
dc.typearticleeng
dc.typeTexteng
dcterms.bibliographicCitation.journalTitleAtmospheric Chemistry and Physicseng
tib.accessRightsopenAccesseng
wgl.contributorTROPOSeng
wgl.subjectGeowissenschafteneng
wgl.typeZeitschriftenartikeleng
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