The influence of small aerosol particles on the properties of water and ice clouds
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Autor:innen
Choularton, Thomas W.
Bower, Keith N.
Crawford, Ian
Coe, Hugh
Gallagher, Martin W.
Flynn, Michael
Crosier, Jonathan
Connolly, Paul
Targino, Admir Créso
Autor:in (Körperschaft)
Publikationsdatum
09.08.2008
Typ der Arbeit
Studiengang
Typ
01A - Beitrag in wissenschaftlicher Zeitschrift
Herausgeber:innen
Herausgeber:in (Körperschaft)
Betreuer:in
Übergeordnetes Werk
Faraday Discussions
Themenheft
DOI der Originalpublikation
Link
Reihe / Serie
Reihennummer
Jahrgang / Band
137
Ausgabe / Nummer
Seiten / Dauer
205-222
Patentnummer
Verlag / Herausgebende Institution
Royal Society of Chemistry
Verlagsort / Veranstaltungsort
London
Auflage
Version
Programmiersprache
Abtretungsempfänger:in
Praxispartner:in/Auftraggeber:in
Zusammenfassung
In this paper, results are presented of the influence of small organic- and soot-containing particles on the formation of water and ice clouds. There is strong evidence that these particles have grown from nano particle seeds produced by the combustion of oil products. Two series of field experiments are selected to represent the observations made. The first is the CLoud-Aerosol Characterisation Experiment (CLACE) series of experiments performed at a high Alpine site (Jungfraujoch), where cloud was in contact with the ground and the measuring station. Both water and ice clouds were examined at different times of the year. The second series of experiments is the CLOud Processing of regional Air Pollution advecting over land and sea (CLOPAP) series, where ageing pollution aerosol from UK cities was observed, from an airborne platform, to interact with warm stratocumulus cloud in a cloud-capped atmospheric boundary layer. Combining the results it is shown that aged pollution aerosol consists of an internal mixture of organics, sulfate, nitrate and ammonium, the organic component is dominated by highly oxidized secondary material. The relative contributions and absolute loadings of the components vary with location and season. However, these aerosols act as Cloud Condensation Nuclei (CCN) and much of the organic material, along with the other species, is incorporated into cloud droplets. In ice and mixed phase cloud, it is observed that very sharp transitions (extending over just a few metres) are present between highly glaciated regions and regions consisting of supercooled water. This is a unique finding; however, aircraft observations in cumulus suggest that this kind of structure may be found in these cloud types too. It is suggested that this sharp transition is caused by ice nucleation initiated by oxidised organic aerosol coated with sulfate in more polluted regions of cloud, sometimes enhanced by secondary ice particle production in these regions.
Schlagwörter
Fachgebiet (DDC)
Veranstaltung
Startdatum der Ausstellung
Enddatum der Ausstellung
Startdatum der Konferenz
Enddatum der Konferenz
Datum der letzten Prüfung
ISBN
ISSN
1359-6640
1364-5498
1364-5498
Sprache
Englisch
Während FHNW Zugehörigkeit erstellt
Nein
Publikationsstatus
Veröffentlicht
Begutachtung
Peer-Review der ganzen Publikation
Open Access-Status
Closed
Lizenz
Zitation
CHOULARTON, Thomas W., Keith N. BOWER, Ernest WEINGARTNER, Ian CRAWFORD, Hugh COE, Martin W. GALLAGHER, Michael FLYNN, Jonathan CROSIER, Paul CONNOLLY, Admir Créso TARGINO, M. Rami ALFARRA, Urs BALTENSPERGER, Staffan SJÖGREN, Bart VERHEGGEN, Julie COZIC und Martin GYSEL, 2008. The influence of small aerosol particles on the properties of water and ice clouds. Faraday Discussions. 9 August 2008. Bd. 137, S. 205–222. DOI 10.1039/b702722m. Verfügbar unter: https://irf.fhnw.ch/handle/11654/46700