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Scavenging of black carbon in mixed phase clouds at the high alpine site Jungfraujoch

Cozic, Julie und Verheggen, Bart und Mertes, Stephan und Connolly, Paul und Bower, Keith und Petzold, Andreas und Baltensperger, Urs und Weingartner, Ernest (2007) Scavenging of black carbon in mixed phase clouds at the high alpine site Jungfraujoch. Atmospheric Chemistry and Physics, 7, Seiten 1797-1807.

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Offizielle URL: http://www.atmos-chem-phys.net/7/1797/2007/

Kurzfassung

The scavenging of black carbon (BC) in liquid and mixed phase clouds was investigated during intensive experiments in winter 2004, summer 2004 and winter 2005 at the high alpine research station Jungfraujoch (3580m a.s.l., Switzerland). Aerosol residuals were sampled behind two well characterized inlets; a total inlet which collected cloud particles (droplets and ice particles) as well as interstitial (unactivated) aerosol particles; an interstitial inlet which collected only interstitial aerosol particles. BC concentrations were measured behind each of these inlets along with the submicrometer aerosol number size distribution, from which a volume concentration was derived. These measurements were complemented by in-situ measurements of cloud microphysical parameters. BC was found to be scavenged into the condensed phase to the same extent as the bulk aerosol, which suggests that BC was covered with soluble material through aging processes, rendering it more hygroscopic. The scavenged fraction of BC (FScav,BC), defined as the fraction of BC that is incorporated into cloud droplets and ice crystals, decreases with increasing cloud ice mass fraction (IMF) from F(Scav, BC) = 60% in liquid phase clouds to F(Scav,BC) = 5–10% in mixed-phase clouds with IMF>0.2. This can be explained by the evaporation of liquid droplets in the presence of ice crystals (Wegener-Bergeron-Findeisen process), releasing BC containing cloud condensation nuclei back into the interstitial phase. In liquid clouds, the scavenged BC fraction is found to decrease with decreasing cloud liquid water content. The scavenged BC fraction is also found to decrease with increasing BC mass concentration since there is an increased ompetition for the available water vapour.

Dokumentart:Zeitschriftenbeitrag
Titel:Scavenging of black carbon in mixed phase clouds at the high alpine site Jungfraujoch
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Cozic, JuliePSI, Villigen, CH
Verheggen, BartPSI, Villigen, CH
Mertes, StephanLeibniz-Inst. for Tropospheric Research, Leipzig
Connolly, PaulUniv. of Manchester, UK
Bower, KeithUniv. of Manchester, UK
Petzold, AndreasNICHT SPEZIFIZIERT
Baltensperger, UrsPSI, Villigen, CH
Weingartner, ErnestPSI, Villigen, CH
Datum:2007
Erschienen in:Atmospheric Chemistry and Physics
Referierte Publikation:Ja
In Open Access:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:7
Seitenbereich:Seiten 1797-1807
Status:veröffentlicht
Stichwörter:black carbon, soot, aerosol scavenging, aerosol indirect effect, MAAP
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Verkehr
HGF - Programmthema:V UR - Schonung von Umwelt und Ressourcen (alt)
DLR - Schwerpunkt:Verkehr
DLR - Forschungsgebiet:V UR - Schonung von Umwelt und Ressourcen
DLR - Teilgebiet (Projekt, Vorhaben):V - Umweltwirkungen des Verkehrs (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Atmosphärische Spurenstoffe
Hinterlegt von: Dr.rer.nat. Andreas Petzold
Hinterlegt am:25 Jun 2007
Letzte Änderung:20 Okt 2014 14:31

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