Cloud forming potential of secondary organic aerosol under near atmospheric conditions

Cloud droplets form by nucleation on atmospheric aerosol particles. Populations of such particles invariably contain organic material, a major source of which is thought to be condensation of photo‐oxidation products of biogenic volatile organic compounds (VOCs). We demonstrate that smog chamber studies of the formation of such biogenic secondary organic aerosol (SOA) formed during photo‐oxidation must be conducted at near atmospheric concentrations to yield atmospherically representative particle composition, hygroscopicity and cloud‐forming potential. Under these conditions, the hygroscopicity measured at 95% relative humidity can be used reliably to predict the CCN activity of the SOA particles by assuming droplet surface tension of pure water. We also show that the supersaturation required to activate a given size of particle decreases with age.

Schlagwörter

Fachgebiet (DDC)

550 - Geowissenschaften

Projekt

Veranstaltung

Startdatum der Ausstellung

Enddatum der Ausstellung

Startdatum der Konferenz

Enddatum der Konferenz

Datum der letzten Prüfung

ISBN

ISSN

0094-8276
1944-8007

Sprache

Englisch

Während FHNW Zugehörigkeit erstellt

Nein

Zukunftsfelder FHNW

Publikationsstatus

Veröffentlicht

Begutachtung

Peer-Review der ganzen Publikation

Open Access-Status

Closed

Lizenz

Zitation

DUPLISSY, Jonathan, Martin GYSEL, M. Rami ALFARRA, Josef DOMMEN, Axel METZGER, André S.H. PRÉVÔT, Ernest WEINGARTNER, Ari LAAKSONEN, Tomi RAATIKAINEN, Nicholas GOOD, S. Fiona TURNER, Gordon MCFIGGANS und Urs BALTENSPERGER, 2008. Cloud forming potential of secondary organic aerosol under near atmospheric conditions. Geophysical Research Letters. 2008. Bd. 35, Nr. 3. DOI 10.1029/2007gl031075. Verfügbar unter: https://irf.fhnw.ch/handle/11654/46688

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