Evidence for the role of organics in aerosol particle formation under atmospheric conditions

New particle formation in the atmosphere is an important parameter in governing the radiative forcing of atmospheric aerosols. However, detailed nucleation mechanisms remain ambiguous, as laboratory data have so far not been successful in explaining atmospheric nucleation. We investigated the formation of new particles in a smog chamber simulating the photochemical formation of H2SO4 and organic condensable species. Nucleation occurs at H2SO4 concentrations similar to those found in the ambient atmosphere during nucleation events. The measured particle formation rates are proportional to the product of the concentrations of H2SO4 and an organic molecule. This suggests that only one H2SO4 molecule and one organic molecule are involved in the rate-limiting step of the observed nucleation process. Parameterizing this process in a global aerosol model results in substantially better agreement with ambient observations compared to control runs.

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

1091-6490
0027-8424

Sprache

Englisch

Während FHNW Zugehörigkeit erstellt

Nein

Zukunftsfelder FHNW

Publikationsstatus

Veröffentlicht

Begutachtung

Peer-Review der ganzen Publikation

Open Access-Status

Closed

Lizenz

Zitation

METZGER, Axel, Bart VERHEGGEN, Josef DOMMEN, Jonathan DUPLISSY, André S.H. PRÉVÔT, Ernest WEINGARTNER, Ilona RIIPINEN, Markku KULMALA, Dominick V. SPRACKLEN, Kenneth S. CARSLAW und Urs BALTENSPERGER, 2010. Evidence for the role of organics in aerosol particle formation under atmospheric conditions. Proceedings of the National Academy of Sciences of the United States of America. 19 Januar 2010. Bd. 107, Nr. 15, S. 6646–6651. DOI 10.1073/pnas.0911330107. Verfügbar unter: https://irf.fhnw.ch/handle/11654/46612

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