Journal Article

PreJuSER-22986

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Hygroscopic growth and droplet activation of soot particles: uncoated, succinic or sulfuric acid coated

Henning, S. ; Ziese, M. ; Kiselev, A. ; Saathoff, H. ; Möhler, O. ; Mentel, T. F.FZJ* ; Buchholz, A.FZJ* ; Spindler, C.FZJ* ; Michaud, V. ; Monier, M. ; Sellegri, K. ; Stratmann, F.

2012
EGU Katlenburg-Lindau

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Please use a persistent id in citations: http://hdl.handle.net/2128/7598  doi:10.5194/acp-12-4525-2012

Abstract: The hygroscopic growth and droplet activation of uncoated soot particles and such coated with succinic acid and sulfuric acid were investigated during the IN-11 campaign at the Aerosol Interaction and Dynamics in the Atmosphere (AIDA) facility. A GFG-1000 soot generator applying either nitrogen or argon as carrier gas and a miniCAST soot generator were utilized to generate soot particles. Different organic carbon (OC) to black carbon (BC) ratios were adjusted for the CAST-soot by varying the fuel to air ratio. The hygroscopic growth was investigated by means of the mobile Leipzig Aerosol Cloud Interaction Simulator (LACIS-mobile) and two different Hygroscopicity Tandem Differential Mobility Analyzers (HTDMA, VHTDMA). Two Cloud Condensation Nucleus Counter (CCNC) were applied to measure the activation of the particles. For the untreated soot particles neither hygroscopic growth nor activation was observed at a supersaturation of 1%, with exception of a partial activation of GFG-soot generated with argon as carrier gas. Coatings of succinic acid lead to a detectable hygroscopic growth of GFG-soot and enhanced the activated fraction of GFG- (carrier gas: argon) and CAST-soot, whereas no hygroscopic growth of the coated CAST-soot was found. Sulfuric acid coatings led to an OC-content dependent hygroscopic growth of CAST-soot. Such a dependence was not observed for activation measurements. Coating with sulfuric acid decreased the amount of Polycyclic Aromatic Hydrocarbons (PAH), which were detected by AMS-measurements in the CAST-soot, and increased the amount of substances with lower molecular weight than the initial PAHs. We assume that these reaction products increased the hygroscopicity of the coated particles in addition to the coating substance itself.

Keyword(s): J

Note: We are grateful for financial support by the Helmholtz Virtual Institute "Aerosol Cloud Interaction" (VI-ACI). Traveling expenses of the LaMP group as well as the VHTDMA transport were funded by the ESF programme INTROP, which we would like to acknowledge here. Furthermore, we would like to thank Stefan Benz for coordinating the IN-11 campaign at the AIDA facility.

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Contributing Institute(s):

1. Troposphäre (IEK-8)

Research Program(s):

1. Atmosphäre und Klima (P23)

Appears in the scientific report 2012

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Database coverage:
; ; ; ; Current Contents - Social and Behavioral Sciences ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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