Cloud droplet activation of polymerized organic aerosol

Markus D. Petters, Sonia M. Kreidenweis, Jefferson R. Snider, Kirsten A. Koehler, Qiang Wang, Anthony J. Prenni, Paul J. Demott

Research output: Contribution to journalArticlepeer-review

Abstract

High-molecular-weight organic compounds represent an important fraction in atmospheric aerosols, but their interactions with atmospheric water vapour are not well understood. Specifically, the hygroscopicity of polymerized atmospheric aerosols is larger than expected for their high molecular weights and is not a strong function of the degree of polymerization, but their cloud-nucleating activity declines as polymerization progresses. We apply a Flory-Huggins based theory for polymer-water interactions to describe water activity in aqueous solutions of atmospherically relevant oligomers and polymers, and show via experiments on particles composed of commercial polymers that it is consistent with observed particle hygroscopic growth and cloud formation behaviour.

Original languageEnglish (US)
Pages (from-to)196-205
Number of pages10
JournalTellus, Series B: Chemical and Physical Meteorology
Volume58
Issue number3
DOIs
StatePublished - Jul 2006
Externally publishedYes

ASJC Scopus subject areas

  • Atmospheric Science

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