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Wiley InterScience | |||||||||||||||
  Tellus BVolume 58 Issue 3, Pages 196 - 205 Published Online: 8 Jun 2006 Journal compilation © 2010 Blackwell Munksgaard
Abstract | References | Full Text: HTML, PDF (Size: 252K) | Related Articles | Citation Tracking  Cloud droplet activation of polymerized organic aerosol Copyright
Blackwell Munksgaard, 2006
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. (Manuscript received 7 June 2005; in final form 19 December 2005) | 
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