HR: 14:40h
AN: A42E-05    [PDF]
TI: Organic cloud condensation nuclei: the effect of phase, surface tension, trace soluble species, and oxidative processing on particle activation.
AU: * Broekhuizen, K E
EM: kbroekhu@chem.utoronto.ca
AF: Department of Chemistry University of Toronto, 80 St. George St., Toronto, ON M5S 3H6 Canada
AU: Thornberry, T
EM: tthornbe@chem.utoronto.ca
AF: Department of Chemistry University of Toronto, 80 St. George St., Toronto, ON M5S 3H6 Canada
AU: Abbatt, J P
EM: jabbatt@chem.utoronto.ca
AF: Department of Chemistry University of Toronto, 80 St. George St., Toronto, ON M5S 3H6 Canada
AB: The ability of organic aerosols to act as cloud condensation nuclei (CCN) will be discussed. A variety of laboratory experiments will be presented which address several key questions concerning organic particle activation. Does the particle phase impact activation? How does surface tension play a role and can a trace amount of a surface active species impact activation? Does a trace amount of a highly soluble species impact the activation of organic particles of moderate to low solubility? Can the activation properties of organic aerosols be enhanced through oxidative processing? To systematically address these issues, the CCN activity of various diacids such as oxalic, malonic, succinic, adipic and azelaic acid have been studied, as well as the addition of trace amounts of nonanoic acid and ammonium sulfate to examine the roles of surface active and soluble species, respectively. The first examination of the role of oxidative processing on CCN activity has involved investigating the effect of ozone oxidation on the activity of oleic acid particles.
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0320 Cloud physics and chemistry
DE: 0365 Troposphere--composition and chemistry
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting