HR: 16:25h
AN: A44B-02    [Abstracts]
TI: Uptake and Reactivity of Organic Compounds at the Air-Ice Interface
AU: * Kahan, T F
EM: tkahan@chem.utoronto.ca
AF: Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, ON M5S 3H6, Canada
AU: Donaldson, J
EM: jdonalds@chem.utoronto.ca
AF: Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, ON M5S 3H6, Canada
AB: We have developed laser-induced fluorescence and Raman spectroscopic methods to probe the chemical environments of organic compounds in the quasi-liquid layer (QLL) at the air-surface boundary of ice and snow, as well as changes in the compounds' concentrations. The uptake and reactivity of the organic species to the QLL differ from those measured at the liquid water surface. Chemical reactions and physical interactions such as the self-association of aromatic hydrocarbons occur much more readily at the ice surface than at liquid water surfaces, even at temperatures close to the melting point. Pronounced differences in photochemical kinetics are observed in the QLL compared to those measured on liquid water surfaces. We will discuss these results, as well as experiments which probe ozonation rates in the QLL, as a function of temperature.
DE: 0317 Chemical kinetic and photochemical properties
DE: 0320 Cloud physics and chemistry
DE: 0365 Troposphere: composition and chemistry
DE: 0394 Instruments and techniques
DE: 0738 Ice (1863)
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting