HR: 13:40h
AN: A13F-01 INVITED     [Abstracts]
TI: How are Gases Transferred from the Atmosphere to Snow and Ice Surfaces?
AU: * Abbatt, J
EM: jabbatt@chem.utoronto.ca
AF: University of Toronto, Department of Chemistry 80 St. George St., Toronto, ON M5S 3H6 Canada
AB: Aside from mass transfer through the gas phase, the rate-determining step for transferring a gas from the atmosphere to ice or snow is frequently determined by the chemistry of the gas-ice surface interaction. What are the kinetics of this uptake process? How are they affected as the surface becomes coated? What is the capacity of the surface to adsorb gaseous species? How does the uptake change if the ice is growing or evaporating? Does uptake to polycrystalline snow differ from that to ice of large crystal size? How does the uptake capacity of ice change at high temperatures, as the quasi-liquid layer thickness grows? To investigate these effects, this talk will focus on some recent studies we have performed in the laboratory using nitric acid and small oxygenated organics as the adsorbing molecules, and using both ice and polycrystalline snow samples.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0317 Chemical kinetic and photochemical properties
DE: 0365 Troposphere: composition and chemistry
DE: 0399 General or miscellaneous
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005