Chemical probes of atmospherically relevant particle and ice surfaces

COLL 283

Joel Thornton, thornton@atmos.washington.edu1, James P Kercher, kercher@atmos.washington.edu1, Reddy Yatavelli1, V. Faye McNeill, vfmcneill@columbia.edu2, and Glenn M Wolfe, gwolfe@u.washington.edu3. (1) Department of Atmospheric Sciences, University of Washington, 408 ATG Building, Seattle, WA 98195, (2) Department of Chemical Engineering, Columbia University, 500 W. 120th St. Room 816, New York, NY 10027, (3) Department of Chemistry, University of Washington, Seattle, WA 98103
Heterogeneous chemistry on particles and ice surfaces plays an important role in modifying atmospheric composition. However, the nature of aerosol particle and ice surfaces in the atmosphere remains poorly understood with consequences for developing accurate parameterizations to use in air quality and coupled chemistry-climate models. I will present results from laboratory experiments that utilize N2O5 and the OH radical as indirect probes of the interfacial composition and phase state of both mixed organic-inorganic aerosol particles and sea ice. These results demonstrate the importance of: 1) the phase state and partitioning of organics in atmospheric particles on both the reactive uptake rate of N2O5 and the oxidation lifetime of particulate-bound organics, and 2) temperature on the surface composition of sea ice and thus its halogen activation potential.
 

The Physical Chemistry of Environmental Interfaces
9:00 AM-1:10 PM, Tuesday, April 8, 2008 Morial Convention Center -- Rm. 225, Oral

Division of Colloid & Surface Chemistry

The 235th ACS National Meeting, New Orleans, LA, April 6-10, 2008