HR: 11:00h
AN: A41G-03    [PDF]
TI: Organic Aerosol Nucleation From the Oxidation Products of $\alpha$-pinene
AU: * Baynard, T
EM: tbaynard@al.noaa.gov
AF: Aeronomy Laboratory, National Oceanic and Atmospheric Administration, 325 Broadway, Boulder, CO 80305 United States
AU: * Baynard, T
EM: tbaynard@al.noaa.gov
AF: Cooperative Institute for Research in the Environmental Sciences, The University of Colorado, Boulder, CO 80309 United States
AU: Burkholder, J
AF: Aeronomy Laboratory, National Oceanic and Atmospheric Administration, 325 Broadway, Boulder, CO 80305 United States
AU: Lovejoy, E
AF: Aeronomy Laboratory, National Oceanic and Atmospheric Administration, 325 Broadway, Boulder, CO 80305 United States
AU: Ravishankara, A R
AF: Aeronomy Laboratory, National Oceanic and Atmospheric Administration, 325 Broadway, Boulder, CO 80305 United States
AU: Ravishankara, A R
AF: Cooperative Institute for Research in the Environmental Sciences, The University of Colorado, Boulder, CO 80309 United States
AB: This laboratory study focuses on new particle formation resulting from the oxidation of $\alpha$-pinene. Using a Teflon reaction chamber (70 L), ultrafine ($>$3 nm dia.) particle formation was studied for $\alpha$-pinene concentrations between 1x10$^{-10}$ atm and 2.4x10$^{-8}$ atm at ozone concentrations between 1.2x10$^{-7}$ atm and 1.4x10$^{-6}$ atm. Experimental timescales of 40 minutes allowed appropriate time to investigate particle formation and subsequent growth of nanometer size particles. New information is presented regarding: 1) the effect of oxidizing agent (O$_{3}$ or OH) on aerosol mass yield and new particle concentration; 2) measurements performed near atmospherically relevant concentrations; and 3) the dependence of water vapor on the $\alpha$-pinene gas-phase oxidation mechanism and hygroscopic growth of new particles.
DE: 0305 Aerosols and particles (0345, 4801)
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting