HR: 0800h
AN: A41A-0010    [Abstracts]
TI: Measurements of Free Tropospheric Aerosol and Ice Nuclei at Storm Peak Laboratory with an Aerodyne Aerosol Mass Spectrometer (AMS)
AU: Huffman, J A
EM: alex.huffman@colorado.edu
AF: University of Colorado at Boulder CIRES, UCB 216, Boulder, CO 80309 United States
AU: * Dunlea, E
EM: edward.dunlea@colorado.edu
AF: University of Colorado at Boulder CIRES, UCB 216, Boulder, CO 80309 United States
AU: Aiken, A
EM: allison.aiken@colorado.edu
AF: University of Colorado at Boulder CIRES, UCB 216, Boulder, CO 80309 United States
AU: Gallar, C
EM: cgallar77@hotmail.com
AF: University of Colorado at Boulder CIRES, UCB 216, Boulder, CO 80309 United States
AU: Jimenez, J
EM: jose.jimenez@colorado.edu
AF: University of Colorado at Boulder CIRES, UCB 216, Boulder, CO 80309 United States
AU: Borys, R
EM: randolph.borys@dri.edu
AF: Storm Peak Laboratory Desert Research Institute, P.O. Box 770799, Steamboat Springs, CO 80477-0799 United States
AU: Cziczo, D
EM: djcziczo@al.noaa.gov
AF: Aeronomy Laboratory National Oceanic and Atmospheric Administration, 325 Broadway, Boulder, CO 80305 United States
AU: Murphy, D
EM: murphy@al.noaa.gov
AF: Aeronomy Laboratory National Oceanic and Atmospheric Administration, 325 Broadway, Boulder, CO 80305 United States
AU: Brooks, S
EM: sbrooks@lamar.colostate.edu
AF: Colorado State University, Department of Atmospheric Sciences, Fort Collins, CO 80523-1371 United States
AU: Richardson, M
EM: mattr@chem.atmos.colostate.edu
AF: Colorado State University, Department of Atmospheric Sciences, Fort Collins, CO 80523-1371 United States
AU: Prenni, A
EM: prenni@lamar.colostate.edu
AF: Colorado State University, Department of Atmospheric Sciences, Fort Collins, CO 80523-1371 United States
AU: Kreidenweis, S
EM: sonia@chem.atmos.colostate.edu
AF: Colorado State University, Department of Atmospheric Sciences, Fort Collins, CO 80523-1371 United States
AU: DeMott, P
EM: pdemott@lamar.colostate.edu
AF: Colorado State University, Department of Atmospheric Sciences, Fort Collins, CO 80523-1371 United States
AB: As part of the INSPECT II field campaign, a multi-institution research team spent six weeks in the spring of 2004 at a mountaintop laboratory with an extensive suite of aerosol measurement equipment including an Aerodyne Aerosol Mass Spectrometer (AMS). The Storm Peak Laboratory is located on the top of Mt. Werner on the grounds of Steamboat Springs ski resort at 10,530 feet above sea level. In the typical diurnal cycle westerly flow transports air up from the populated valley below during the day and free tropospheric air subsides over the site at night. We will present a characterization of the size dependent chemical composition of the background aerosol over the six week campaign from the AMS data. Our observations of the free tropospheric aerosol include the dominance of organics in its chemical composition and some nucleation and growth events. Comparisons will also be made of aerosol composition data provided by two different mass spectrometric techniques (AMS and Particle Analysis by Laser Mass Spectrometry (PALMS)). In addition, several distinct events were observed including the outflow from a wild fire in the Poudre Canyon near Fort Collins in Colorado's Front Range. Lastly, the AMS was used to help characterize the chemical composition of ice nuclei, selected by a Continuous Flow Diffusion Chamber - Counter flow Virtual Impactor (CFDC - CVI).
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0320 Cloud physics and chemistry
DE: 0365 Troposphere--composition and chemistry
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting