HR: 17:00h
AN: A34A-05    [Abstracts]
TI: CCN Studies at Different Locations: Relative Importance of Aerosol Composition, Hygroscopicity and Mixing State
AU: Cubison, M
AF: Cooperative Institute for Research in the Environmental Sciences (CIRES), University of Colorado, 216 UCB, Boulder, CO 80309, United States
AU: * Ervens, B
EM: barbara.ervens@noaa.gov
AF: Colorado State University, Atmospheric Science Department, Fort Collins, CO 80523, United States
AU: * Ervens, B
EM: barbara.ervens@noaa.gov
AF: NOAA Earth Research System Laboratory, 325 Broadway, Boulder, CO 80309, United States
AU: Andrews, E
AF: Cooperative Institute for Research in the Environmental Sciences (CIRES), University of Colorado, 216 UCB, Boulder, CO 80309, United States
AU: Andrews, E
AF: NOAA Earth Research System Laboratory, 325 Broadway, Boulder, CO 80309, United States
AU: Feingold, G
AF: NOAA Earth Research System Laboratory, 325 Broadway, Boulder, CO 80309, United States
AU: Ogren, J
AF: NOAA Earth Research System Laboratory, 325 Broadway, Boulder, CO 80309, United States
AU: Jimenez, J L
AF: Cooperative Institute for Research in the Environmental Sciences (CIRES), University of Colorado, 216 UCB, Boulder, CO 80309, United States
AU: Jimenez, J L
AF: University of Colorado Dept. of Chemistry, UCB 216, Boulder, CO 80309, United States
AU: DeCarlo, P
AF: Cooperative Institute for Research in the Environmental Sciences (CIRES), University of Colorado, 216 UCB, Boulder, CO 80309, United States
AU: DeCarlo, P
AF: University of Colorado Dept. of Atmospheric and Oceanic Sciences, UCB 311, Boulder, CO 80309, United States
AU: Nenes, A
AF: Georgia Institute of Technology, Dept. of Earth and Atmospheric Sciences, Atlanta, GA 30332, United States
AU: Coe, H
AF: University of Manchester, School of Earth, Atmospheric and Environmental Science, Manchester, GBR M13 9PL,
AU: Allan, J
AF: University of Manchester, School of Earth, Atmospheric and Environmental Science, Manchester, GBR M13 9PL,
AU: Docherty, K
AF: Cooperative Institute for Research in the Environmental Sciences (CIRES), University of Colorado, 216 UCB, Boulder, CO 80309, United States
AU: Ulbrich, I
AF: Cooperative Institute for Research in the Environmental Sciences (CIRES), University of Colorado, 216 UCB, Boulder, CO 80309, United States
AU: Denkenberger, K
AF: University of California, San Diego, Department of Chemistry and Biochemistry, La Jolla, CA 92093, United States
AU: Prather, K
AF: University of California, San Diego, Department of Chemistry and Biochemistry, La Jolla, CA 92093, United States
AU: Snyder, D C
AF: University of Wisconsin, Dept of Civil and Environmental Engineering, Madison, WI 53706, United States
AU: Schauer, J J
AF: University of Wisconsin, Dept of Civil and Environmental Engineering, Madison, WI 53706, United States
AB: The level of understanding of the effect of aerosol particles on clouds, via their ability to act as cloud condensation nuclei (CCN), is low. Further analysis of the physical and chemical parameters influencing CCN activation is required in order to quantify these effects and allow parameterizations of these processes in large scale models. Using results from several recent field campaigns in both marine and urban environments, we explore the relationship between aerosol particles and their CCN activity. The data sets analyzed were acquired at Chebogue Point/Nova Scotia (ICARTT 2004), Riverside/California (SOAR 2005), and Point Reyes/California (MACE 2005). We discuss the extent to which detailed (size-resolved) information on aerosol composition, hygroscopic properties, and mixing state are required in order to predict CCN number concentration at a range of supersaturation levels. In addition to CCN predictions, we apply a cloud parcel model that is initialized with measured aerosol size distributions and the different composition descriptions developed for the Riverside data set. We use the cloud model results to evaluate how differences in aerosol composition and mixing state typical of an urban area translate into differences in cloud droplet concentrations and cloud optical properties.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0320 Cloud physics and chemistry
DE: 0365 Troposphere: composition and chemistry
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting