HR: 1340h
AN: A33A-0829    [Abstracts]
TI: CCN Properties of Water-Soluble Organics Collected From PILS During GoMACCS 2006
AU: * Asa-Awuku, A
EM: akua.asa-awuku@chbe.gatech.edu
AF: Georgia Institute of Technology, 311 Ferst Drive, Atlanta, GA 30332-0100, United States
AU: Nenes, A
EM: nenes@eas.gatech.edu
AF: Georgia Institute of Technology, 311 Ferst Drive, Atlanta, GA 30332-0100, United States
AU: Sorooshian, A
EM: armin@caltech.edu
AF: California Institute of Technology, Mail Code 210-41, Pasadena, CA 91225, United States
AU: Flagan, R C
EM: flagan@cheme.caltech.edu
AF: California Institute of Technology, Mail Code 210-41, Pasadena, CA 91225, United States
AU: Seinfeld, J H
EM: seinfeld@caltech.edu
AF: California Institute of Technology, Mail Code 210-41, Pasadena, CA 91225, United States
AB: By behaving as cloud condensation nuclei (CCN) that may enhance cloud reflectivity and lifetime, aerosols can have significant impacts on global and regional cloud formation. Little is understood about the composition and characteristics of these aerosols necessary to model droplet growth. In this study we investigate the CCN activity of aerosols obtained from a particle-in-liquid sampler (PILS) during the Gulf of Mexico Atmospheric Composition and Climate Study (GoMACCs) in 2006. A sampling and experimental strategy is employed to characterize and understand differences in aerosols that have been activated within cloud regions (top, middle, and bottom) and below cloud regions influenced by urban and industrial plumes. Aerosols are collected through a PILS either after a counter-flow virtual impactor (CVI) when in-cloud or directly from the sample when out-of-cloud. Particular emphasis will be placed on the impact of organics on growth kinetics and the ability to achieve CCN activity closure based on resolved speciation.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
DE: 3311 Clouds and aerosols
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting