HR: 0800h
AN: A51E-0835    [Abstracts]
TI: Size Resolved CCN Spectra Measured During the FACE2004 Field Experiment in Central Germany
AU: * Hildebrandt, L
EM: lea@caltech.edu
AF: Department of Chemical Engineering, California Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125 United States
AU: Dusek, U
EM: dusek@mpch-mainz.mpg.de
AF: Max Planck Institute for Chemistry, P.O. Box 3060, Mainz, D-55020 Germany
AU: Frank, G P
EM: gfrank@mpch-mainz.mpg.de
AF: Max Planck Institute for Chemistry, P.O. Box 3060, Mainz, D-55020 Germany
AU: Curtius, J
EM: curtius@uni-mainz.de
AF: Institute for Atmospheric Physics, Johannes Gutenberg University, Postfach, Mainz, D-55099 Germany
AU: Drewnick, F
EM: drewnick@mpch-mainz.mpg.de
AF: Max Planck Institute for Chemistry, P.O. Box 3060, Mainz, D-55020 Germany
AU: Walter, S
EM: walter@mpch-mainz.mpg.de
AF: Max Planck Institute for Chemistry, P.O. Box 3060, Mainz, D-55020 Germany
AU: Juergens, N
EM: juergens@mpch-mainz.mpg.de
AF: Max Planck Institute for Chemistry, P.O. Box 3060, Mainz, D-55020 Germany
AU: Juergens, N
EM: juergens@mpch-mainz.mpg.de
AF: Institute for Landscape Ecology, University of Muenster, Schlossplatz 2, Muenster, D-48149 Germany
AU: Kuerten, A
EM: kuerten@uni-mainz.de
AF: Institute for Atmospheric Physics, Johannes Gutenberg University, Postfach, Mainz, D-55099 Germany
AU: Schneider, J
EM: schneider@mpch-mainz.mpg.de
AF: Max Planck Institute for Chemistry, P.O. Box 3060, Mainz, D-55020 Germany
AU: Borrmann, S
EM: borrmann@mpch-mainz.mpg.de
AF: Max Planck Institute for Chemistry, P.O. Box 3060, Mainz, D-55020 Germany
AU: Borrmann, S
EM: borrmann@mpch-mainz.mpg.de
AF: Institute for Atmospheric Physics, Johannes Gutenberg University, Postfach, Mainz, D-55099 Germany
AU: Andreae, M O
EM: andreae@mpch-mainz.mpg.de
AF: Max Planck Institute for Chemistry, P.O. Box 3060, Mainz, D-55020 Germany
AB: The FACE 2004 field experiment took place at the Taunus Observatory (Kleiner Feldberg, central Germany) in July and August 2004. As part of this project we measured cloud condensation nuclei (CCN) in various air mass conditions, including recent pollution from the industrialized Rhein - Main area, aged pollution from Eastern Europe, and relatively clean air of marine origin. We measured CCN efficiencies (i.e., CCN divided by total particle concentration) as a function of supersaturation (S) at different particle diameters, which were selected by a differential mobility analyzer upstream of the CCN counter. The method of measuring size dependent CCN spectra gives more detailed information than measurements without size resolution. It simplifies closure studies with particle chemical composition, which we determined at the same particle diameters by a Quadrupole Aerosol Mass Spectrometer. By combining these size dependent CCN spectra with aerosol number size distributions, the size distributions of CCN can be derived for a given S. We will present first results on the FACE 2004 CCN measurements, namely a comparison of CCN efficiencies and CCN size distributions in different air mass conditions and the relationship of particle chemistry to the CCN efficiencies of each selected size fraction.
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0320 Cloud physics and chemistry
DE: 0345 Pollution--urban and regional (0305)
DE: 0365 Troposphere--composition and chemistry
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting