HR: 1340h
AN: A23B-0782    [Abstracts]
TI: GCM asessment of aerosol-cloud interactions.
AU: * Nenes, A
EM: nenes@eas.gatech.edu
AF: Schools of Earth & Atmospheric Sciences and Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, GA 30332 United States
AU: Adams, P J
EM: petera@andrew.cmu.edu
AF: Departments of Civil & Environmental Engineering and Engineering & Public Policy, Carnegie Mellon University, Porter Hall 113, Carnegie Mellon University, Pittsburgh, PA 15213 United States
AU: Seinfeld, J H
EM: seinfeld@caltech.edu
AF: Departments of Chemical Engineering and Environmental Science & Engineering, California Institute of Technology, Mail Code 210-41 1200 East California Blvd., Pasadena, CA 91125 United States
AB: Aerosol-cloud interactions are assessed with the Goddard Institute for Space Studies GCM. Aerosol size distribution and chemical composition are resolved online with the TOMAS microphysics model (Adams and Seinfeld, 2002), while the aerosol-cloud interactions are based on an improved version of the Nenes and Seinfeld (2003) parameterization coupled with a new algorithm for estimating subgrid variability of updraft velocity. The aerosol-cloud interaction module is also coupled with autoconversion processes to assess the effects of aerosols on precipitation. The primary focus of this study will be the indirect forcing of sulfate and carbonaceous aerosol. {\bf References} Adams PJ, Seinfeld JH (2002) Predicting global aerosol size distributions in general circulation models, {\it J.Geoph.Res.}, {\bf 107} (D19): Art. No. 4370 Nenes, A. and Seinfeld, J.H. (2003) Parameterization of cloud droplet formation in global climate models, {\it J.Geoph.Res.}, {\bf 108} (D7), 4415, doi: 10.1029/2002JD002911
DE: 3319 General circulation
DE: 1610 Atmosphere (0315, 0325)
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0320 Cloud physics and chemistry
DE: 0345 Pollution--urban and regional (0305)
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting