HR: 10:35h
AN: A42B-02    [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
AU: Adams, P J
EM: petera@andrew.cmu.edu
AF: Departments of Civil & Environmental Engineering and Engineering & Public Policy, Carnegie Mellon University, Porter Hall 118L, Pittsburgh, PA 15213
AU: Seinfeld, J H
EM: seinfeld@caltech.edu
AF: Departments of Chemical Engineering and Environmental Science & Engineering, California Institute of Technology, 1200 E.California Blvd., Pasadena, CA 91125
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, while the aerosol-cloud interactions are based on an augmented version of the Nenes and Seinfeld (2003) activation parameterization (Fountoukis and Nenes, 2005) 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. We also assess the sensitivity of forcing estimates to organic solubility, molar volume and water vapor accommodation coefficient. References Adams PJ, Seinfeld JH (2002) Predicting global aerosol size distributions in general circulation models, J.Geoph.Res., 107 (D19): Art. No. 4370 Nenes, A. and Seinfeld, J.H. (2003) Parameterization of cloud droplet formation in global climate models, J.Geoph.Res., 108 (D7), 4415, doi: 10.1029/2002JD002911 Fountoukis, C. and A. Nenes, A. (2005) Continued Development of a Cloud Droplet Formation Parameterization for Global Climate Models, J.Geoph.Res.,110,D11212, doi:10.1029/2004JD005591
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0321 Cloud/radiation interaction
DE: 1626 Global climate models (3337, 4928)
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005