HR: 0800h
AN: A11A-0040    [Abstracts]
TI: How well does aerosol index represent the number of cloud condensation nuclei in global models?
AU: * Wang, M
EM: minghuai@umich.edu
AF: Department of Atmospheric, Oceanic, and Space Sciences, University of Michigan - Ann Arbor, 2455 Hayward St., Ann Arbor, MI 48109-2143, United States
AU: Penner, J
EM: penner@umich.edu
AF: Department of Atmospheric, Oceanic, and Space Sciences, University of Michigan - Ann Arbor, 2455 Hayward St., Ann Arbor, MI 48109-2143, United States
AU: Liu, X
EM: xiaohong.liu@pnl.gov
AF: Atmospheric Science & Global changes Division, Pacific Northwest National Laboratory, 3200 Q Ave., MSIN k9-24, Richland, WA 99352, United States
AB: Aerosol index (the product of Angstrom exponent and aerosol optical depth) has been used as a proxy for cloud condensation nuclei (CCN) to study cloud/aerosol interactions in global models and in satellite data. However, aerosol size, composition, and meteorological conditions can have different impacts on aerosol index and CCN. In this study, we investigate the correlation between aerosol index and number of CCN in a global climate- aerosol model. Several different configurations of aerosol model components are used: one with predicted aerosol mass only; one with both predicted aerosol mass and sulfate aerosol number; one with predicted aerosol mass and nitrate in aerosol. The effect of predicted sulfate aerosol size and nitrate aerosols on correlations between aerosol index and the number of CCN is examined.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0320 Cloud physics and chemistry
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting