AAAR 31st Annual Conference
October 8-12, 2012
Hyatt Regency Minneapolis
Minneapolis, Minnesota, USA
Abstract View
Studying the Climate Impact of Landuse Change at Fine Scale
Peng Liu, Yongtao Hu, ATHANASIOS NENES, Armistead Russell, Georgia Institute of Technology
Abstract Number: 404 Working Group: Aerosols, Clouds, and Climate
Abstract Aerosol from biomass burning, which is rich in black carbon and organic compounds, is a major contributor to the particulate matters over Southeast USA, and may have significant feedbacks to regional climate through the direct and indirect effects.
In this study, the cloud droplet activation parameterization of Kumar et al.(2009), which considers the competition between soluble and in soluble aerosols for water vapor during cloud droplet formation in ascending air parcels, is implemented in WRF-Chem. The water uptake properties of the biomass burning aerosol (required for predicting optical depth for direct radiative forcing, and CCN activity for indirect effects) are constrained using observations of fresh and aged biomass burning aerosol sampled during the 2008 ARctas campaign (Jacob et al., 2010). We first couple the aerosol module only with radiation module to estimate direct effect, and then with microphysics module for the indirect effect.
References:
Kumar, P., Sokolik, I.N., and Nenes, A. (2009) Parameterization of Cloud Droplet Formation for Global and Regional models: Including Adsorption Activation from Insoluble CCN., Atmos. Chem. Phys., 9, 2517-2532
Jacob, D. J., Crawford, J. H., Maring, H., Clarke, A. D., Dibb, J. E., Emmons, L. K., Ferrare, R. A., Hostetler, C. A., Russell, P. B., Singh, H. B., Thompson, A. M., Shaw, G. E., McCauley, E., Pederson, J. R., and Fisher, J. A. (2010): The Arctic Research of the Composition of the Troposphere from Aircraft and Satellites (ARCTAS) mission: design, execution, and first results, Atmos. Chem. Phys., 10, 5191-5212, doi:10.5194/acp-10-5191-2010