Atmos. Chem. Phys. Discuss., 11, 23655-23705, 2011
www.atmos-chem-phys-discuss.net/11/23655/2011/
doi:10.5194/acpd-11-23655-2011
© Author(s) 2011. This work is distributed
under the Creative Commons Attribution 3.0 License.
Review Status
This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
A continuous spectral aerosol-droplet microphysics model
Z. J. Lebo1 and J. H. Seinfeld1,2
1Environmental Science and Engineering, California Institute of Technology, Pasadena, 91125, CA, USA
2Chemical Engineering, California Institute of Technology, Pasadena, 91125, CA, USA

Abstract. A two-dimensional (2-D) continuous spectral aerosol-droplet microphysics model is presented and implemented into the Weather Research and Forecasting (WRF) model for large-eddy simulations (LES) of warm marine stratocumulus clouds. Activation and regeneration of aerosols are treated explicitly in the calculation of condensation/evaporation. The model includes a 2-D spectrum that encompasses wet aerosol particles (i.e. haze droplets), cloud droplets, and drizzle droplets in a continuous and consistent manner and allows for the explicit tracking of aerosol size within cloud droplets due to collision-coalescence. The system of differential equations describing condensation/evaporation (i.e. mass conservation and energy conservation) is solved simultaneously within each grid cell. The model is demonstrated by simulating a marine stratocumulus deck for two different aerosol loadings (100 and 500 cm−3), and comparison with the more traditional microphysics modeling approaches (both 1-D bin and bulk schemes) is evaluated.

Citation: Lebo, Z. J. and Seinfeld, J. H.: A continuous spectral aerosol-droplet microphysics model, Atmos. Chem. Phys. Discuss., 11, 23655-23705, doi:10.5194/acpd-11-23655-2011, 2011.
 
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