Atmos. Chem. Phys. Discuss., 11, 26477-26520, 2011
www.atmos-chem-phys-discuss.net/11/26477/2011/
doi:10.5194/acpd-11-26477-2011
© 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.
Simulation of mineral dust aerosol with piecewise log-normal approximation (PLA) in CanAM4-PAM
Y. Peng1, K. von Salzen2, and J. Li2
1Canadian Centre for Climate Modelling and Analysis, School of Earth and Ocean Sciences, University of Victoria, Victoria, BC, V8W 3P6, Canada
2Canadian Centre for Climate Modelling and Analysis, Environment Canada, Victoria, BC, V8W 3P6, Canada

Abstract. A new size-resolved dust scheme based on the numerical method of piecewise log-normal approximation (PLA) was developed and implemented in the fourth generation of the Canadian Atmospheric Global Climate Model with the PLA Aerosol Module (CanAM4-PAM). The total simulated annual mean dust burden is 37.8 mg m−2 for year 2000, which is consistent with estimates from other models. Results from simulations are compared with multiple surface measurements near and away from dust source regions, validating the generation, transport and deposition of dust in the model. Most discrepancies between model results and surface measurements are due to unresolved aerosol processes. Radiative properties of dust aerosol are derived from approximated parameters in two size modes using Mie theory. The simulated aerosol optical depth (AOD) is compared with several satellite observations and shows good agreements. The model yields a dust AOD of 0.042 and total AOD of 0.126 for the year 2000. The simulated aerosol direct radiative forcings (ADRF) of dust and total aerosol over ocean are −1.24 W m−2 and −4.76 W m−2 respectively, which show good consistency with satellite estimates for the year 2001.

Citation: Peng, Y., von Salzen, K., and Li, J.: Simulation of mineral dust aerosol with piecewise log-normal approximation (PLA) in CanAM4-PAM, Atmos. Chem. Phys. Discuss., 11, 26477-26520, doi:10.5194/acpd-11-26477-2011, 2011.
 
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