ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-12-6891-2012 Simulation of mineral dust aerosol with Piecewise Log-normal Approximation (PLA) in CanAM4-PAM Peng Y. 1 von Salzen K. 2 Li J. 2 School of Earth and Ocean Sciences, University of Victoria, Victoria, British Columbia, Canada Canadian Centre for Climate Modelling and Analysis, Environment Canada, Victoria, British Columbia, Canada 01 08 2012 12 15 6891 6914 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/12/6891/2012/acp-12-6891-2012.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/12/6891/2012/acp-12-6891-2012.pdf

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 Model (CanAM4-PAM). The total simulated annual global dust emission is 2500 Tg yr<sup>−1</sup>, and the dust mass load is 19.3 Tg for year 2000. Both are 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. Biases in long-range transport are also contributing. 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 satellite and surface remote sensing measurements and shows general agreement in terms of the dust distribution around sources. The model yields a dust AOD of 0.042 and dust aerosol direct radiative forcing (ADRF) of −1.24 W m<sup>−2</sup> respectively, which show good consistency with model estimates from other studies.

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