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Atmospheric Chemistry and Physics Simulation of mineral dust aerosol with Piecewise Log-normal Approximation (PLA) in CanAM4-PAM
, 2012
"... 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 gener-ation of the Canadian Atmospheric Global Climate Model with the PLA Aerosol Model (CanAM4-PAM). The total simulated annual global dust ..."
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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 gener-ation 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−1, and the dust mass load is 19.3 Tg for year 2000. Both are consis-tent with estimates from other models. Results from simula-tions are compared with multiple surface measurements near and away from dust source regions, validating the genera-tion, transport and deposition of dust in the model. Most dis-crepancies 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 forc-ing (ADRF) of −1.24 W m−2 respectively, which show good consistency with model estimates from other studies. 1
Bay of Bengal and the Arabian Sea region during ICARB using
, 2012
"... Examination of aerosol distributions and radiative effects over the ..."
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© Author(s) 2012. CC Attribution 3.0 License. Atmospheric Chemistry and Physics The isotopic record of Northern Hemisphere atmospheric carbon monoxide since 1950: implications for the CO budget
, 2012
"... doi:10.5194/acp-12-4365-2012 ..."
Table of contents
, 2008
"... Photo and illustration credits © IfT; all pages, except for pages: ..."
Atmospheric Chemistry and Physics Global dust model intercomparison in AeroCom phase I
"... doi:10.5194/acp-11-7781-2011 ..."
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Atmospheric Chemistry and Physics The Mineral Dust Cycle in EMAC 2.40: sensitivity to the spectral resolution and the dust emission scheme
, 2012
"... Abstract. This first detailed analysis of the mineral dust cycle in the ECHAM5/MESSy Atmospheric Chemistry (EMAC) model system investigates the performance of two dust emission schemes, following the approach of Balkanski et al. (2004) and Tegen et al. (2002), respectively, and the influence of the ..."
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Abstract. This first detailed analysis of the mineral dust cycle in the ECHAM5/MESSy Atmospheric Chemistry (EMAC) model system investigates the performance of two dust emission schemes, following the approach of Balkanski et al. (2004) and Tegen et al. (2002), respectively, and the influence of the horizontal model resolution. Here the spec-tral resolutions T42, T63, T85, and T106 are investigated. A basic sulphur chemistry, enabling the coating of insoluble dust particles to make them soluble, is employed in order to realistically describe the ageing and wet deposition of min-eral dust. Independent of the dust emission scheme the five-year simulations with the horizontal resolutions T42 and T63 produce unrealistically high emissions at some grid points in the Tarim Basin in Central Asia, leading to very high dust loads in polar regions. With these coarse resolutions, dust
