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        Regional modelling of Saharan dust and biomass-burning smoke. Part 1 : Model description and evaluation

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        Author
        Heinold, Bernd
        Tegen, Ina
        Schepanski, Kerstin
        Tesche, Matthias
        Esselborn, Michael
        Freudenthaler, Volker
        Gross, Silke
        Kandler, Konrad
        Knippertz, Peter
        Mueller, D.
        Schladitz, Alexander
        Toledano, Carlos
        Weinzierl, Bernadett
        Ansmann, Albert
        Althausen, Dietrich
        Müller, Thomas
        Petzold, Andreas
        Wiedensohler, Alfred
        Attention
        2299/11250
        Abstract
        The spatio-temporal evolution of the Saharan dust and biomass-burning plume during the SAMUM-2 field campaign in January and February 2008 is simulated at 28 km horizontal resolution with the regional model-system COSMO-MUSCAT. The model performance is thoroughly tested using routine ground-based and space-borne remote sensing and local field measurements. Good agreement with the observations is found in many cases regarding transport patterns, aerosol optical thicknesses and the ratio of dust to smoke aerosol. The model also captures major features of the complex aerosol layering. Nevertheless, discrepancies in the modelled aerosol distribution occur, which are analysed in detail. The dry synoptic dynamics controlling dust uplift and transport during the dry season are well described by the model, but surface wind peaks associated with the breakdown of nocturnal low-level jets are not always reproduced. Thus, a strong dust outbreak is underestimated. While dust emission modelling is a priori more challenging, since strength and placement of dust sources depend on on-line computed winds, considerable inaccuracies also arise in observation-based estimates of biomass-burning emissions. They are caused by cloud and spatial errors of satellite fire products and uncertainties in fire emission parameters, and can lead to unrealistic model results of smoke transport. © 2011 The Authors Tellus B © 2011 John Wiley & Sons A/S.
        Publication date
        2011-09
        Published in
        Tellus Series B-Chemical and Physical Meteorology
        Published version
        https://doi.org/10.1111/j.1600-0889.2011.00570.x
        Other links
        http://hdl.handle.net/2299/11250
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