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www.geosci-model-dev-discuss.net/4/2893/2011/
doi:10.5194/gmdd-4-2893-2011
© Author(s) 2011. This work is distributed
under the Creative Commons Attribution 3.0 License.
Importance of the surface size distribution of erodible material: an improvement of the Dust Entrainment And Deposition DEAD
1METEO-France, URA1357, CNRM/GAME, 42 av G. Coriolis, 31057 Toulouse, France
2Office National de la Météorologie (ONM), Algeria
3LACY, Université de La Réunion, 15 avenue René Cassin, 97715 Saint-Denis, France
4Laboratoire des Sciences Aéronautiques (Blida), Algeria
Abstract. This paper is based on dust aerosol cycle modelling in the atmospheric model ALADIN (Aire Limitée Adaptation dynamique Développement InterNational) coupled with the EXternalised SURFace scheme SURFEX. Its main goal is to create a global mineral dust emission parameterization compatible with the global database of land surface parameters ECOCLIMAP and the Food and Agriculture Organization (FAO) soil type database in SURFEX, based on both Shao (1993) and Marticorena and Bergametti (1995) parameterizations. An arrangement on the Dust Entrainment And Deposition scheme (DEAD) is proposed in this paper by introducing the geographic variation of surface size distribution, the Marticorena and Bergametti (1995) formulation of horizontal saltation flux and the Shao (2001) formulation of sandblasting efficiency α. To show the importance of the modifications introduced in the code DEAD, both sensitivity and comparative studies are realized in 0 dimensions (0-D) and then in 3 dimensions (3-D) between the old DEAD and that developed in this paper. The results in the 0-D simulations indicate that the developed DEAD scheme represents the dust source emission better, particularly in the Bodélé depression and provides a reasonable friction threshold velocity. In 3-D simulations, small differences are found between the DEAD and developed DEAD schemes for the simulated Aerosol Optical Depth (AOD) compared with the photometer AErosol RObotic NETwork (AERONET) measurements available in the African Monsoon Multidisciplinary Analyses (AMMA) databases. But, for the surface concentration a remarkable improvement is noted for the developed DEAD scheme.
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Notice on Discussion StatusCitation: Mokhtari, M., Gomes, L., Tulet, P., and Rezoug, T.: Importance of the surface size distribution of erodible material: an improvement of the Dust Entrainment And Deposition DEAD, Geosci. Model Dev. Discuss., 4, 2893-2936, doi:10.5194/gmdd-4-2893-2011, 2011. Bibtex EndNote Reference Manager XML
