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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Importance of the surface size distribution of erodible material: An improvement on the dust entrainment and deposition (DEAD) model
Geoscientific Model Development, Volume 5, No. 3, Year 2012
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Description
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 an appropriate 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. An improvement on the Dust Entrainment And Deposition scheme (DEAD) is proposed in this paper by introducing the geographical variation of surface soil size distribution, the Marticorena and Bergametti (1995) formulation of horizontal saltation flux and the Shao et al. (1996) formulation of sandblasting efficiency
α
. To show the importance of the modifications introduced in the DEAD, both sensitivity and comparative studies are conducted in 0 dimensions (0-D) and then in 3 dimensions (3-D) between the old DEAD and the new DEAD. The results of the 0-D simulations indicate that the revised 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 the revised DEAD for the simulated Aerosol Optical Depth (AOD) compared with the AErosol RObotic NETwork (AERONET) photometer measurements available in the African Monsoon Multidisciplinary Analyses (AMMA) databases. For the surface concentration, a remarkable improvement is noted for the revised DEAD scheme. © Author(s) 2012.
Authors & Co-Authors
Mokhtari, Mohamed
France, Toulouse
Centre National de Recherches Météorologiques
Algeria, Algiers
Office National de la Météorologie
Gomes, Laurent
France, Toulouse
Centre National de Recherches Météorologiques
Tulet, Pierre
France, Toulouse
Centre National de Recherches Météorologiques
France, Saint-denis
Université de la Réunion
Rezoug, Tahar
Algeria, Blida
Université Blida 1
Statistics
Citations: 31
Authors: 4
Affiliations: 4
Identifiers
Doi:
10.5194/gmd-5-581-2012
ISSN:
1991959X
e-ISSN:
19919603
Research Areas
Environmental
Food Security
Mental Health