HR: 1340h
AN: A53A-0848    [Abstracts]
TI: Development of a Regional Dust Transport Model: Preliminary Sensitivity Studies
AU: * MENUT, L
EM: menut@lisa.univ-paris12.fr
AF: LISA CNRS/Univ. Paris 12, CMC 61 av. du Gal de Gaulle, Creteil, 94010 France
AU: SCHMECHTIG, C
EM: schmechtig@lisa.univ-paris12.fr
AF: LISA CNRS/Univ. Paris 12, CMC 61 av. du Gal de Gaulle, Creteil, 94010 France
AU: MARTICORENA, B
EM: marticorena@lisa.univ-paris12.fr
AF: LISA CNRS/Univ. Paris 12, CMC 61 av. du Gal de Gaulle, Creteil, 94010 France
AU: CHATENET, B
EM: chatenet@lisa.univ-paris12.fr
AF: LISA CNRS/Univ. Paris 12, CMC 61 av. du Gal de Gaulle, Creteil, 94010 France
AU: CHIAPELLO, I
EM: chiapello@loa.univ-lille1.fr
AF: LOA Univ. Lille, Bat. P5, Villeneuve d'Ascq, 59655 France
AU: MOULIN, C
EM: cyril.moulin@cea.fr
AF: LSCE IPSL/CNRS/CEA, Orme des Merisiers, Gif sur Yvette, 91190 France
AB: The atmospheric transport of mineral dust is difficult to reproduce using global circulation model because their coarse spatial and temporal resolutions limit their ability to represent the small-scale processes that control the generation and the deposition of these particles. In the framework of a model/satellite intercomparison project, we are developing a new mineral dust transport model named CHIMERE-DUST. This model relies on the off-line chemistry-transport model CHIMERE and enables to generate concentration fields of mineral dust at high temporal (1h) and spatial (a few kilometers) resolutions for long time periods (several years). The modeled area include the dust sources of western Africa and the zone of long-range dust transport in the North Atlantic: from 1 degree to a few kilometers resolution, model domains are designed to perform nested simulations. Model simulations are compared to optical thicknesses measured by the PHOTONS-AERONET Network, to in-situ surface concentrations measurements and to satellite aerosol products (TOMS AI and METEOSAT optical Thickness). The accuracy of the results is discussed in term of sensitivity to the parameterizations implemented in the model for surface emission fluxes (depending on the parameterization employed, the sandblasting process used), for the number of dust bins (as well as the range values of these bins) used to account for the particle size distribution, and finally for the dry deposition.
DE: 3322 Land/atmosphere interactions
DE: 3367 Theoretical modeling
DE: 3307 Boundary layer processes
DE: 0305 Aerosols and particles (0345, 4801)
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting