Development and testing of a desert dust module in a regional climate model

A. S. Zakey (1) , F. Solmon (2) , F. Giorgi (2)

1 Department of Chemistry, Atmospheric Science [Göteborg]
2 ICTP - Abdus Salam International Centre for Theoretical Physics [Trieste]

We develop a desert dust module and implement it within a regional climate model (RegCM). The dust module includes emission, transport, gravitational settling, wet and dry removal and calculations of dust optical properties. The coupled RegCM-dust model is applied to the simulation of two dust episodes over the Sahara region (a northeastern Africa dust outbreak, and a west Africa-Atlantic dust outbreak observed during the SHADE "Saharan Dust Experiment") as well as a three month simulation over an extended domain covering the Africa-Europe sector. Comparison with satellite and insitu (for SHADE) measurements shows that the model captures the main spatial (both horizontal and vertical) and temporal features of the dust distribution. The main model deficiency occurred in the SHADE case, when the model failed to accurately simulate the development of a mesoscale low associated with an easterly wave that contributed to the generation of the dust outbreak. The model appears suitable to conduct long term simulations of the effects of Saharan dust on African and European climate.

Domaines: Océan, Atmosphère

A. S. Zakey, F. Solmon, F. Giorgi. Development and testing of a desert dust module in a regional climate model. Atmospheric Chemistry and Physics Discussions, 2006, 6 (2), pp.1749-1792. ⟨hal-00301059⟩