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BodEx 2005 - Measurements and observations in northern Chad (Bodélé/Djourab)

Objectives

The overall aims are to (i) improve our understanding of the processes of dust emission and transport from the Bodélé and (ii) the charcateristics of dust aerosols which determine the radiative forcing. In doing so we hope to contribute to the effort to simulate dust emission and its climatic impact. The research team includes expertise in climatology, meteorology, remote sensing, geomorphology and geophysics.

The objectives are to determine:

  1. the nature of the boundary layer meteorology (notably the low level jet feature) controlling dust production. We are especially interested in the diurnal variability;
  2. how the local scale climate is influenced by the large scale circulation during dust events;
  3. the ability of regional and global climate models (including the reanalyses data sets) to represent the local and regional meteorology;
  4. the effect of dust on the surface radiation budget;
  5. the optical and physical properties of mineral dust aerosols through high quality in-situ measurements;
  6. the consistency between in-situ and satellite estimates of aerosol optical properties;
  7. the distribution and physical/chemical composition of the sediments that release dust; and
  8. The microscale processes of dust production, notably the role of sand bombardment and the spatial pattern of the production of dust at the 1m to 1000m scales.