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Communication incl. Poster: BibTeX citation key:  Derimiana
Derimian, Y., Chiapello, I., Tanré, D., Leon, J.-F., Dubovik, O., Goloub, P., Letertre, J., Deuze, J.-L., Legrand, M., Brogniez, G., Brogniez, C., Buchard, V., Minvielle, F., Ducos, F., Auriol, F. & Podvin, T. 2010. Aerosol studies over Senegal and Atlantic in the framework of AMMA. Work presented at Atelier AMMA France 2010.
Added by: Fanny Lefebvre 2010-11-08 18:35:44    Last Edited by: Fanny Lefebvre 2010-11-08 18:36:07
Categories: General
Keywords: Aerosol
Creators: Auriol, Brogniez, Brogniez, Buchard, Chiapello, Derimian, Deuze, Dubovik, Ducos, Goloub, Legrand, Leon, Letertre, Minvielle, Podvin, Tanré
Publisher: African Monsoon Multidisciplinary Analyses
Collection: Atelier AMMA France 2010

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In the framework of AMMA we focused on aerosol characterization in western Africa. This region is strongly affected by desert dust and during the dry phase of the African monsoons by biomass burning aerosols. Variable size and absorbing properties of the aerosol particles can significantly perturb radiation reaching the surface and in the atmospheric layer, therefore affect convection and hydrological cycle.
A series of ground-based measurements, satellite observations, and numerical simulations was employed in order to characterize aerosol optical properties, vertical distributions and radiative effects. The involved ground-based observations are sun/sky photometer (AERONET/PHOTONS), operated by LOA broadband radiative flux measurements in solar and terrestrial spectrum, and a lidar system. The involved spaceborne instruments are MODIS, POLDER/PARASOL, and OMI. The conducted and ongoing observations supply data for already completed studies and for works in progress.
The completed studies showed: 1) representativeness of aerosol characteristics measured during AMMA in context of multi-year observations; 2) large-scale spatial variability of aerosol loading; 3) a multi-layer structures of aerosol vertical profiles during transport of biomass burning and mineral dust aerosols; 3) differences in size distribution and spectral absorption for dust and for events with the mixed aerosol type; 4) consequent perturbations of the measured at the surface broadband radiation; 5) numerically simulated aerosol radiative efficiency in presence of dust and biomass burning aerosols;
For the works in progress: 1) an analysis of POLDER/PARASOL and OMI aerosol observations, which are also compared with retrievals from AERONET/PHOTONS, will allow a better assessment of the reliability of aerosol size and absorption properties derived from current satellite sensors; 2) a comparison of PARASOL and MODIS retrievals over Atlantic suggests a need in combination of both sensors. It will allow more accurate deriving the dust size distribution and studying its evolution due to the deposition of the largest particles along the transport; 3) a comparison of the long-term simultaneous observations of solar and terrestrial broadband flux shows pronounced influence of dust in both spectrums. These observations will serve as an important component in estimation of relative importance of mineral dust warming effect in TIR and cooling effect in solar spectrum.
Added by: Fanny Lefebvre    Last Edited by: Fanny Lefebvre