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Communication incl. Poster: BibTeX citation key:  Guyot
Guyot, A., Cohard, J.-M., Anquetin, S. & Galle, S. 2009. Three year time series of sensible and latent heat fluxes over a patchy savannah in West Africa using Large Aperture Scintillometer measurements. Work presented at Third International AMMA Conference, July 20—24, at Ouagadougou, Burkina Faso.
Added by: roussot 2009-11-04 17:40:06
Categories: Land surface processes
Creators: Anquetin, Cohard, Galle, Guyot
Publisher: African Monsoon Multidisciplinary Analyses (Ouagadougou, Burkina Faso)
Collection: Third International AMMA Conference

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In the context of the West African Monsoon, energy balance at the surface is expected to play a major role, but turbulent fluxes are often difficult to monitor over long period with sufficient accuracy. Within the framework of the “AMMA-CATCH” program, a Large Aperture Scintillometer (LAS) has been installed over a small catchment (12 km2 ), located in the north of Benin, a region exposed to sudanian climate.
This presentation will focus on the methodology we applied to derive the sensible heat flux from scintillometer measurements. For this, we need to characterize the annual cycle of aerodynamic parameters. More over, a footprint analysis has been carried through to precise the aggregation of local parameters needed in the computation of H.
Then, the result of a three years time series of sensible and latent heat fluxes will be presented and analysed. They are compared to local Eddy correlation measurements when they are available and aggregated net radiation measurements to analyse the energy balance partition.
For the first time, we dispose of a full year time series of aggregated sensible heat flux, which provide a complete annual cycle of AET at hour scale.
Added by: roussot