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Communication incl. Poster: BibTeX citation key:  Asencioa
Asencio, N., Lafore, J.-P., Boone, A., Guichard, F., Favot, F. & Redelsperger, J.-L. 2009. Land surface-atmosphere feedback analyze based on sensitivity experiments of cloud-resolving simulations on the 25-27 July 2006 convective period over Niamey. Work presented at Third International AMMA Conference, July 20—24, at Ouagadougou, Burkina Faso.
Added by: roussot 2009-11-23 21:39:12    Last Edited by: roussot 2010-01-06 13:04:54
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Categories: Atmospheric processes, Land surface processes, Land surface-atmosphere feedback
Creators: Asencio, Boone, Favot, Guichard, Lafore, Redelsperger
Publisher: African Monsoon Multidisciplinary Analyses (Ouagadougou, Burkina Faso)
Collection: Third International AMMA Conference

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Abstract
The 25-26 July period has been simulated at a 5 km-horizontal resolution with the MesoNH model. The reference simulation has been evaluated with a large AMMA-SOP dataset (see the presentation by Barthe et al. at this conference).
Sensitivity experiments have been performed with soil initial states produced by ALMIP (AMMA Land Surface Model Intercomparison Project). The main scenario: two successive propagating systems followed by local isolated convection, were not strongly impacted. The rainy regions were slightly shifted linked to wet boundary layer patch occurrences, but the total precipitation amount was not changed.
All of the MesoNH simulations well reproduced the main mechanisms identified by previous studies based on idealized simulations or on satellite-data observations: i.e. less cloud initiation over wet soil patches, wet boundary layer plumes in the lee of wet soil patches downwind of the monsoon flux, enhancement of the precipitation linked to these wet boundary layer patches.
The large horizontal domain (399x407) and a set of 48h-simulations allow statistical analysis to detect and to quantify the links between land-surface parameters, boundary-layer parameters and convective activity. Results of this ongoing statistical analysis will be presented at the conference.
Added by: roussot    Last Edited by: roussot