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Communication incl. Poster: BibTeX citation key:  Rochetin
Rochetin, N., Grandpeix, J.-Y. & Cerlini, P. 2009. A study of moist convection sensitivity to surface-boundary-conditions based on CRM and SCM simulations. Work presented at Third International AMMA Conference, July 20—24, at Ouagadougou, Burkina Faso.
Added by: roussot 2009-11-24 19:55:10
Categories: Atmospheric processes, Land surface-atmosphere feedback
Keywords: Atmospheric Boundary Layer, Clouds - Convection
Creators: Cerlini, Grandpeix, Rochetin
Publisher: African Monsoon Multidisciplinary Analyses (Ouagadougou, Burkina Faso)
Collection: Third International AMMA Conference

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Popularity index:  38.1%
Maturity index:  published

Coupling between deep convection and surface processes remains an important source of uncertainty for GCMs, especially the role of soil humidity concerning convection triggering and propagation. Thanks to passive micro-wave data, Chris Taylor recently showed that convection is sensitive to surface-humidity inhomogenities; the convective systems seem to initiate and propagate along the strong-gradient-lines of soil moisture.
The aim of our study is to propose a better quantification of the surface-convection interaction: for this we will use the single column model (SCM) associated to the LMD's GCM (LMDZ4) and the Cloud Resolving Model (CRM) ARPS used in the College University of Perrugia.
The first step is to compare SCM and CRM's simulations in a radiative-convective equilibrium case. Such simulations of oceanic cases have already been done in the past (Robe and Emanuel 1996, Tompkins 2000, Bretherton and Khairoutdinov 2005) ; we will extend this study to continental cases also. Firstly, the atmosphere will not be coupled with the soil: the surface temperature will be maintained constant. We shall study the sensitivity of convection to boundary conditions (i.e. the surface temperature, the rugosity and the ratio beta of effective evaporation by potential evaporation).
In a second step the atmosphere will be coupled with a thermal-conduction soil model. Comparing the uncoupled response with the coupled one will make it possible to quantify the surface-convection feedback.
Added by: roussot