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Atmospherical mesoscale models can offer unique potentialities tocharacterize and discriminate potential astronomical sites. Our team hasrecently completely validated the Meso-Nh model above Dome C (Lascaux et al.2009, 2010). Using all the measurements of CN2 profiles (15 nights) performedso far at Dome C during the winter time (Trinquet et al. 2008) we proved thatthe model can reconstruct, on rich statistical samples, reliable values of allthe three most important parameters characterizing the turbulence features ofan antarctic site: the surface layer thickness, the seeing in the freeatmosphere and in the surface layer. Using the same Meso-Nh model configurationvalidated above Dome C, an extended study is now on-going for other sites abovethe antarctic plateau, more precisely South Pole and Dome A. In thiscontribution we present the most important results obtained in the modelvalidation process and the results obtained in the comparison between differentastronomical sites above the internal plateau. The Meso-Nh model confirms itsability in discriminating between different optical turbulence behaviors, andthere is evidence that the three sites have different characteristics regardingthe seeing and the surface layer thickness. We highlight that this studyprovides the first homogeneous estimate, done with comparable statistics, ofthe optical turbulence developed in the whole 20-22 km above the ground at DomeC, South Pole and Dome A.

Optical turbulence: site selection above the internal Antarctic plateau with a mesoscale model