Urban Soil-Canopy-Atmosphere Exchanges at Submesoscales: Learning from Model Development, Evaluation, and Coupling with LES

  • Isabelle CalmetEmail author
  • Patrice Mestayer


The Soil Model for Sub-Mesoscales Urban version (SM2U) can be used as a stand-alone urban climatology model or as a boundary conditioning model in atmospheric codes. It is presented here by pointing out the specific parameterizations which make it differ from classical surface energy budget models. This paper relates the experience gained by performing validation exercises in documented meteorological situations for both the hydric and the thermal parts of the model, and sensitivity studies aimed at disclosing the relative efficiency of the different parameterizations (wall conduction, radiative trapping…). The SM2U model is then shown a very useful tool for small-scale climatology mainly due to the coupled computation of water and energy budgets. The atmospheric response to the SM2U ground forcing is also evaluated when coupled with a LES model, for different description modes of a coastal city. The heterogeneity of the districts and a fine description of the city are shown very important in the realistic assessment of the atmospheric lower layers, even in very complex situations including orography and sea influences.


Atmospheric Boundary Layer Canopy Temperature Surface Energy Budget Building Wall Thermal Internal Boundary Layer 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  1. 1.Laboratoire de Mécanique des FluidesUMR CNRS 6598, Ecole Centrale de NantesNantes cedex 3France

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