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

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Meteorological and Air Quality Models for Urban Areas

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Abstract

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.

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Authors and Affiliations

  1. Laboratoire de Mécanique des Fluides, UMR CNRS 6598, Ecole Centrale de Nantes, BP 92101, 44321, Nantes cedex 3, France

    Isabelle Calmet & Patrice Mestayer

Authors
  1. Isabelle Calmet
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  2. Patrice Mestayer
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Correspondence to Isabelle Calmet .

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Editors and Affiliations

  1. Danish Meteorological Institute, Lyngbyvej 100, Koebenhavn, 2100, Denmark

    Alexander Baklanov

  2. Dept. Geography, King's College London, Strand, London, WC2R 2LS, United Kingdom

    Grimmond Sue

  3. Danish Meteorological Institute, Lyngbyvej 100, Koebenhavn, 2100, Denmark

    Mahura Alexander

  4. Prediction and Research, Hadley Centre for Climate, Exeter, EXI 3PB, United Kingdom

    Maria Athanassiadou

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Calmet, I., Mestayer, P. (2009). Urban Soil-Canopy-Atmosphere Exchanges at Submesoscales: Learning from Model Development, Evaluation, and Coupling with LES. In: Baklanov, A., Sue, G., Alexander, M., Athanassiadou, M. (eds) Meteorological and Air Quality Models for Urban Areas. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-00298-4_6

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