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Theoretical and Applied Climatology

, Volume 84, Issue 1–3, pp 171–178 | Cite as

Sea-town interactions over Marseille: 3D urban boundary layer and thermodynamic fields near the surface

  • A. Lemonsu
  • G. Pigeon
  • V. Masson
  • C. Moppert
Article

Summary

3D numerical simulations with the Meso-NH atmospheric model including the Town Energy Balance urban parameterization, are conducted over the south-east of France and the one million inhabitants city of Marseille in the frameworks of the ESCOMPTE-UBL program. The geographic situation of the area is relatively complex, because of the proximity of the Mediterranean Sea and the presence of numerous massifs, inducing complex meteorological flows. The present work is focused on six days of the campaign, characterized by the development of strong summer sea-breeze circulations. A complete evaluation of the model is initially realized at both regional- and city-scales, by using the large available database. The regional evaluation shows a good behavior of the model, during the six days of simulation, either for the parameters near the surface or for the vertical profiles describing the structure of the atmosphere. The urban-scale evaluation indicates that the fine structure of the horizontal fields of air temperature above the city is correctly simulated by the model. A specific attention is then pointed to the 250-m horizontal resolution outputs, focused on the Marseille area, for two days of the campaign. From the study of the vertical structure of the Urban Boundary Layer and the thermodynamic fields near the surface, one underscores the important differences due to the regional and local flows, and the complex interactions that occur between the urban effects and the effects of sea breezes.

Keywords

Horizontal Resolution Vertical Structure Atmospheric Model Complete Evaluation Urban Effect 
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/Wien 2005

Authors and Affiliations

  • A. Lemonsu
    • 1
  • G. Pigeon
    • 1
  • V. Masson
    • 1
  • C. Moppert
    • 2
  1. 1.Centre National de Recherches MétéorologiquesMétéo-FranceFrance
  2. 2.Laboratoire d’Aérologie, Observatoire Midi-PyrénéesFrance

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