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Abstract

An exercise is described aiming at the comparison of the results of seven mesoscale models used for the simulation of an ideal circulation case. The exercise foresees the simulation of the flow over an ideal sea�land interface including ideal topography in order to verify model deviations on a controlled case.

All models involved use the same initial and boundary conditions, circulation and temperature forcings as well as grid resolution in the horizontal and simulate the circulation over a 24-h period of time. The model differences at start are reduced to the minimum by the case specification and consist mainly of the parameterisation and numerical formulation of the fundamental equations of the atmospheric flow.

The exercise reveals that despite the reduction of the differences in the case configuration, the differences in model results are still remarkable. An ad hoc investigation using one model of the original seven identifies the treatment of the boundary conditions, the parameterisation of the horizontal diffusion and of the surface heat flux as the main cause for the model deviations. The analysis of ideal cases represents a revealing and interesting exercise to be performed after the validation of models against analytical solution but prior to the application to real cases.

Additional information

Authors: THUNIS P, European Commission, Joint Research Centre, Institute for Environment and Sustainability, Ispra (IT);GALMARINI S, European Commission, Joint Research Centre, Institute for Environment and Sustainability, Ispra (IT);MARTILLI A, LPAS-IGE-DGR, EPFL, Lausanne (CH);CLAPPIER A, LPAS-IGE-DGR, EPFL, Lausanne (CH);ANDRONOPOULOS S, Environmental Research Laboratory, Institute of Nuclear Technology and Radiation Protection, Aghia Paraskevi (GR);BARTZIS J, Environmental Research Laboratory, Institute of Nuclear Technology and Radiation Protection, Aghia Paraskevi (GR);VLACHOGIANNIS D, Environmental Research Laboratory, Institute of Nuclear Technology and Radiation Protection, Aghia Paraskevi (GR);DE RIDDER K, Flemish Institute for Technological Research (Vito), Mol (BE);MOUSSIOPOULOS N, Laboratory of Heat Transfer and Environmental Engineering, Aristotle University, Thessaloniki, (GR);SAHM P, Laboratory of Heat Transfer and Environmental Engineering, Aristotle University, Thessaloniki, (GR);ALMBAUER R, Technical University of Graz, Institute of Internal Combustion Engines and Thermodynamics, Graz (AT);STURM P, Technical University of Graz, Institute of Internal Combustion Engines and Thermodynamics, Graz (AT);OETTL D, Technical University of Graz, Institute of Internal Combustion Engines and Thermodynamics, Graz (AT);DIERER S, Meteorological Institute, Centre for Marine and Climate Research, University of Hamburg (DE);SCHLÜNZEN K H, Meteorological Institute, Centre for Marine and Climate Research, University of Hamburg (DE)
Bibliographic Reference: An article published in: Atmospheric Environment, Volume 37, Issue 3 , (January 2003) , pp.363-382
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://dx.doi.org/10.1016/S1352-2310%2902%2900888-9
Record Number: 200316053 / Last updated on: 2003-03-13
Category: PUBLICATION
Original language: en
Available languages: en