An Experiment with an Advanced Surface Parameterization in a Mesobeta-Scale Model. Part I: Implementation

P. Bougeault Meteo-France, CNRM, Toulouse, France

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J. Noilhan Meteo-France, CNRM, Toulouse, France

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P. Lacarrère Meteo-France, CNRM, Toulouse, France

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P. Mascart Meteo-France, CNRM, Toulouse, France

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Abstract

As a follow-up to the HAPEX-MOBILHY experiment in southwestern France, an advanced parameterization of land-surface processes has been designed. This paper and two companions report on the implementation of this new parameterization in the limited-area model of the French Weather Service and on results obtained in the numerical simulation of one of the most widely studied periods of the experiment, 16 June 1986. In Part I, we discuss the production of maps of parameters to be used in the three-dimensional model. The useful parameters are produced by tabulation of their most probable values, as function of some primary parameters, which are for the present time the soil texture, the soil depth, the dominant vegetation type, and the albedo. The methods giving the maps of these primary parameters are also briefly discussed. They rely on existing information, such as several soil maps and satellite products from AVHRR and Meteostat. Parts II and III discuss the results of the simulation of 16 June 1986.

Abstract

As a follow-up to the HAPEX-MOBILHY experiment in southwestern France, an advanced parameterization of land-surface processes has been designed. This paper and two companions report on the implementation of this new parameterization in the limited-area model of the French Weather Service and on results obtained in the numerical simulation of one of the most widely studied periods of the experiment, 16 June 1986. In Part I, we discuss the production of maps of parameters to be used in the three-dimensional model. The useful parameters are produced by tabulation of their most probable values, as function of some primary parameters, which are for the present time the soil texture, the soil depth, the dominant vegetation type, and the albedo. The methods giving the maps of these primary parameters are also briefly discussed. They rely on existing information, such as several soil maps and satellite products from AVHRR and Meteostat. Parts II and III discuss the results of the simulation of 16 June 1986.

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