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1 CEP-Sophia CEP - Centre Énergétique et Procédés 2 Meteotest 3 CEP - Centre Énergétique et Procédés

Abstract : This work explores the possibility of integrating the geographical elements such as orography and presence of water bodies as well as the latitudinal effects into an effective distance when interpolating meteorological fields. This effective distance may then be used in any interpolation methods instead of the standard geodetic distance. Several hundreds of sites are used in Europe to assess the benefits of several effective distances. The meteorological parameters under concern are ten-years averages of monthly means of daily sum of horizontal global irradiation, daily sum of sunshine duration, daily extremes of air temperature, atmospheric pressure and water vapor pressure, and of monthly sums of precipitation. This work demonstrates that taking into account the latitudinal effects in the distance increases the accuracy in interpolation. Such effects have been seldom mentioned in previous publications. The orographic effects may be partly corrected by adding the weighted difference in elevation to the geodetic distance. The proposed effective distance between the point P and each of the measuring sites Xi for all parameters, is found to give better results than the others.

Author: Mireille Lefèvre - Jan Remund - Michel Albuisson - Lucien Wald -



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