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Statistical downscaling of near-surface wind over complex terrain in southern France

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Summary

Accurate and rapid determination of near-surface wind fields in a complex area (orography, inhomogeneous surface properties) is a challenge for applications like the evaluation of wind energy production, the prediction of pollution transport and hazardous conditions for aeronautics and ship navigation, or the estimation of damage to farm plantations, among others. This paper presents a statistical downscaling approach based on generalized additive models that provides accurate, rapid and relatively transparent simulations of local-scale near-surface wind field based on a method calibrated on both large-scale upper air and surface atmospheric fields. Our statistical method is used to downscale near-surface wind components to weather surface stations in southern France from ERA-40 reanalyses between 1991 and 2001. The region of interest is characterized by the presence of major mountain ranges which play a major role in redirecting large-scale circulations making difficult the prediction of local wind. This study compares the performance of our statistical approach with different sets of explanatory variables, to explain the near-surface wind field variability. The performances are interpreted by evaluating the contribution of the explanatory variables in the equations of motion. This approach generates accurate depictions of the local surface wind field, and allows to go one step further in statistical wind speed downscaling. Indeed, it is adapted to explain wind components and not only wind speed and energy in contrast to past studies and it is suited for complex terrain and robust to time averaging in this region.

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Authors and Affiliations

  1. Institut Pierre Simon Laplace/Laboratoire de Météorologie Dynamique, Ecole Polytechnique/ENS/UPMC/CNRS, Palaiseau, France

    T. Salameh & P. Drobinski

  2. Institut Pierre Simon Laplace/Laboratoire des Sciences du Climat et de l’Environnement, CEA/UVSQ/CNRS, Gif-sur-Yvette, France

    M. Vrac & P. Naveau

Authors
  1. T. Salameh
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  2. P. Drobinski
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  3. M. Vrac
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  4. P. Naveau
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Correspondence to T. Salameh.

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Correspondence: Tamara Salameh, Institut Pierre Simon Laplace/Laboratoire de Météorologie Dynamique, Ecole Polytechnique, 91128 Palaiseau Cédex, France

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Salameh, T., Drobinski, P., Vrac, M. et al. Statistical downscaling of near-surface wind over complex terrain in southern France. Meteorol Atmos Phys 103, 253–265 (2009). https://doi.org/10.1007/s00703-008-0330-7

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  • DOI: https://doi.org/10.1007/s00703-008-0330-7

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