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A Weibull Distribution Based Technique for Downscaling of Climatic Wind Field

  • Mohamad Javad AlizadehEmail author
  • Mohamad Reza Kavianpour
  • Bahareh Kamranzad
  • Amir Etemad-Shahidi
Original Article

Abstract

This study proposes a simple approach based on Weibull distribution parameters for downscaling climatic wind speed and direction. In this method, the Weibull parameters of a Global Climate Model (GCM) are modified using Weibull parameters of the reference data (ECMWF). To correct the wind direction, the downscaling technique was applied to the eastward and northward wind components. All the wind components were simply transformed to positive values in order to fit a Weibull distribution. The unbiased wind speed was calculated by integrating the corrected wind components. Moreover, other models were considered to directly modify the wind speed (not wind components) using the same methodology. Performance and ability of the proposed approach were evaluated against the existing statistical downscaling techniques such as Multiplicative Shift Method (MSM), quantile mapping and support vector regression. In the models, the 6-h GCM wind component/speed was the sole predictor and the ECMWF reanalysis wind data was considered as the predictand. It is demonstrated that direct application of the proposed method on the wind speed slightly gives better estimation of the predictand rather than its application on wind components. The results indicate the Weibull distribution based method outperforms the other techniques for wind direction and magnitude. The method provides sound predictions for a wide range of wind speed from low to high values. By using the proposed downscaling technique for wind components, wind direction can be adjusted accordingly.

Keywords

Statistical downscaling Weibull parameters Wind direction Wind components Quantile mapping 

Notes

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Copyright information

© Korean Meteorological Society and Springer Nature B.V. 2019

Authors and Affiliations

  • Mohamad Javad Alizadeh
    • 1
    Email author
  • Mohamad Reza Kavianpour
    • 1
  • Bahareh Kamranzad
    • 2
    • 3
  • Amir Etemad-Shahidi
    • 4
    • 5
  1. 1.Faculty of Civil EngineeringK.N.Toosi University of TechnologyTehranIran
  2. 2.Disaster Prevention Research InstituteKyoto UniversityKyotoJapan
  3. 3.Hakubi Center for Advanced ResearchKyoto UniversityKyotoJapan
  4. 4.Griffith School of Engineering and Built EnvironmentGriffith UniversityGold CoastAustralia
  5. 5.School of EngineeringEdith Cowan UniversityJoondalupAustralia

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