論文

査読有り
2019年11月1日

A Weibull Distribution Based Technique for Downscaling of Climatic Wind Field

Asia-Pacific Journal of Atmospheric Sciences
  • Mohamad Javad Alizadeh
  • ,
  • Mohamad Reza Kavianpour
  • ,
  • Bahareh Kamranzad
  • ,
  • Amir Etemad-Shahidi

55
4
開始ページ
685
終了ページ
700
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1007/s13143-019-00106-z

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.

リンク情報
DOI
https://doi.org/10.1007/s13143-019-00106-z
Scopus
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85061491238&origin=inward
Scopus Citedby
https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85061491238&origin=inward
ID情報
  • DOI : 10.1007/s13143-019-00106-z
  • ISSN : 1976-7633
  • eISSN : 1976-7951
  • SCOPUS ID : 85061491238

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