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Study of Bias-Correction in T213 Global Ensemble Forecast

LI Li~1 LI Yinglin~1 TIAN Hua~1 GUI Bo~2 1 National Meteorological Center,Beijing 100081 2 National Centers for Environmental Prediction.Maryland.U.S.A.  
In view of existence of model systematic error,a study of bias-correction has been done to estimate and reduce systematic error.One-moment bias-correction has been introduced in this paper.The merit of this method is that quantity of samples needed is smaller,thus estimation and bias-correction could be carried out quickly and economically.One-moment bias-correction towards T213 global ensemble forecast of 500 hPa height,850 hPa temperature and 2-m temperature has been done.Verification towards raw forecast and bias-corrected forecast shows that ensemble member homogeneity and cold bias have been improved,and ensemble mean RMSE and ACC also have been improved,especially bigger systematic error of 2-m temperature forecast has been improved obviously.
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