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An Assessment of Bayesian Bias Estimator for Numerical Weather Prediction : Volume 15, Issue 6 (16/12/2008)

By Son, J.

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Book Id: WPLBN0003985274
Format Type: PDF Article :
File Size: Pages 10
Reproduction Date: 2015

Title: An Assessment of Bayesian Bias Estimator for Numerical Weather Prediction : Volume 15, Issue 6 (16/12/2008)  
Author: Son, J.
Volume: Vol. 15, Issue 6
Language: English
Subject: Science, Nonlinear, Processes
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Toth, Z., Son, J., & Hou, D. (2008). An Assessment of Bayesian Bias Estimator for Numerical Weather Prediction : Volume 15, Issue 6 (16/12/2008). Retrieved from

Description: Numerical Prediction Center KMA, Seoul, Korea. Various statistical methods are used to process operational Numerical Weather Prediction (NWP) products with the aim of reducing forecast errors and they often require sufficiently large training data sets. Generating such a hindcast data set for this purpose can be costly and a well designed algorithm should be able to reduce the required size of these data sets.

This issue is investigated with the relatively simple case of bias correction, by comparing a Bayesian algorithm of bias estimation with the conventionally used empirical method. As available forecast data sets are not large enough for a comprehensive test, synthetically generated time series representing the analysis (truth) and forecast are used to increase the sample size. Since these synthetic time series retained the statistical characteristics of the observations and operational NWP model output, the results of this study can be extended to real observation and forecasts and this is confirmed by a preliminary test with real data.

By using the climatological mean and standard deviation of the meteorological variable in consideration and the statistical relationship between the forecast and the analysis, the Bayesian bias estimator outperforms the empirical approach in terms of the accuracy of the estimated bias, and it can reduce the required size of the training sample by a factor of 3. This advantage of the Bayesian approach is due to the fact that it is less liable to the sampling error in consecutive sampling. These results suggest that a carefully designed statistical procedure may reduce the need for the costly generation of large hindcast datasets.

An assessment of Bayesian bias estimator for numerical weather prediction

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