Atmosphere (대기)

Korean Meteorological Society (한국기상학회)
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Objective analysis of temperature using the elevation-dependent weighting function

지형을 고려한 기온 객관분석 기법

  • Lee, Jeong-Soon (Forecast Research Laboratory, National Institute of Meteorological Research, KMA) ;
  • Lee, Yong Hee (Forecast Research Laboratory, National Institute of Meteorological Research, KMA) ;
  • Ha, Jong-Chul (Forecast Research Laboratory, National Institute of Meteorological Research, KMA) ;
  • Lee, Hee-Choon (Forecast Research Laboratory, National Institute of Meteorological Research, KMA)
  • 이정순 (기상청 국립기상연구소 예보연구과) ;
  • 이용희 (기상청 국립기상연구소 예보연구과) ;
  • 하종철 (기상청 국립기상연구소 예보연구과) ;
  • 이희춘 (기상청 국립기상연구소 예보연구과)
  • Received : 2011.12.14
  • Accepted : 2012.02.27
  • Published : 2012.06.30
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Abstract

The Barnes scheme is used in Digital Forecast System (DFS) of the Korea Meteorological Administration (KMA) for real-time analysis. This scheme is an objective analysis scheme with a distance-dependent weighted average. It has been widely used for mesoscale analyses in limited geographic areas. The isotropic Gaussian weight function with a constant effective radius might not be suitable for certain conditions. In particular, the analysis error can be increased for stations located near mountains. The terrain of South Korea is covered with mountains and wide plains that are between successive mountain ranges. Thus, it is needed to consider the terrain effect with the information of elevations for each station. In order to improve the accuracy of the temperature objective analysis, we modified the weight function which is dependent on a distance and elevation in the Barnes scheme. We compared the results from the Barnes scheme used in the DFS (referred to CTL) with the new scheme (referred to EXP) during a year of 2009 in this study. The analysis error of the temperature field was verified by the root-mean-square-error (RMSE), mean error (ME), and Priestley skill score (PSS) at the DFS observation stations which is not used in objective analysis. The verification result shows that the RMSE and ME values are 1.68 and -0.41 in CTL and 1.42 and -0.16 in EXP, respectively. In aspect of spatial verification, we found that the RSME and ME values of EXP decreased in the vicinity of Jirisan (Mt. Jiri) and Taebaek Mountains. This indicates that the new scheme performed better in temperature verification during the year 2009 than the previous scheme.

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References

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