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Korean Meteorological Society (한국기상학회)
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Evaluation of Reproduced Precipitation by WRF in the Region of CORDEX-East Asia Phase 2

CORDEX-동아시아 2단계 영역 재현실험을 통한 WRF 강수 모의성능 평가

  • Ahn, Joong-Bae (Division of Earth Environmental System, Pusan National University) ;
  • Choi, Yeon-Woo (Division of Earth Environmental System, Pusan National University) ;
  • Jo, Sera (Division of Earth Environmental System, Pusan National University)
  • 안중배 (부산대학교 지구환경시스템학부) ;
  • 최연우 (부산대학교 지구환경시스템학부) ;
  • 조세라 (부산대학교 지구환경시스템학부)
  • Received : 2017.12.26
  • Accepted : 2018.02.20
  • Published : 2018.03.31
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Abstract

This study evaluates the performance of the Weather Research and Forecasting (WRF) model in reproducing the present-day (1981~2005) precipitation over Far East Asia and South Korea. The WRF model is configured with 25-km horizontal resolution within the context of the COordinated Regional climate Downscaling Experiment (CORDEX) - East Asia Phase 2. The initial and lateral boundary forcing for the WRF simulation are derived from European Centre for Medium-Range Weather Forecast Interim reanalysis. According to our results, WRF model shows a reasonable performance to reproduce the features of precipitation, such as seasonal climatology, annual and inter-annual variabilities, seasonal march of monsoon rainfall and extreme precipitation. In spite of such model's ability to simulate major features of precipitation, systematic biases are found in the downscaled simulation in some sub-regions and seasons. In particular, the WRF model systematically tends to overestimate (underestimate) precipitation over Far East Asia (South Korea), and relatively large biases are evident during the summer season. In terms of inter-annual variability, WRF shows an overall smaller (larger) standard deviation in the Far East Asia (South Korea) compared to observation. In addition, WRF overestimates the frequency and amount of weak precipitation, but underestimates those of heavy precipitation. Also, the number of wet days, the precipitation intensity above the 95 percentile, and consecutive wet days (consecutive dry days) are overestimated (underestimated) over eastern (western) part of South Korea. The results of this study can be used as reference data when providing information about projections of fine-scale climate change over East Asia.

Keywords

References

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