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Accuracy Assessment of Planetary Boundary Layer Height for the WRF Model Using Temporal High Resolution Radio-sonde Observations

시간 고해상도 라디오존데 관측 자료를 이용한 WRF 모델 행성경계층고도 정확도 평가

  • Kang, Misun (Applied Meteorology Research Division, National Institute of Meteorological Sciences) ;
  • Lim, Yun-Kyu (Applied Meteorology Research Division, National Institute of Meteorological Sciences) ;
  • Cho, Changbum (Applied Meteorology Research Division, National Institute of Meteorological Sciences) ;
  • Kim, Kyu Rang (Applied Meteorology Research Division, National Institute of Meteorological Sciences) ;
  • Park, Jun Sang (Applied Meteorology Research Division, National Institute of Meteorological Sciences) ;
  • Kim, Baek-Jo (Applied Meteorology Research Division, National Institute of Meteorological Sciences)
  • 강미선 (국립기상과학원 응용기상연구과) ;
  • 임윤규 (국립기상과학원 응용기상연구과) ;
  • 조창범 (국립기상과학원 응용기상연구과) ;
  • 김규랑 (국립기상과학원 응용기상연구과) ;
  • 박준상 (국립기상과학원 응용기상연구과) ;
  • 김백조 (국립기상과학원 응용기상연구과)
  • Received : 2016.09.29
  • Accepted : 2016.11.15
  • Published : 2016.12.31

Abstract

Understanding limitation of simulation for Planetary Boundary Layer (PBL) height in mesoscale meteorological model is important for accurate meteorological variable and diffusion of air pollution. This study examined the accuracy for simulated PBL heights using two different PBL schemes (MYJ, YSU) in Weather Research and Forecasting (WRF) model during the radiosonde observation period. The simulated PBL height were verified using atmospheric sounding data obtained from radiosonde observations that were conducted during 5 months from August to December 2014 over the Gumi weir in Nakdong river. Four Dimensional Data Assimilation (FDDA) using radiosonde observation data were conducted to reduce error of PBL height in WRF model. The assessment result of PBL height showed that RMSE with YSU scheme were lower than that with MYJ scheme in the day and night time, respectively. Especially, the WRF model with YSU scheme produced lower PBL height than with the MYJ scheme during night time. The YSU scheme showed lower RMSE than the MYJ scheme on sunny, cloudy and rainy day, too. The experiment result of FDDA showed that PBL height error were reduced by FDDA and PBL height at the nudging coefficient of $3.0{\times}10^{-1}$ (YSU_FDDA_2) were similar to observation compared to the nudging coefficient of $3.0{\times}10^{-4}$ (YSU_FDDA_1).

Keywords

Acknowledgement

Grant : 기상업무 지원기술개발연구

Supported by : 국립기상과학원

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