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Korean Meteorological Society (한국기상학회)
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Three-dimensional Analysis of Heavy Rainfall Using KLAPS Re-analysis Data

KLAPS 재분석 자료를 활용한 집중호우의 3차원 분석

  • Jang, Min (WISE Projects, Hankuk University of Foreign Studies) ;
  • You, Cheol-Hwan (Atmospheric Environmental Research Institute, Pukyong National University) ;
  • Jee, Joon-Bum (WISE Projects, Hankuk University of Foreign Studies) ;
  • Park, Sung-Hwa (WISE Projects, Hankuk University of Foreign Studies) ;
  • Kim, Sang-il (WISE Projects, Hankuk University of Foreign Studies) ;
  • Choi, Young-Jean (WISE Projects, Hankuk University of Foreign Studies)
  • 장민 (한국외국어대학교 차세대도시농림융합기상사업단) ;
  • 유철환 (부경대학교 대기환경연구소) ;
  • 지준범 (한국외국어대학교 차세대도시농림융합기상사업단) ;
  • 박성화 (한국외국어대학교 차세대도시농림융합기상사업단) ;
  • 김상일 (한국외국어대학교 차세대도시농림융합기상사업단) ;
  • 최영진 (한국외국어대학교 차세대도시농림융합기상사업단)
  • Received : 2015.12.10
  • Accepted : 2016.02.18
  • Published : 2016.03.31
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Abstract

Heavy rainfall (over $80mm\;hr^{-1}$) system associated with unstable atmospheric conditions occurred over the Seoul metropolitan area on 27 July 2011. To investigate the heavy rainfall system, we used three-dimensional data from Korea Local Analysis and Prediction System (KLAPS) reanalysis data and analysed the structure of the precipitation system, kinematic characteristics, thermodynamic properties, and Meteorological condition. The existence of Upper-Level Jet (ULJ) and Low-Level Jet (LLJ) are accelerated the heavy rainfall. Convective cloud developed when a strong southwesterly LLJ and strong moisture convergence occurring around the time of the heavy rainfall is consistent with the results of previous studies on such continuous production. Environmental conditions included high equivalent potential temperature of over 355 K at low levels, and low equivalent potential temperature of under 330 K at middle levels, causing vertical instability. The tip of the band shaped precipitation system was made up of line-shaped convective systems (LSCSs) that caused flooding and landslides, and the LSCSs were continuously enhanced by merging between new cells and the pre-existing cell. Difference of wind direction between low and middle levels has also been considered an important factor favouring the occurrence of precipitation systems similar to LSCSs. Development of LSCs from the wind direction difference at heights of the severe precipitation occurrence area was also identified. This study can contribute to the identification of production and development mechanisms of heavy rainfall and can be used in applied research for prediction of severe weather.

Keywords

References

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