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Korean Meteorological Society (한국기상학회)
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Synoptic and Meso Scale Mechanisms of Reported Tornado-like Gust Wind Event in Korea Using High-resolution Numerical Simulation

고해상도 수치모델을 이용한 한반도 토네이도성 돌풍 사례에 대한 종관 및 중규모 발생 메커니즘 연구

  • Ka-young Byen (School of Earth and Environmental Sciences, Seoul National University) ;
  • Jung-Hoon Kim (School of Earth and Environmental Sciences, Seoul National University) ;
  • Yi-June Park (School of Earth and Environmental Sciences, Seoul National University)
  • 변가영 (서울대학교 지구환경과학부) ;
  • 김정훈 (서울대학교 지구환경과학부) ;
  • 박이준 (서울대학교 지구환경과학부)
  • Received : 2024.07.05
  • Accepted : 2024.09.19
  • Published : 2024.11.30
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Abstract

Reported tornado event occurred in Dangjin, Chungcheongnam-do at 0650~0730 UTC on 15 March 2019 was examined using Weather Research and Forecasting model with four nested domains (dx = 5, 1, 0.2, and 0.05 km). From synoptic analysis in ERA5 reanalysis data, eastward moving upper-level trough was developed rapidly in the Yellow Sea. Strong tropopause folding with Potential Vorticity Unit (PVU) higher than 1.5 PVU moved downward to 600-hPa level in mid troposphere following the trough over the location of tornado event. Under this large-scale background condition, surface front developed very intensively in the west coast of Korea along with strong low-level jet and moisture band at 850-hPa level. In domain 2, the maximum Bulk wind shear at Dorido point was 12.86 m s-1. Cold front evolved to be a comma cloud with upper-level trough and strong bulk vertical shear near Dangjin, which include eastward moving gust front revealed as a strong horizontal temperature gradient and convergence near the surface. In domains 3 and 4, the local maximum value of the simulated vertical vorticity (24 × 10-2 s-1) with strong updraft (8.18 m s-1) near the observed tornado event along with the surface gust front was found to be a possible area for tornadogenesis from the x-z and time-z cross-sections near the simulated tornado event. In the vorticity budget analysis, the local maximum of vertical vorticity during this event was generated significantly by tilting and stretching forcings.

Keywords

Acknowledgement

논문의 질을 향상시키는데 많은 도움을 주신 두 익명의 심사위원 분들께 진심으로 감사드립니다. 또한, 논문의 작성을 위해 많은 도움을 주신 서울대학교 지구환경과학부 백종진 교수님, 손석우 교수님께 감사를 드립니다. 그리고, 서울대 예보분석응용실험실 동료분들과 기상청 총괄예보관의 허진호 수석 전문관님 이하 동료분들께도 감사의 인사를 드립니다. 이 연구에 참여한 김정훈 교수와 박이준 연구원의 연구 재원은 기상청 국립기상과학원 「위험기상 분석 및 예보기술 고도화」(KMA2018-00121)와 기상청 「위험기상선제대응 기술개발사업」(RS-2023-00233640)의 지원으로 수행되었습니다.

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