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The Korean Earth Science Society (한국지구과학회)
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A Case Study of Snowfall Event over Yeongdong Region on March 1-2, 2021

2021년 3월 1-2일 영동지역 강설 사례 연구

  • Bo-Yeong Ahn (High Impact Weather Research Laboratory, Forecast Research Department, National Institute of Meteorological Sciences) ;
  • Byunghwan Lim (High Impact Weather Research Laboratory, Forecast Research Department, National Institute of Meteorological Sciences)
  • 안보영 (국립기상과학원 예보연구부 재해기상연구소) ;
  • 임병환 (국립기상과학원 예보연구부 재해기상연구소)
  • Received : 2023.04.03
  • Accepted : 2023.04.28
  • Published : 2023.04.30
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Abstract

The synoptic, thermodynamic, and dynamic characteristics of a snowfall event that occurred in the Yeongdong region on March 1-2, 2021, were investigated. Surface weather charts, ERA5 reanalysis data, rawinsonde data, GK-2A satellite data, and WISSDOM data were used for analysis. The snow depth, exceeding 10 cm, was observed at four weather stations during the analysis period. The maximum snow depth (37.4 cm) occurred at Bukgangneung. According to the analysis of the weather charts, old and dry air was trapped within relatively warm, humid air in the upper atmosphere over the East Sea and adjacent Yeongdong region. This caused unstable atmospheric conditions that led to developing convective clouds and snowfall over Bukgangneung. In particular, based on the thermodynamic and kinematic vertical analysis, we suggest that strong winds attributable to the vertical gradient of potential temperature in the low layer and the development of convective instability due to cold advection played a significant role in the occurrence of snowfall in the Yeongdong region. These results were confirmed from the vertical analysis of the rawinsonde data.

본 연구는 2021년 3월 1일부터 2일까지 영동지역에 강설이 발생했던 사례의 종관적, 열역학적, 역학적 특성을 분석한 것이다. 분석에 사용한 자료는 AWS 관측자료, 지상일기도, ERA5 재분석 자료, 레윈존데, 천리안 2A 위성 자료, WISSDOM 자료 등이다. 사례 기간 영동지역 4개소에서 관측된 적설은 10 cm 이상으로 나타났으며, 북강릉(37.4 cm)에서는 가장 많은 적설을 보였다. 종관 분석결과, 동해상 및 영동지역 주변으로 중·상층 대기의 매우 차고 건조한 대기와 상대적으로 따뜻한 하층 대기의 온도 차이로 대류 불안정이 형성되어 북강릉 지역으로 대류운의 발달과 함께 강설이 나타났다. 특히 열역학적 및 운동학적 연직 분석에서, 하층에서 온위의 연직 경도에 의한 강한 바람과 한랭이류에 의한 대류 불안정이 영동지역의 강설 발생에 큰 역할을 한 것으로 판단된다. 이러한 결과는 레윈존데의 연직 분석에서도 확인할 수 있었다.

Keywords

Acknowledgement

본 연구는 기상청 국립기상과학원 "재해기상 목표 관측·분석·활용기술 개발 (KMA2018-00123)" 과제의 일환으로 수행되었습니다.

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