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Episode Analysis of the Habit and Phase Changes of Snow Crystals in the Wintertime Yeongdong Region

겨울철 영동지역 눈 결정 습성과 성상 변화 에피소드 분석

  • Young-Gil Choi (Observation Research Department, National Institute of Meteorological Sciences) ;
  • Byung-Gon Kim (Department of Atmospheric Environmental Sciences, Gangneung-Wonju National University) ;
  • Ji-Yun Kim (Department of Atmospheric Environmental Sciences, Gangneung-Wonju National University) ;
  • Tae-Yeon Kim (Department of Atmospheric Environmental Sciences, Gangneung-Wonju National University) ;
  • Jin-Heon Han (Department of Atmospheric Environmental Sciences, Gangneung-Wonju National University) ;
  • GyuWon Lee (BK21 Weather Extremes Education & Research Team, Department of Atmospheric Sciences, Center for Atmospheric REmote sensing (CARE), Kyungpook National University) ;
  • Kwonil Kim (School of Marine and Atmospheric Sciences, Stony Brook University) ;
  • Ki-Hoon Kim (Observation Research Department, National Institute of Meteorological Sciences) ;
  • Byung-Hwan Lim (High Impact Research Laboratory, National Institute of Meteorological Sciences)
  • 최영길 (국립기상과학원 관측연구부) ;
  • 김병곤 (강릉원주대학교 대기환경과학과) ;
  • 김지윤 (강릉원주대학교 대기환경과학과) ;
  • 김태연 (강릉원주대학교 대기환경과학과) ;
  • 한진헌 (강릉원주대학교 대기환경과학과) ;
  • 이규원 (경북대학교 지구시스템과학부, BK21 위험기상 교육연구팀, 대기원격탐사연구소) ;
  • 김권일 (스토니브룩대학교 해양대기과학부) ;
  • 김기훈 (국립기상과학원 관측연구부) ;
  • 임병환 (국립기상과학원 재해기상연구소)
  • Received : 2024.02.23
  • Accepted : 2024.04.06
  • Published : 2024.05.31

Abstract

The Yeongdong region has suffered from severe snowstorms and the relevant damage such as traffic accidents on slippery roads, and the collapse of greenhouses and temporary buildings. While a lot of research on snowfall has been conducted, the detailed study of snow crystals' phase and habit through intensive observations and the relevant microphysical analysis is still lacking. Therefore, a snowflake camera, PARSIVEL, and intensive radiosonde soundings were utilized to investigate phase and habit changes in solid precipitation. Two remarkable episodes of phase and habit changes were selected such as 19 March 2022 and 15 February 2023. Both events occurred in the synoptic condition of the High in the north and the Low passing by the south, which was accompanied by rapid temperature cooling below 2.5 km. During the events of a short period between 3 to 6 hours, the temperature at 850 hPa decreased by about 4 to 6℃. This cooling led to a change in the main habit of snow particles from riming to aggregate, identified with both MASC and PARSIVEL. Meanwhile, the LDAPS model analyses do not successively represent the rapid cooling and short-term variations of solid precipitation, probably by virtue of overestimating low-level equivalent potential temperature during these periods. The underlying causes of these the low-level temperature variations within 6 hours, still remain unclear. It might be associated with mesoscale orographic phenomenon due to the mountains and East Sea effects, which certainly needs an intensive and comprehensive observation campaign.

Keywords

Acknowledgement

이 연구는 기상청 국립기상과학원 「국가 기상관측장비 및 관측자료 표준화」(KMA2018-00221)의 지원과 예보연구부 학술연구용역 지원으로 수행되었습니다. 또한, 이 성과는 정부의 재원으로 한국연구재단의 지원을 받아 수행된 연구입니다(NRF-2022R1F1A1063196).

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