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Korean Meteorological Society (한국기상학회)
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Characteristics of Long-term (2000~2020) Downslope Windstorm in the Yeongdong Region

영동지역 장기간(2000~2020년) 활강 강풍 특성

  • Ji-Hoon Jeong (Department of Atmospheric Environmental Sciences, Gangneung - Wonju National University) ;
  • Byung-Gon, Kim (Department of Atmospheric Environmental Sciences, Gangneung - Wonju National University) ;
  • Yu-jin Chae (Department of Atmospheric Environmental Sciences, Gangneung - Wonju National University) ;
  • Young-Gil Choi (Department of Atmospheric Environmental Sciences, Gangneung - Wonju National University) ;
  • Ji-Yoon Kim (Department of Atmospheric Environmental Sciences, Gangneung - Wonju National University) ;
  • Byung-Hwan Lim (High Impact Weather Research Laboratory, Forecast Research Department, National Institute of Meteorological Sciences)
  • 정지훈 (강릉원주대학교 대기환경과학과) ;
  • 김병곤 (강릉원주대학교 대기환경과학과) ;
  • 채유진 (강릉원주대학교 대기환경과학과) ;
  • 최영길 (강릉원주대학교 대기환경과학과) ;
  • 김지윤 (강릉원주대학교 대기환경과학과) ;
  • 임병환 (국립기상과학원 예보연구부 재해기상연구소)
  • Received : 2022.10.11
  • Accepted : 2022.12.27
  • Published : 2023.02.28
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Abstract

Characteristics of downslope windstorm (DW) has been examined mainly based on 1-min average wind and the other meteorological conditions in the Yeongdong region for 2000~2020. First, a classification procedure for the downslope windstorm is proposed using surface wind speed (greater than 99 percentile), 1-hour longevity of strong wind (SW), westerly wind direction, low humidity (less than 20 percentile), and leeside warming. The number of DW days satisfying the proposed criteria is 221 (2.9% of total days and 47.5% of SW days) while the number of SW days is 465 (6.1% of total days) for 2000~2020. The occurrences of both SW and DW shows distinctive annual variation with its peak in April. In addition, mean wind speed of DW days is 8.2 m s-1 with its duration of 2 hr 30 min and relative humidity of 28% at Gangneung. An episode (7 May 2021) was selected by applying the proposed criteria to SW days of 2021. The sounding shows that the layer of wind speed greater than 25 m s-1 was lowered down to 925 hPa at Gangneung (leeside) relative to 850 hPa at Hoengseong (Wonju), in the afternoon along with significant warming and drying. Froude numbers of Wonju and Gangneung for the DW events were increased 4 and 5 times greater than those of normal days, respectively. This kind of DW long-term statistics in the leeside of the mountains is thought to build a foundation of further understanding DW mechanism.

Keywords

Acknowledgement

이 연구는 국립기상과학원의 연구개발사업인 "강원영동 동풍·강풍의 특화된 관측·예보기술 개발" 사업의 지원과 한국 연구재단의 부분적인 지원을 받아 수행된 연구입니다(No. NRF-2022R1F1A1063196).

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