대기 (Atmosphere)

  • 제34권4호
  • /
  • Pages.429-444
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  • 2024
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  • 1598-3560(pISSN)
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  • 2288-3266(eISSN)
한국기상학회 (Korean Meteorological Society)
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레윈존데 자료를 이용한 남한의 우기 불안정지수와 환경변수의 특성과 변화 경향 분석

Climatological Characteristics and Trends of Instability Indices and Environmental Parameters for Rainy Season over South Korea Using Rawinsonde Data

  • 김민수 (국립공주대학교 대기과학과) ;
  • 서명석 (국립공주대학교 대기과학과)
  • Min-Su Kim (Department of Atmospheric Science, Kongju National University) ;
  • Myoung-Seok Suh (Department of Atmospheric Science, Kongju National University)
  • 투고 : 2024.08.16
  • 심사 : 2024.10.06
  • 발행 : 2024.11.30
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초록

The frequency and intensity of extreme weather events are increasing due to climate change, causing significant social and economic damage. Consequently, understanding the climatological atmospheric environment and trends in Korea is becoming important. This study analyzes diurnal and intra-seasonal variations of instability indices and environmental parameters (Inst_Inds) using rainy season (May to September) upper-air data from seven stations in Korea. We also analyzed trends in the mean of the Inst_Inds and the counts over the moderately unstable threshold (MUT). CAPE, LI, and TPW exhibit diurnal variation more unstable at 1200 UTC, while KI, SWEAT, and SSI show the most stable at 0600 UTC. Most Inst_Inds show stronger instability in July and August compared to May, June and September, indicating significant intra-seasonal variations. SWEAT and TPW generally show destabilizing trends regardless of station and month, whereas other indices do not exhibit consistent trends. CAPE and LI show destabilizing trends at Baengnyeongdo and Bukgangneung, but stabilizing trends at Osan, Gwangju, and National Typhoon Center. These trends are particularly strong in July and August, and at Baengnyeongdo and Bukgangneung stations, indicating increased instability in northern Korea. The tendency of MUT excess frequency varies from station to station in most instability indices, but TPW shows an increasing trend regardless of the station. The inconsistent trend of counts over MUT in Inst_Inds with the recent increase in frequency and intensity of heavy rain in Korea suggests the need to adjust thresholds that currently do not reflect changes in extreme precipitation characteristics.

키워드

과제정보

본 논문의 개선을 위해 좋은 의견을 제시해 주신 심사위원분들께 감사를 드립니다. 이 연구는 기상청<「위험기상 선제대응 기술개발사업」> (RS-2023-00239653)과 2024년 국립공주대학교 학술연구지원사업의 지원을 받아 수행되었습니다.

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