한국지구과학회지 제41권 제3호 (p.222-237)

2018년 8월 6일 발생한 영동지역 집중호우 사례에 대한 특성 연구

Characteristics of a Heavy Rainfall Event in Yeongdong Region on 6 August, 2018
키워드 :
heavy rainfall,wind shear,inversion layer,atmospheric instability,COMS

목차

Abstract
요 약
1. 서 론
2. 자료 및 분석방법
   2.1. 종관 및 관측 자료
   2.2. 위성 자료
   2.3. ECMWF 재분석 자료
3. 결 과
   3.1. 기온 및 강수발생 특성
   3.2. 종관기상 특성
   3.3. 강수 구름 특성
   3.5. 대기의 연직구조 특성
   3.6. 대기의 운동학적 특성
4. 요약 및 결론
References

초록

A heavy (93 mm hr−1) rainfall event accompanied by lightning occurred over Gangneung in the Yeongdong region of South Korea on August 6, 2018. This study investigated the underlying mechanism for the heavy rainfall event by using COMS satellite cloud products, surface- and upper-level weather charts, ECMWF reanalysis data, and radiosonde data. The COMS satellite cloud products showed rainfall exceeding 10 mm hr−1, with the lowest cloud-top temperature of approximately −65oC and high cloud optical thickness of approximately 20-25. The radiosonde data showed the existence of strong vertical wind shear between the upper and lower cloud layers. Furthermore, a strong inversion in the equivalent potential temperature was observed at a pressure altitude of 700 hPa. In addition, there was a highly developed cloud layer at a height of 13 km, corresponding with the vertical analysis of the ECMWF data. This demonstrated the increased atmospheric instability induced by the vertical differences in equivalent potential temperature in the Yeongdong region. Consequently, cold, 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 rapidly developing convective clouds and heavy rainfall over Gangneung.