영동 지역의 극한 대설 사례와 관련된 종관 환경
Synoptic Environment Associated with Extreme Heavy Snowfall Events in the Yeongdong Region
2
조회
0
다운로드
8
인용
0
참고문헌
키워드
초록
This study presents local and synoptic conditions associated with extreme heavysnowfall events in the Yeongdong region, as well as the temporal and spatial variability ofthese conditions. During the last 12 years (2001~2012), 3 extreme snowfall events occurred inthe Yeongdong region, which recorded daily snowfall greater than 50 cm, respectively. In theseevents, one of the noticeable features is the occurrence of heavy hourly snowfall greater than10 cm. It was reported from satellite analysis that these heavy snowfall may be closely relatedto mesoscale convective clouds. In this paper the 3 extreme events are examined on their synopticenvironments associated with the developments of mesoscale convective system usingnumerical model output. These 3 events all occurred in strongly forced synoptic environmentswhere 500 and 300 hPa troughs and 500 hPa thermal troughs were evident. From the analysisof diagnostic variables, it was found in all 3 events that absolute vorticity and cold air advectionwere dominant in the Yeongdong region and its surrounding sea at upper levels, especiallyat around 500 hPa (absolute vorticity: 20~60 × 10−5 s−1, cold air advection: −10~−20 oC12 hr−1). Moreover, the spatial distributions of cold advection showed mostly the shape of anarrow band along the eastern coast of Korea. These features of absolute vorticity and coldadvection at 500 hPa were sustained for about 10 hours before the occurrence of maximumhourly snowfall.
Abstract
This study presents local and synoptic conditions associated with extreme heavysnowfall events in the Yeongdong region, as well as the temporal and spatial variability ofthese conditions. During the last 12 years (2001~2012), 3 extreme snowfall events occurred inthe Yeongdong region, which recorded daily snowfall greater than 50 cm, respectively. In theseevents, one of the noticeable features is the occurrence of heavy hourly snowfall greater than10 cm. It was reported from satellite analysis that these heavy snowfall may be closely relatedto mesoscale convective clouds. In this paper the 3 extreme events are examined on their synopticenvironments associated with the developments of mesoscale convective system usingnumerical model output. These 3 events all occurred in strongly forced synoptic environmentswhere 500 and 300 hPa troughs and 500 hPa thermal troughs were evident. From the analysisof diagnostic variables, it was found in all 3 events that absolute vorticity and cold air advectionwere dominant in the Yeongdong region and its surrounding sea at upper levels, especiallyat around 500 hPa (absolute vorticity: 20~60 × 10−5 s−1, cold air advection: −10~−20 oC12 hr−1). Moreover, the spatial distributions of cold advection showed mostly the shape of anarrow band along the eastern coast of Korea. These features of absolute vorticity and coldadvection at 500 hPa were sustained for about 10 hours before the occurrence of maximumhourly snowfall.
참고문헌 (16)
- Ahn, J. -B., "The limited area energy budget associated with an extratropical cyclone developed over the Japan Sea", J. Korean Meteor. Soc., 20, pp.22~34 (1984)
- Asai, T., "Meso-scale features of heavy snowfalls in Japan Sea coastal regions of Japan", Tenki, 35, pp.156~161 (1988)
- 조구희, "영동지역 겨울철 강수와 연관된 산악효과와 해양효과", 대기, 22(1), pp.57~71 (2012), 한국기상학회
- 조영준, "영동지역의 극한 대설에 대한 위성관측으로부터 구름 추적", 대한원격탐사학회지, 30(1), pp.83~107 (2014), 대한원격탐사학회[DOI]
- 정광범, "영동지역 겨울철 강수와 관련된 하층 바람의 특성", 한국기상학회지, 40(4), pp.369~380 (2004), 한국기상학회
- Doswell, C. A., III, "Flash flood forecasting: An ingredients-based methodology", Wea. Forecasting, 11, pp.560~581 (1996)
- 허기영, "2005년 3월 5일에 나타난 부산지역 대설의 발달기구에 대한 연구", 한국기상학회지, 41(4), pp.547~556 (2005), 한국기상학회
- 김지언, "영동대설 사례와 관련된 동해상의 현열속과 잠열속 분포 특성", Ocean and Polar Research, 27(3), pp.237~250 (2005), 한국해양과학기술원
- 이홍란, "급격히 발달하는 저기압과 관련된 대류권계면 파상운동", 한국기상학회지, 38(5), pp.431~463 (2002), 한국기상학회
- Lee, J. -G., "Development of the techniques for analyzing of severe weather meteorological variables in the Gangwon region I", Nat. Inst. Meteor. Res., pp.802~ (2011)
- 이진화, "영동지역 대설 사례의 대기 하층 안정도 분석", 대기, 22(2), pp.209~219 (2012), 한국기상학회[DOI]
- Lee, T. -Y., "A numerical modeling study of mesoscale cyclogenesis to the East of the Korean peninsula", Mon. Wea. Rev., 126, pp.2305~2329 (1998)
- Lim, B. -H., "The Development of Forecaster’s Analysis System(FAS)", J. Korean Meteor. Soc., 12, pp.586~588 (2002)
- Maddox, R. A., "Mesoscale Convective Complexes", Bull. Amer. Meteor. Soc., 61, pp.1374~1387 (1980)
- Nagata, M., "Meso-β-scale vortices developing along the Japan-Sea Polar-Airmass Convergence Zone (JPCZ) cloud band: Numerical simulation", J. Meteor. Soc. Japan, 71, pp.43~57 (1993)
- 남형구, "Characteristics of Easterly-Induced Snowfall in Yeongdong and Its Relationship to Air-Sea Temperature Difference", 한국기상학회지, 50(4), pp.541~552 (2014), 한국기상학회