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2017년 1월 20일 발생한 강원 영동대설 사례에 대한 대기의 구조적 특성 연구

A Study on the Synoptic Structural Characteristics of Heavy Snowfall Event in Yeongdong Area that Occurred on 20 January, 2017

한국환경과학회지 2019년 28권 9호 p.765 ~ 784
안보영 ( Ahn Bo-Young ) - 국립기상과학원 관측예보연구과

이정선 ( Lee Jeong-Sun ) - 국립기상과학원 관측예보연구과
김백조 ( Kim Baek-Jo ) - 국립기상과학원 관측예보연구과
김희원 ( Kim Hui-Won ) - 강원지방기상청 관측과

Abstract


The synoptic structural characteristics associated with heavy snowfall (Bukgangneung: 31.3 cm) that occurred in the Yeongdong area on 20 January 2017 was investigated using surface and upper-level weather charts, European Centre for Medium-Range Weather Forecasts (ECMWF) reanalysis data, radiosonde data, and Moderate Resolution Imaging Spectroradiometer (MODIS) cloud product. The cold dome and warm trough of approximately 500 hPa appeared with tropopause folding. As a result, cold and dry air penetrated into the middle and upper levels. At this time, the enhanced cyclonic potential vorticity caused strong baroclinicity, resulting in the sudden development of low pressure at the surface. Under the synoptic structure, localized heavy snowfall occurred in the Yeongdong area within a short time. These results can be confirmed from the vertical analysis of radiosonde data and the characteristics of the MODIS cloud product.

키워드

Yeongdong; Heavy snowfall; Tropopause folding; Radiosonde; Modis
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