최근 5년간 강원 영동지역의 대설과 관련된 기상요소의 변화 특성

Abstract

In this study, based on 10 cases of heavy snowfall observed in the Youngdong area during the past five years (2014‐2018), the characteristics of surface and upper‐air meteorological element change were examined. Automated Surface Observing System (ASOS) data from Bukgangneung (BGN), radiosonde data from Gangneung, buoy data from the East Sea, and ERA‐5 reanalysis data over East Asia were used. Heavy snowfall occurs when sea level pressure increases and air temperature at the surface decreases. Analysis of upper‐air sounding data showed that the more snowfall occurs, the higher the altitude of northwesterly wind. The air‐sea temperature difference in East Sea associated with heavy snowfall was relatively high compared to previous studies. Heavy snowfall was observed at a Precipitable Water Vapor (PWV) of more than 5 mm and a Storm Relative Helicity (SRH, 0~3 km) of 16 to 183 ㎡sSUP‐2/SUP. However, SRH in most cases was lower than the threshold value (150 ㎡sSUP‐2/SUP) for producing precipitation. Also, during heavy snow warnings, snowfall occurred heavily in a relatively short period of time compared with conditions during heavy snow advisories.