한반도에서 발생한 끝서리일의 공간분포와 장기변동

Abstract

This study investigated the spatial distribution and long-term variations of the latest frost days (LFD) and analyzed synoptically for the cause of occurrences in Korea. The average LFD in Korea during the period of modern observation (1905~2011) were experienced at the earliest in Masan (March 13) and the latest in Daegwallyeong (May 7). The interannual variations of LFD tend to be earlier (-0.21 days year-1) from 1971 to 2011, the largest change in value was shown in Wonju (-0.69 days year-1). LFD has recorded 138 times in the ancient literature (The Annals of the Joseon Dynasty:1392~1904), and they are most concentrated in May (40%). As a result of comparison with synoptic characteristics of LFD between in the latest 5 years and in the earliest 5 years, LFD in the latest 5years show lower temperature than in the earliest 5 years. It is because the southerly inflow from North Pacific and near the equator was weaker in late years than in early years. LFD in Daegwallyeong (June 2, 2010) is the latest by low temperatures and high humidity during modern observation period. It is because cold air in the upper level inflow in to the Korean peninsula by the blocking high occurred in China and inflow paths of southward wind were moved to the West Sea from the East Sea of Korea, as the anticyclone occurred in the Sea of Okhotsk moved in southerly direction.