한국의 여름과 겨울 기온극점의 시공간분포

Abstract

This study investigated the spatial distributions and long-term trends of the annual highest and lowest temperature points (summer peak temperature, SPT; and winter peak temperature, WPT) and their timings (summer peak day, SPD; and winter peak day, WPD) in Korea. The two peaks were determined by selecting the highest and lowest points after removing temperature variations under a seasonal scale (90 days) in the time series of daily mean temperatures. For the long-term trend, all the available temperature data of each station were used. We examined data for 100 years (1909-2008) for five stations; data for 56 years (1953-2008) for nine stations; and data for 35 years (1974-2008) for 61 stations. The SPD in Korea is August 4 on average. It is the earliest (July 31) in the central inland region (Chuncheon, Hongcheon, and Wonju), the central hilly sections (Daegwallyeong), and the southern inland region (Gumi), and the latest (August 10) in the southern coastal region (Busan, Tongyeong, and, Yeosu) and Jeju island (Seogwipo). In Korea, the WPD is January 16 on average. It is the earliest (January 13) in the central inland region (Echeon), and the latest (January 24) in Jeju island (Jeju) and Ulleungdo. SPT and WPT are the highest in Jeju island (Seogwipo) (27.3℃ and 6.4℃, respectively) and the lowest in the central hilly sections (Daegwallyeong) (20.2℃ and -7.9℃, respectively). The interannual variations of WPD and WPT were greater than those of SPD and SPT. SPD did not exhibit clear change in all the analysis periods and stations except for Wando for 35 years. WPD arrived earlier at seven stations for 35 years and at three stations for 56 years. WPT exhibited warming trend at 56 stations for 35 years and at all stations for 56 years and 100 years. SPT did not exhibit warming trend in all the analysis periods and stations except for Seogwipo for 35 years. There were even stations (Chupungnyeong, Mungyeong) that exhibited a falling trend.