지리산 활강풍(Katabatic Wind)에 의한 사천지방 겨울철 일최저기온의 변화

Abstract

There is remarkably daily minimum temperature in winter at the southwest inland, Kyongnam in comparison with other regions of the same latitude. It is estimated that this data is influenced by topographical effect and Katabatic wind in Jiri-mountain. This study analyzes the reason of the daily minimum temperature in winter compared with other regions centering around Sacheon region through the analysis of the wind field and topography of Jiri-mountain. The data is the daily minimum temperature and wind during the past ten years, and the every hour data for the period from 21 of the other day to 6 of the day centering around the day of minimum temperature. The data use DB which is constructed by Combined Meteorological Information System(COMIS). Analysis of topography and wind (wind rose and serial analysis) around Jiri-mountain is carried out.

Result : The study shows the existence of Katabatic wind and the change of the daily minimum temperature in connection with Katabatic wind through the analysis of the wind rose and serial analysis around Jiri-mountain. Especially, this study demonstrates that the minimum temperature of Sacheon, Jinju region in winter, early spring and late fall is lower than that of Hadong, Masan, Busan, Suncheon, Gwangyang at the same latitude by the Katabatic wind Jiri-mountain. Katabatic wind is generated at a mountainous area which has larger inclination at leeward side than upward side and height of the Mt. is at least 1km as well. The study shows the change of the temperature by Katabatic wind centering around Jiri-mountain. This result suggests that Katabatic wind influences other regions as well as Jiri-mountain. Thus, the mountain effect should be considered as the fact of the forecast of the daily minimum temperature.