기상조건에 따라 고도가 강수 특성에 미치는 영향: 제주도 사례 분석

Abstract

In this study, the influence of altitude (Inf_o_Alt) on precipitation characteristics (amount: Pr_Amt, frequency: Pr_Fre, intensity: Pr_Int) was investigated over various time scales and meteorological conditions (wet/dry year, wind direction/speed) using ground observation data. To investigate the influence of the observation period and number of observation stations on the Inf_o_Alt in Jeju Island, three scenarios were compared: 1) the recent 5-year data (2019~2023, 31 stations), 2) the recent 5-year data (2019~2023, 20 stations), and 3) the 10-year data (2014~2023, 20 stations). Regardless of the number of observation points and analysis period, average annual Pr_Amt and Pr_Int increase linearly with altitude, but Pr_Fre increases up to about 1000 m and decreases thereafter. In general, the Inf_o_Alt on Pr_Amt and Pr_Fre is greater in the rainy season and wet year than in the dry season and dry year. Pr_Amt and Pr_Fre show diurnal variation with a strong peak in the early morning, and the Inf_o_Alt show similar diurnal variation patterns. Pr_Int shows a complex diurnal variation pattern with three peaks, but Inf_o_Alt show an opposite pattern. The Inf_o_Alt on Pr_Int is proportional to intensity, but that on Pr_Fre is inversely proportional. The Inf_o_Alt on precipitation characteristics varies with wind speed, with Pr_Amt being most affected at 10~20 m s1, Pr_Fre at 5~15 m s1, and Pr_Int being linearly proportional to wind speed. In Jeju, the small size of Mt. Halla leads to minimal differences in the Inf_o_Alt on precipitation between the windward and leeward sides.