全北地域의 極限氣候事象 降水部分으로 본 氣候變化 特性

Abstract

Due to the climate changes, abnormal weather conditions, including the severe tropical cyclone, heavy rainfall, heavy snow, cold wave, heat wave and tornado, are frequently occurring around the world. These abnormal weather conditions are very likely to become more frequent due to the global warming. The Jeonbuk area is also being damaged by the extraordinary weather events. In this study, the climate change characteristics of Jeonbuk area was analyzed by examining the events related to the precipitation, among the climate extreme events specified by WMO. The survey data for the past 38 years (1973 ? 2010) were used for the study. The survey areas included Gunsan, Jeonju, Buan, Imsil, Jeongeup and Namwon. The monthly and yearly data were determined by averaging and summing up the daily data. To minimize the errors from the ideal climate phenomenon, five-year moving average values were used. In addition, ten-year average values were used to identify the difference by year. The climate extreme events that are related to the precipitation are heavy precipitation days (r10), consecutive dry days (CDD), highest five-day precipitation amount (R5D), simple daily intensity index (SDII), precipitation fraction due to very wet days (R95T), etc. The r10 value increased at a rate of 0.061 day/year, and the most in Gunsan. The CDD decreased at a rate of -0.023 day/year, and the most in Jeongeup. The R5D increased at a rate of 1.691 mm/year, and the most in Imsil. The SDII increased at a rate of 0.027 mm/day/year, and the most in Gunsan and Imsil. The R95T increased at a rate of 0.199%/year, and the most in Jeonju. The results of the analysis of the climate extreme events showed that the amount of precipitation gradually increased for a specific period, as in the R5D. The increase in the number of days with precipitation above a certain level, such as the r10, seems to have been because the increase in the mean temperature of the Jeonbuk area made the heat convection strong. It seems that the mean, maximum and minimum temperatures that change according to the climate changes in the Jeonbuk area led to convective instability around the area, and the increase in the saturation water vapor pressure influenced the consecutive precipitation days and precipitation intensity to bring changes to the precipitation of the Jeonbuk area. In addition, increasing heavy rain and precipitation indicated that the climate of the Jeonbuk area was changing into the subtropical climate from the temperate climate. The climate change is a worldwide trend, and the estimation of the future changes in the Jeonbuk area will be required to locally take action to the climate changes. With the changing type and amount of precipitation, new irrigation facilities are also required. In addition, the climate change effects on the vegetation and living environment must be examined.