Author(s): Joo-Heon Lee, Ho-Won Jang, Seo-Yeon Park, Hyun-Pyo Hong, Tae-Woon Kim
Linked Author(s): Joo-Heon Lee
Keywords: Extreme drought, Chuk Woo Kee, periodicity, trends, magnitude
Abstract: This study aims to provide a historical extreme drought information of Korea using the long-term precipitation for longer than 300 years that were observed by the Korean Meteorological Administration (KMA) during 1908~2015, and paleo-climate data by the Korea's ancient rain gauge (Chuk Woo Kee) during 1777-1907 and future climate change scenario from 2017-2099. Basic statistical analysis was performed such as annual/seasonal average, trends, periodicities, and outliers for the precipitation in order to compare the statistical characteristics of 2 different observed data as well as climate change scenario. The analysis results showed that annual average precipitation and seasonal precipitation were considerably different between records by Chuk Woo Kee and records by the KMA. Precipitation data by Chuk Woo Kee has seriously decreasing trends but KMA observed data show significant increasing trends because of climate change effect. While, Outliers analysis (�1. 5?) using annual precipitation data show very interesting repetition of dry (-1. 5?) and wet (+1. 5?) year period during 230 years which show extreme flood and drought periods. SPI (6) was calculated in order to analyze severity and magnitude of the extreme drought by the drought index. Dry spell using SPI (6) indicated that extreme drought was more frequent during spring season in Chuk Woo Kee data, while KMA data show much frequent extreme drought during autumn. Such trends represented that occurrence of extreme drought was shifted from spring to autumn season. Further, the severest drought event was in the year 1901 in Seoul area with the mean drought severity -1. 9 and for a duration of 12 months. As a multi-year continuous drought event, the 1899~1907 drought period was the severest drought event in Seoul with the mean severity -1. 4, and for a duration of 73 months
Year: 2017