Study on Temporal and Spatial Characteristics of Summertime Precipitation over Korean Peninsula

Abstract

This study investigated the temporal and spatial characteristics of summertime (June-August) precipitation over Korean peninsula, using Korea Meteorological Administration (KMA)ís Automated Synoptic Observing System (ASOS) data for the period of 1973-2010 and Automatic Weather System (AWS) data for the period of 1998-2010.The authors looked through climatological features of the summertime precipitation, then examined the degree of locality of the precipitation, and probable precipitation amount and its return period of 100 years (i.e., an extreme precipitation event). The amount of monthly total precipitation showed increasing trends for all the summer months during the investigated 38-year period. In particular, the increasing trends were more significant for the months of July and August. The increasing trend of July was seen to be more attributable to the increase of precipitation intensity than that of frequency, while the increasing trend of August was seen to be played more importantly by the increase of the precipitation frequency. The e-folding distance, which is calculated using the correlation of the precipitation at the reference station with those at all other stations, revealed that it is August that has the highest locality of hourly precipitation, indicating higher potential of localized heavy rainfall in August compared to other summer months. More localized precipitation was observed over the western parts of the Korean peninsula where terrain is relatively smooth. Using the 38-years long series of maximum daily and hourly precipitation as input for FARD2006 (Frequency Analysis of Rainfall Data Program 2006), it was revealed that precipitation events with either 360 mm day −1 or 80 mm h −1 can occur with the return period of 100 years over the Korean Peninsula.

Geostatistical assessment of summertime rainfall observations in Korea based on composite precipitation and satellite water vapor data

“…In Korea, the spatial and temporal characteristics of precipitation have been reported in several previous studies (e.g., Chang and Kwon, 2005;Hong et al, 2006;Ha et al, 2007;In et al, 2014). Ha et al (2007) found that the e-folding ::::::: -folding distance and time in correlation coefficients of AWS precipitation ranged from 50 to 110 km and 1 to 2 h, respectively.…”

“…precipitation : observations in Korea based on :::: the : composite precipitation and satellite water vapor data 1 Introduction Heavy rainfall causes one of the most serious meteorological disasters in Korea. Most precipitation systems in Korea are highly influenced by the East Asian summer monsoon, called Changma in Korean (Riyu et al, 2001;Kim et al, 2002;Lee et al, 2017b), and hence have high seasonal variation: ; : they also show high spatial variation due to complex topographic features (e.g., Ko et al, 2005;Chang and Kwon, 2007;Park and Lee, 2007;In et al, 2014). Since heavy rainfalls including typhoon cause serious damages to both human life and property, improving the their forecast accuracy is of utmost importance.…”

“…Ha et al (2007) found that the e-folding ::::::: -folding distance and time in correlation coefficients of AWS precipitation ranged from 50 to 110 km and 1 to 2 h, respectively. In summer, precipitation showed localized features with relatively more precipitation mainly in the western part and southern coastal areas of Korea (Kim et al, 2005;Hong et al, 2006;In et al 2014). In et al (2014) also analyzed the degree of localization in summer precipitation, and noted a high locality of rainfalls, i.e., more frequent occurrence of short-lived local precipitation, in July and August.…”

“…In summer, precipitation showed localized features with relatively more precipitation mainly in the western part and southern coastal areas of Korea (Kim et al, 2005;Hong et al, 2006;In et al 2014). In et al (2014) also analyzed the degree of localization in summer precipitation, and noted a high locality of rainfalls, i.e., more frequent occurrence of short-lived local precipitation, in July and August. In addition to these studies, we provide further analyses on variation of spatial correlation associated with distribution and intensity of precipitation.…”

Reconstruction of July 2006 Heavy Rainfall Event Series in the Chungju Dam Watershed using a Regional Climate Model

“…1993 년~2010년 동안 호우로 인한 피해 규모는 전체 기상재해(약 22조 1,176억 원)의 약 31% (6조 8,460억 원)을 차지하고 있으며, 태풍(10조 8,745억 원) 다음으로 큰 피해를 입히는 것으로 알려져 있다. 따라서 한반도의 여름철 강수 특성을 잘 이해하는 것은 재해저감 차원에서도 매우 중요한 일이다 (In et al, 2014 (Lee, Jo, et al, 2017…”