여름철 한반도 강수의 시·공간적 특성 연구

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 authorslooked through climatological features of the summertime precipitation, then examined thedegree of locality of the precipitation, and probable precipitation amount and its return periodof 100 years (i.e., an extreme precipitation event). The amount of monthly total precipitationshowed increasing trends for all the summer months during the investigated 38-year period. Inparticular, the increasing trends were more significant for the months of July and August. Theincreasing trend of July was seen to be more attributable to the increase of precipitation intensitythan that of frequency, while the increasing trend of August was seen to be played moreimportantly by the increase of the precipitation frequency. The e-folding distance, which is calculatedusing the correlation of the precipitation at the reference station with those at all otherstations, revealed that it is August that has the highest locality of hourly precipitation, indicatinghigher potential of localized heavy rainfall in August compared to other summer months. More localized precipitation was observed over the western parts of the Korean peninsulawhere terrain is relatively smooth. Using the 38-years long series of maximum daily andhourly precipitation as input for FARD2006 (Frequency Analysis of Rainfall Data Program2006), it was revealed that precipitation events with either 360 mm day−1 or 80 mm h−1 canoccur with the return period of 100 years over the Korean Peninsula.