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Spatio-Temporal Patterns of Intra-annual Extreme Precipitation Events in the Republic of Korea

  • Journal of the Association of Korean Geographers
  • Abbr : JAKG
  • 2013, 2(2), pp.137-145
  • Publisher : Association of Korean Geographers
  • Research Area : Social Science > Geography

Gwangyong Choi 1 Lee, Seungwook 1

1제주대학교

ABSTRACT

The purpose of this study is to examine the spatial patterns of monthly extreme precipitation events across the Republic of Korea based on daily precipitation data for the period of 2002~2011 observed at automatic weather systems (AWS) and Automated Synoptic Observation Systems (ASOS) under the supervision of the Korea Meteorological Administration. According to time series analyses, the number of stations with extreme precipitation events exceeding 80㎜ of daily total precipitation increases with the onset of summer Changma, forms its major peaks in mid-July and noticeably decreases with the offset of climatological summer in mid-September. Spatially, relatively high frequency of extreme precipitation events is observed in Jeju Island and southern coastal regions of the Korea Peninsula between late spring and early summer associated with migratory low pressure systems, while such patterns appear everywhere with the onset of summer Changma including central regions. In particular, noticeable high frequency of extreme precipitation events is observed in Mt. Halla, southern coastal mountain regions, southern flank of Mt. Jiri along the Sobaek mountain ridges, northern mountain regions in Gyeoggi province and along the Taebaek mountain ridge. In contrast, relatively high ratio of cumulative extreme precitation to total precipitation appears in interior regions where annual total precipitation is relatively small. These results indicate that the interactions between topography and moisture advection by migratory lows, Changma front and typhoons are crucial to the spatio-temporal patterns of extreme precipitation events in the Republic of Korea.

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