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The Recent Increase in the Heavy Rainfall Events in August over the Korean Peninsula

Cha, Eun-Jeong   (Typhoon and Asian Dust Team, Korea Meteorological AdministrationCC0187520  ); Kimoto, Masahide   (Center for Climate System Research, University of TokyoUU0015024  ); Lee, Eun-Jeong   (Data Management and Service Team, Korea Meteorological AdministrationCC0187520  ); Jhun, Jong-Ghap   (School of Earth and Environmental Sciences, Seoul National UniversityUU0000691  );
  • 초록

    The characteristics of the rainfall events on the Korean peninsula have been investigated by means of regional and global observational data collected from 1954 to 2004 with an emphasis on extreme cases $80\;mm\;day^{-1}$ . According to our analysis, long-term annual rainfall anomalies show an increasing trend. This trend is pronounced in the month of August, when both the amount of monthly rainfall and the frequency of extreme events increase significantly. Composite maps on August during the 8 wet years reveal warm SST anomalies over the eastern Philippine Sea which are associated with enhanced convection and vertical motion and intensified positive SLP over central Eurasia during August. The rainfall pattern suggests that the most significant increase in moisture supply over the southern parts of China and Korea in August is associated with positive SLP changes over Eurasia and negative SLP changes over the subtropical western Pacific off the east coast of south China. The frequent generation of typhoons over the warm eastern Philippine Sea and their tracks appear to influence the extreme rainfall events in Korea during the month of August. The typhoons in August mainly passed the western coast of Korea, resulting in the frequent occurrence of extreme rainfall events in this region. Furthermore, anomalous cyclonic circulations over the eastern Philippine Sea also promoted the generation of tropical cyclones. The position of pressure systems - positive SLP over Eurasia and negative SLP over the subtropical Pacific - in turn provided a pathway for typhoons. The moisture is then effectively transported further north toward Korea and east toward the southern parts of China during the extreme rainfall period.


  • 주제어

    typhoon .   heavy rainfall .   August.  

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  • 이 논문을 인용한 문헌 (5)

    1. Park, Chang-Yong ; Moon, Ja-Yeon ; Cha, Eun-Jeong ; Yun, Won-Tae ; Choi, Young-Eun 2008. "Recent Changes in Summer Precipitation Characteristics over South Korea" 대한지리학회지 = Journal of the Korean Geographical Society, 43(3): 324~336     
    2. Moon, Ja-Yeon ; Park, Chang-Yong ; Choi, Young-Eun 2011. "Changes in the Characteristics of Summer Rainfall Caused by the Regime Shift in the Republic of Korea" 대한지리학회지 = Journal of the Korean Geographical Society, 46(3): 277~290     
    3. Lee, Dong-In ; Ryu, Chan-Su 2012. "A Comparative Study of Rain Intensities Retrieved from Radar and Satellite Observations: Two Cases of Heavy Rainfall Events by Changma and Bolaven (TY15)" 한국지구과학회지 = Journal of the Korean Earth Science Society, 33(7): 569~582     
    4. Yoon, Phil-Yong ; Kim, Tae-Woong ; Yang, Jeong-Seok ; Lee, Seung-Oh 2012. "Estimating Quantiles of Extreme Rainfall Using a Mixed Gumbel Distribution Model" 韓國水資源學會論文集 = Journal of Korea Water Resources Association, 45(3): 263~274     
    5. Wie, Jieun ; Jang, Swunghwan ; Moon, Byungkwon 2012. "Development of an Experimental Method for Understanding the Effects of the Coriolis Force on the Typhoon Genesis and its Movement" 한국지구과학회지 = Journal of the Korean Earth Science Society, 33(6): 544~553     

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