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Korean Meteorological Society (한국기상학회)
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Decadal Change in Rainfall During the Changma Period in Early-2000s

2000년대 초반 우리나라 장마기간 강수량의 십년 변화 특성

  • Woo, Sung-Ho (Climate Prediction Team, APEC Climate Center) ;
  • Yim, So-Young (Climate Prediction Division, Korea Meteorological Administration) ;
  • Kwon, Min-Ho (Ocean Circulation and Climate Center, Korea Institute of Ocean Science and Technology) ;
  • Kim, Dong-Joon (Climate Prediction Division, Korea Meteorological Administration)
  • Received : 2017.06.07
  • Accepted : 2017.08.14
  • Published : 2017.09.30
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Abstract

The decadal change in rainfall for Changma period over the South Korea in early-2000s is detected in this study. The Changma rainfall in P1 (1992~2002) decade is remarkably less than in P2 (2003~2013) decade. The much rainfall in P2 decade is associated with the increase of rainy day frequency during Changma period, including the frequent occurrences of rainy day with a intensity of 30 mm/day or more in P2 decade. This decadal change in the Changma rainfall is due to the decadal change of atmospheric circulation around the Korean Peninsula which affects the intensity and location of Changma rainfall. During P2 decade, the anomalous anti-cyclone over the south of the Korean Peninsula, which represents the expansion of the North Pacific high with warm and wet air mass toward East Asia, is stronger than in P1 decade. In addition, the upper level zonal wind and meridional gradient of low-level equivalent potential temperature in P2 decade is relatively strengthened over the northern part of the Korean Peninsula than in P1 decade, which corresponds with the intensification of meridional gradient between air mass related to the East Asian summer monsoon nearby the Korean Peninsula in P2 decade. The enhanced meridional gradient of atir mass during P2 decade is favorable condition for the intensification of Changma rainfall band and more Changma rainfall. The atmospheric conditions related to enhanced Changma rainfall during P2 decade is likely to be influenced by the teleconnection linked to the suppressed convection anomaly over the southern part of China and South China Sea in P2 decade.

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References

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