Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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Features of Korean Rainfall Variability by Western Pacific Teleconnection Pattern

서태평양 원격패턴에 따른 한국 4월 강수량의 변동 특성

  • Choi, Jae-Won (Policy Research Department, National Institute of Meteorological Research) ;
  • Park, Ki-Jun (Policy Research Department, National Institute of Meteorological Research) ;
  • Lee, Kyungmi (Policy Research Department, National Institute of Meteorological Research) ;
  • Kim, Jeoung-Yun (Policy Research Department, National Institute of Meteorological Research) ;
  • Kim, Baek-Jo (Policy Research Department, National Institute of Meteorological Research)
  • 최재원 (국립기상연구소 정책연구과) ;
  • 박기준 (국립기상연구소 정책연구과) ;
  • 이경미 (국립기상연구소 정책연구과) ;
  • 김정윤 (국립기상연구소 정책연구과) ;
  • 김백조 (국립기상연구소 정책연구과)
  • Received : 2015.01.26
  • Accepted : 2015.03.20
  • Published : 2015.07.31
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Abstract

This study analyzes the correlation between Western Pacific (WP) teleconnection pattern index (WPI) in April during 1954-2008 and rainfall amounts in the same month. Based on the results, it is identified that there have been strong positive correlations between central China, Korea and the southwestern part of Japan in the East Asian region. Through differences between 10 positive WP years and 10 negative WP years selected from the April WPI excluding ENSO years, it is found that rainfall amounts increase in April of positive WP years due to the following characteristics. Increases in rainfall amounts are evident in the East Asian middle latitudinal region where the positive correlation between the two variables is the highest and this is because anomalous southwesterlies are strengthened in the East Asian middle latitudinal region due to the spatial pattern of a south-low-north-high anomalous pressure system centered on this region that is made by anomalous anticyclones centered on the southeastern side of the region and other anomalous anticyclones centered on the northeastern side of the region. In addition, anomalous westerlies (jet) are strengthen in the upper troposphere of the East Asian middle latitudinal region and as a result, anomalous upward flows are strengthened in this region and thus anomalous warm air temperatures are formed in the entire level of the troposphere in the region. In addition to atmospheric environments, anomalous warm sea surface temperatures are formed in the seas in the East Asian middle latitudinal region to help the rainfall amount increases in the East Asian middle latitudinal region.

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References

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