Journal of the Korean earth science society (한국지구과학회지)

The Korean Earth Science Society (한국지구과학회)
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Relationship between rainfall in Korea and Antarctic Oscillation in June

6월의 남극진동이 한국의 6월 강우량에 미치는 영향

  • Choi, Ki Seon (National Typhoon Center, Korea Meteorological Administration) ;
  • Kim, Baek Jo (Policy Research Laboratory, National Institute of Meteorological Research) ;
  • Lee, Jong Ho (National Typhoon Center, Korea Meteorological Administration)
  • Received : 2013.03.09
  • Accepted : 2013.04.09
  • Published : 2013.04.30
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Abstract

This study examined the effect of the Antarctic Oscillation (AAO) in June on the June rainfall in Korea by using a correlational statistical analysis. Results showed that there is a highly positive correlation between the two variables. In other words, the June rainfall in Korea is influenced by the Mascarene High and Australian High that are strengthened in the Southern Hemisphere, which is a typical positive AAO pattern. When these two anomalous pressure systems strengthen, the cold cross-equatorial flows in the direction from the region around Australia to the equator are intensified, which in turn, force a western North Pacific subtropical high (WNPSH) to develop northward. This pressure development eventually drives the rain belt to head north. As a result, the Changma begins early in the positive AAO phase and the June rainfall increases in Korea. In addition, a WNPSH that develops more northward increases the landfall (or affecting) frequency of tropical cyclones in Korea, which plays an important role in increasing the June rainfall.

이 연구는 6월 남극진동이 한국 6월 강우량에 영향을 주는지 알아보기 위해 두 변수 사이에 상관분석이 이루어졌고 높은 양의 상관관계가 있음이 밝혀졌다. 이는 한국 6월 강우량이 같은 시기에 남반구에서 강화되는 머스커렌 고기압과 호주 고기압의 영향을 받음을 의미하는 것이다. 이 두 고기압이 발달할 때 호주 주위지역으로부터 적도방향으로 적도 횡단류가 강화되며, 이 적도 횡단류의 강화는 북태평양고기압의 북쪽으로의 강화로 이어진다. 이는 결국 장마전선을 한국으로 북상시키는 역할을 한다. 더욱이 북태평양 고기압의 북쪽으로의 강화는 한국에 상륙하거나 영향을 주는 태풍의 빈도를 증가시켜 6월 강우량의 증가에 중요한 역할을 한다.

Keywords

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