Journal of the Korean Geographical Society (대한지리학회지)

The Korean Geographical Society (대한지리학회)
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Difference of Synoptic Characteristics according to the Persistence of Rainfall in Korea during the Changma Season

장마철 우리나라 강수의 지속성에 따른 종관 특성의 차이

  • Park, Byong-Ik (Department of Geography Education, Seoul National University)
  • 박병익 (서울대학교 지리교육과)
  • Received : 2010.10.11
  • Accepted : 2010.12.06
  • Published : 2010.12.31
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Abstract

This study aims to investigate the difference of synoptic characteristics over East Asia according to the persistence of rainfall in Korea during the Changma season (June and July). In the cases of consecutive rainfall which lasts four or more days, there are developed ridges in 850hPa level east of the Korean peninsula which introduce stagnation of the synoptic cyclone over Korea. An cold area in 850hPa level moves southward from the Northern China in one day before the beginning the rainfall day in Korea and it aids the development of the stationary front in East Asia. When rainfall lasts a day or two, cyclones pass over Korea in rainy day and the stationary front in East Asia is not intensified. In both cases the synoptic cyclones near the Korean peninsula shows a deep-baroclinic structure, while in the former cases over the southwestern part of Japan a subtropical frontal zone which has a shallow structure appears near Japan. In latter cases the frontal structures are same near Korea and Japan. So, this means that the Changma is not necessarily similar to the Baiu of Japan in all cases.

본 연구에서는 장마철 우리나라의 지역 평균 강수량을 이용하여 강수의 지속성에 따른 종관 특성의 차이를 살펴보았다. 그 결과 일강수량 10mm 이상이 4일 이상 지속되는 강수(장기 강수)와 1~2일에 그치는 강수(단기 강수) 사이에는 종관 특성에 차이가 있음을 알았다. 장기 강수의 경우 우리나라 동쪽에 기압능이 발달, 저기압과 전선의 정체를 유도하였고, 또 강수 1일 전에 찬 공기가 화중지방으로 남하, 전선이 활발해져 강수의 지속성에 기여하였다. 단기 강수의 경우 저기압이 우리나라를 정체 없이 통과하였다. 또한 장기 강수와 단기 강수의 경우에 우리나라 부근의 전선이 대류권 전체에 미치는 경압성이 큰 구조를 보였다. 장기 강수의 전선 구조가 일본 남서부 지역 장기 강수의 경우와 다르며, 단기 강수의 경우는 양 지역에서 같다. 이는 장마가 반드시 일본 바이우(Baiu)의 연장선상에 있는 것은 아님을 의미한다.

Keywords

References

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