Asia-Pacific Journal of Atmospheric Sciences

Korean Meteorological Society (한국기상학회)
권호 표지

The Regime Shift of the Northern Hemispheric Circulation Responsible for the Spring Drought in Korea

한반도 봄철 가뭄과 연관된 북반구 대기순환패턴의 변화

Kim, Sung;Park, Chung-Kyu;Kim, Meang-Ki
김성;박정규;김맹기

  • Published : 2005.08.31
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Abstract

This study investigated the characteristics of large scale atmospheric circulation in the Northern hemisphere associated with the springtime rainfall variations in Korea for the period from 1954 to 2003. The composite and Singular Value Decomposition (SVD) analyses indicate that the upper-level circulation pattern during the drought years is characterized by anomalous development of continental high over the northern part of the Eurasian continent related to the Eurasian wavetrain and weakening of the North Pacific high. The Rotated Empirical Orthogonal Function (REOF) analysis reveals that the Scandinavia teleconnection pattern (SCAND) and the North Pacific teleconnection pattern (NP) captured in the third and fourth modes, respectively, are closely associated with the springtime rainfall variation in Korea. The El Nino-Southern Oscillation (ENSO) and Arctic Oscillation (AO) patterns are captured as the two most dominant modes during the springtime, but their impact on the springtime rainfall variation in Korea appears to be less significant. It is interesting to note that SCAND has a stronger connection with the springtime rainfall variation before the mid-1980s, while NP has a stronger signal after the mid-1980s. It is found that the dominant signal of atmospheric circulation responsible for the spring drought varies with inter-decadal time-scale and the circulation pattern over the western North Pacific has more crucial impact on the springtime rainfall variation in recent years.

Keywords

References

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