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논문 기본 정보

자료유형
학술저널
저자정보
저널정보
한국기상학회 Asia-Pacific Journal of Atmospheric Sciences Asia-Pacific Journal of Atmospheric Sciences Vol.44 No.1
발행연도
2008.2
수록면
49 - 68 (20page)

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초록· 키워드

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In this study, the solution of the Sawyer-Eliassen (S-E) equation was calculated to investigate the synoptic-scale dynamics responsible for the heavy rainfall that occurred during September 10-12, 1990. A large meridional gradient of potential temperature appears near the 300-? level just below the upper-level jet located in the northern region of the Korean Peninsula. In this region, positive geostrophic stretching deformation forcings contribute toward the formation of a direct circulation whose center lies close to the 500-? level when the geostrophic wind converges along the meridional direction. The existence of warm air in the west and cold air in the east up to the south of the 200-? upper-level jet induces the formation of a negative geostrophic shearing deformation forcing. This forcing induces an indirect circulation whose center lies close to the south of the heavy precipitation region at the 250-? level. Therefore, the indirect and direct circulations over the regions to the south and north of the heavy precipitation region, respectively, induce a strong upward motion over the heavy precipitation region. The upward motion induced by the direct and indirect circulations accelerates to elevate the accumulated moisture to a significantly high level. This results in the enhanced release of latent heat due to the condensation of the elevated moist air. The latent heat contributes toward the diabatic heating forcing, which also induces the considerable intensification of the direct and indirect circulations over the northern and southern regions of the heavy rainfall area, respectively. In the solution of the S-E equation, the secondary circulation induced by synoptic environments, which resembles the secondary circulation induced by diabatic heating alone, is a primary mechanism responsible for the development of the heavy rainfall. In this case, diabatic heating plays a role as the most significant forcing in the solution of the S-E equation. The geostrophic shearing deformation and diabatic heating forcings contribute toward the horizontal intensity and the extent of the indirect circulation below 700 ? up to the south of the heavy rainfall region.

목차

Abstract
1. Introduction
2. Data and Method
3. Synoptic Background of the Heavy Rainfall Case
4. Diagnostic Analysis
5. Conclusion
Acknowledgements
REFERENCES

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