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자료유형
학술저널
저자정보
저널정보
한국기상학회 Asia-Pacific Journal of Atmospheric Sciences Asia-Pacific Journal of Atmospheric Sciences Vol.45 No.3
발행연도
2009.8
수록면
247 - 264 (18page)

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초록· 키워드

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Springtime droughts in Korea were investigated to examine their characteristics and main causes using the Effective Drought Index (EDI). Data collected over a 96-year period (1910-2005) showed that May drought was milder than June drought and tended to continue into June. Regime shift analysis showed that 1931-1951 was a period of severe May drought. To analyze the general characteristics of May drought occurrence, we utilized empirical orthogonal function (EOF) analysis to select 12 drought years having a particular pattern of north-positive and south-negative (N+S-) anomalies for sea surface temperature in the North Pacific out of 21 occurrences of May drought in Korea over 56 years (1950-2005). The selected N+S- years were also found to have strong anomalies in themeteorological fields of temperature, geopotential height, and specific humidity due to strong meridional dipole patterns across 45°N in the North Pacific in both the low and mid-troposphere for several months before the droughts occurred. The development of this pattern is believed to cause a decreased Albedo due to a decreased sea ice extent in the Bering Sea and Okhotsk Sea (50°N-70°N, 140°E-160°W). Therefore, the cause of May drought is investigated as it accompanied decreases in the meridional temperature and pressure gradients and resulting decreases in the baroclinicity and precipitation in the mid-latitudes. In addition, an enhanced virtual easterly appeared both at the low and mid-troposphere between 35°N and 50°N in the wind anomaly field in the selected drought years. The wind begins in the central North Pacific, flows as a northeasterly into the Korean region, and outward as awesterly or northwesterly. Consequently, May drought in Korea was investigated and was found to be caused primarily by a decrease in precipitation due to the southward movement of a predominant storm track in May.

목차

Abstract
1. Introduction
2. Data & Methodology
3. Characteristics of May drought occurrence
4. Decrease in the meridional gradient and baroclinicity due to N+S- anomalies
5. Dipole patterns of anomalies and predictability of May drought occurrence
6. Enhanced virtual easterly and movement southward of predominant storm tracks
7. Effect of the decrease in the extent of sea ice and a weakened Aleutian Low
8. Summary and discussion
Acknowledgement
REFERENCES

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