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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 한국기상학회 Asia-Pacific Journal of Atmospheric Sciences Journal of the Korean Meteorological Society Vol.43 No.2
- 발행연도
- 2007.5
- 수록면
- 59 - 75 (17page)
이용수
초록· 키워드
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After this study took notice of distinctive changes of the 20-yr (1979~1998) mean meridional wind direction between summer season and winter season over East Asia, the duration of the lower-level southerlies averaged over East Asia is defined as the Warm Season (WS). And the spatial and temporal characteristics of the Onset and Withdrawal Dates (OWDs) of the mean southerlies are investigated. Through various trials, the OWDs of WS are defined as the day when the mean southerly starts at 925 hPa and as the day when the mean northerly starts at 1000 hPa, respectively. Using these definitions, WS over East Asia is concluded as the climatological period from April 2 to September 22. These dates are verified with the results defined by temperature advection, the land-sea thermal and pressure contrasts, and some others using the Empirical Orthogonal Function (EOF). Eventually, WS starts with Spring Rainy Period (SRP), passes through summer rainy season, and ends when Autumn Rainy Period (ARP) withdraws over Korea and some parts of East Asia, which coincides well with the period of the hydrological summer monsoon season. The inter-annual variations of OWDs show good correlations with land-sea thermal and pressure contrasts. It reflects that the earlier the onset and the later the withdrawal are, the stronger the South Asian High (SAH) and the Western North Pacific subtropical High (WNPH) are. The WS over East Asia begins first from two early start axes of the WS and spreads northward and southward centering on these two start axes. One axis is located over the western edge of the western North Pacific and the other lie along the coast of East Asia where the land-sea breeze is supposed to be dominant. Also, WS withdraws first along the early end axis that located at 35°~40°N and spreads northward and southward together. Therefore, this study suggests that the WS neither always start from the south nor always end from the north.
목차
Abstract
1. Introduction
2. Data and analysis
3. Definition of OWD of WS by using the climatological daily mean data
4. Inter-annual variations of OWDs
5. Difference between the early and late OWDs
6. Spatial distribution of OWDs
7. Summary and conclusions
Acknowledgement
REFERENCES
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