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자료유형
학술저널
저자정보
저널정보
한국기상학회 Asia-Pacific Journal of Atmospheric Sciences 한국기상학회지 제40권 제5호
발행연도
2004.10
수록면
571 - 586 (16page)

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The characteristics of sunshine duration and cloudiness in Seoul are investigated for the period of 1970 to 1999. A simple empirical model is set up to evaluate monthly sunshine duration on the basis of the daily averaged cloudiness. Annually averaged sunshine duration in Seoul is about 2,150 hours for the period of 1970-1999. Seasonally averaged sunshine duration is the minimum in summer while mean cloudiness is the maximum in summer. Daily averaged sunshine duration indicates the maximum at noon and minimum in sunrise and sunset. Over this 30-year period, linear regression analysis indicated a 12.5% decrease in cloudiness, but 5.3% increase in sunshine. Changes of Cloudiness in Seoul during this period are greater in autumn and winter than in spring and summer. Percent of sunshine indicates the maximum changes in summer and minimum in spring. There is a significant correlation of -0.86 between monthly cloudiness and sunshine duration trends during the 30 years. This correlation is showed high in winter and relatively low in spring because dust, smoke and haze may have a large effect on sunshine duration. A linear regression on monthly sunshine versus the number of clear, partly cloudy, cloudy and overcast days was fitted by a least-squares method for 30 years of observation in Seoul. A very good agreement between observed and calculated values of sunshine duration was found. The method seems a suitable tool for evaluating actual sunshine in similar climate.

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1. 서론
2. 자료 및 일조계
3. 분석
4. 결과 및 토의
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