桓仁地区近56年来日照变化特征分析

利用桓仁县近56年日照时数实测资料,分析了桓仁地区日照时数年代际、年际、各季和各月的气候变化特征以及与日照百分率、总云量、低云量和水汽压之间的关系。结果表明：桓仁地区年、季、月日照时数皆呈减少趋势,春季减少最快,冬季减幅最慢。桓仁地区各月的日照时数均呈减少趋势,其中5月减少的趋势较为显著,2月减少的趋势较弱。日照时数与日照百分率的年际变化基本保持一致。年日照时数在1992年附近发生突变。年低云量、水汽压略呈增加趋势,低云量、总云量和水汽压与日照时数变化呈显著的负相关,是桓仁地区日照时数减少的主要因素。

Analysis of Variation Characteristics of Sunshine in Recent 56 Years in Huanren Area

On the basis of 56 years of measured data concerning sunshine duration in Huanren County, the decadal, annual, seasonal, and monthly variation characteristics of sunshine duration in recent 56 years and its relationship with relative sunshine, total cloudiness, lower cloudiness and water vapour pressure in Huanren area are interpreted in this paper. It demonstrates that the annual, seasonal and monthly sunshine duration show a decreasing trend, decreasing with rapidest speed in spring and slowest speed in winter. The sunshine hours in each month in Huanren area tend to decline, among which the decreasing trend is more obvious in May and less in February. The annual variation of sunshine duration is consistent with sunshine percentage. Sudden change of sunshine duration occurred around 1992. Annual low cloudiness and vapour pressure are slightly increasing. The significantly negative correlation exists between sunshine hours and low cloudiness, and total cloud cover and water vapour pressure are the major factors responsible for decline in sunshine hours in Huanren area.