邢台地区40年来日照时数变化趋势分析

Analysis on Change Trend of Sunshine Hours in Xingtai Area in Recent 40 Years

[目的]分析近40年来邢台地区日照时数变化趋势。[方法]选取邢台、沙河、内丘1971～2010年的逐年及季总日照时数资料,采用折线图、趋势图以及气候变率分析年、季日照时数的变化特征。[结果]1971～2010年邢台、沙河、内丘的年日照时数均呈现出系统减少的趋势,3站平均以77.7 h/10 a的速率减少,以邢台减少最为显著,内丘次之;3站的春、夏、秋、冬季的总日照时数均呈现出系统减少的趋势,以邢台减少最为显著,3站平均分别以10.7、18.7、21.6、26.6 h/10 a的速率迅速减少;无论年还是四季总日照时数均以邢台最为显著,体现出城市的浑浊岛效应特征;就3站的40年平均而言,冬、春、夏、秋季的季总日照时数为485.5、691.4、631.7、551.1 h,说明春季的日照最为充足,其次为夏季,冬季的气层稳定,日照时数最少。影响日照时数减少的原因主要是城镇化发展及污染物排放的加剧。[结论]该研究为合理利用农业气候资源、改善生态环境和促进农业经济的发展提供科学依据。

[Objective] The research aimed to analyze variation trend of sunshine hours in Xingtai area in recent 40 years.[Method] Based on yearly and seasonal total sunshine hours data in Xingtai,Shahe and Neiqiu during 1971-2010,the change characteristics of annual and seasonal sunshine hours were analyzed by using line chart,trend chart and climatic variability.[Result] The annual sunshine hours in Xingtai,Shahe and Neiqiu during 1971-2010 all showed systemic decrease tendency.The decrease in Xingtai was the most significant.The second one was Neiqiu.The average decrease velocity of three stations was 77.7 h/10 a.The total sunshine hours of three stations in spring,summer,autumn and winter all presented systemic decrease tendency.The decrease of Xingtai was the most.The average decrease rates of three station in spring,summer,autumn and winter were respectively 10.7,18.7,21.6 and 26.6 h/10 a.Whether the annual or seasonal total sunshine hours,the decrease of Xingtai was the most significant,reflecting urban turbidity island effect feature.In the case of three-station mean in 40 years,the total sunshine hours in winter,spring,summer and autumn were respectively 485.5,691.4,631.7 and 551.1 h.It illustrated that spring sunshine was the most,followed by summer sunshine.The gas blanket in winter was stable,and the sunshine hours were the least.The main reason of sunshine hours decrease was urbanization development and aggravation of pollutant discharge.[Conclusion] The research provided scientific basis for reasonably using agricultural climate resources,improving ecological environment and promoting development of agricultural economy.