[目的]分析近57年本溪山区日照变化特征.[方法]利用本溪市草河口气象站1954 ～ 2010年逐月日照时数以及与相关的总云量、水汽压和≥0.1 mm降水日数等气候资料,运用线性倾向率、Mann-Kendall和小波分析等方法,对近57年本溪山区日照时数的变化特征及影响日照减少的可能气象因素进行分析.[结果]近57年来,本溪山区除冬季日照时数呈不显著增长趋势外,其他年、季日照时数呈显著减少趋势；年日照时数在1971年发生突变.总云量、水汽压和≥0.1 mm降水日数对日照时数影响比较明显,但日照时数并不是简单随着云量和≥0.1 mm降水日数的减少而增加,说明影响日照时数变化影响因素比较复杂.[结论]该研究为合理利用山区光能资源,调整农业产业结构和促进农业经济可持续发展提供科学依据.%[ Objective ] The aim was to analyze the change characteristics of sunshine in Benxi mountainous area in recent 57 years. [ Method] Based on the data of monthly sunshine hours, total cloudiness, vapor pressure and ≥0.1 mm precipitation days from Caohekou weather station during 1954 -2010, by using linear tendency rate, Mann-Kendall method and wavelet analysis, the change characteristics of sunshine hours in Benxi mountainous area in recent 57 years were analysed, as well as the possible climatic factors resulting in the decrease of sunshine hours. [ Result] In recent 57 years, except for the slight increase of sunshine hours in winter, annual sunshine hours and other seasonal sunshine hours showed significant decreasing trend, and annual sunshine hours varied suddenly in 1971. In addition, total cloudiness, vapor pressure and ≥0.1 mm precipitation days affected sunshine hours obviously, but sunshine hours didn't simply increase as the reduction of total cloudiness and ≥0.1 mm precipitation days, which showed that the influencing factors of sunshine hours were complex. [Conclusion] The study could provide scientific references for the reasonable utilization of light energy in mountainous area, adjustment of agricultural industrial structure and sustainable development of agricultural economy.
展开▼
