| 河南日照变化特征及成因分析 |
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| 引用本文： | 贾金明,吴建河,徐巧真,张明捷,毛桂萍,李汉浸,刘平,王春玲.河南日照变化特征及成因分析[J].气象科技,2007,35(5):655-660. |
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| 作者姓名： | 贾金明 吴建河 徐巧真 张明捷 毛桂萍 李汉浸 刘平 王春玲 |
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| 作者单位： | 河南省濮阳市气象局,濮阳,457000 |
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| 基金项目： | 科技部农业科技成果转化基金 |
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| 摘 要： | 利用线性分析方法,根据河南31个站1954~2005年的日照资料分析了河南省及濮阳市的日照变化特征。结果表明,河南省年日照时数呈减少趋势,平均减少每10年74.2 h,东部平原地区年日照时数的递减幅度明显大于西部山区年日照时数的递减幅度。濮阳市年日照时数的递减幅度为每10年135 h,冬季与夏季日照的递减幅度大于春季和秋季日照递减幅度,日照时数减少时段主要发生在日出后和日落前太阳高度角较低的两段时间内。造成日照减少的气候原因主要是空气污染逐年加重,加之风速逐年减小,利于大气气溶胶在低空积聚,空气湿度增大,轻雾日数增多,造成大气透明度降低。非气候因素的影响主要是观测场周围障碍物高度角逐年增高,遮挡了部分阳光,使记录到的日照时数减少,气候因素对日照的影响大于非气候因素的影响。
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| 关 键 词： | 日照时数 线性分析 变化趋势 成因 |
| 收稿时间： | 2006/8/24 0:00:00 |
| 修稿时间： | 2006-08-24 |
Features of Sunshine Duration Variation and Its Cause Analysis |
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| Jia Jinming,Wu Jianhe,Xu Qiaozhen,Zhang Mingjie,Mao Guiping,Li Hanjin,Liu Ping and Wang Chunling.Features of Sunshine Duration Variation and Its Cause Analysis[J].Meteorological Science and Technology,2007,35(5):655-660. |
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| Authors: | Jia Jinming Wu Jianhe Xu Qiaozhen Zhang Mingjie Mao Guiping Li Hanjin Liu Ping and Wang Chunling |
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| Institution: | Puyang Meteorological Bureau, Henain Province, Puyang 457000 |
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| Abstract: | The features of sunshine duration variation in Henan Province and Puyang are analyzed with the linear analysis method by means of the data of 1994 to 2005 from 32 stations.The results indicate that sunshine duration in Henan Province decreased with a tendency of 74.2 hours per ten years,and the decreasing amplitude over the eastern plain areas was obviously greater than those in the western mountainous areas.At Puyang,the sunshine duration decreased by 135 hours per 10 years,with a bigger decreasing amplitude in winter and summer than in spring and autumn.The decrease occured mostly after sunrise and before sunset when the solar altitude angle was relatively low.The meteorological causes include the more and more serious air pollution on an annual basis and the wind velocity decrease,which are favorable for the accumulation of the atmospheric aerosols in the atmosphere at low altitudes and the increase of air humidity and light fog days,resulting in the decrease of atmospheric transparency.The main non-meteorological factor is that the altitude angle of the obstructions around the observation station is getting higher on an annual basis,which results in the partly sheltering of sunshine.The influence of meteorological factors surpasses that of non-meteorological factors. |
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| Keywords: | sunshine duration linear analysis variation tendency cause |
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