| 近43a山西东南部日照时数时空变化特征及其影响因素 |
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| 引用本文： | 李晶晶,张卉,王艳,赵尚卓,裴育.近43a山西东南部日照时数时空变化特征及其影响因素[J].高原山地气象研究,2021,41(3):82-87. |
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| 作者姓名： | 李晶晶 张卉 王艳 赵尚卓 裴育 |
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| 作者单位： | 山西省长治市气象局，长治 046000 |
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| 基金项目： | 山西省气象局面上项目（SXKMSTC20207132） |
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| 摘 要： | 基于1976~2018年山西东南部11个地面气象观测站的逐月日照时数资料，分析了近43a山西东南部日照时数的时空变化特征，以及总云量、低云量、水汽压、降水量、雾日数和霾日数等气象因子对日照时数的影响。结果表明:山西东南部平均年日照时数空间差异显著，呈南北多、东西和中部少的分布特征；近43a年山西东南部日照时数呈显著减少趋势，气候倾向率为?71.9h/10a，2005年发生由多转少的突变；四季日照时数由多到少依次为春季、夏季、秋季及冬季，均呈减少趋势，其中春季趋势最小，秋季趋势最大；各月日照时数分布不均匀，5月最多，2月最少，除3月日照时数呈增加趋势外，其余各月均呈减少趋势，6月和9月的减少趋势最为显著；近43a总云量、雾日数、霾日数均呈显著增加趋势，而低云量、水汽压、降水量变化趋势不显著；雾日数增加是导致春季、秋季、冬季和年日照时数减少的重要因子之一，总云量增加是导致夏季、秋季、冬季和年日照时数减少的重要因子之一，降水量增加对夏季日照时数减少也有一定影响。
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| 关 键 词： | 日照时数 变化特征 相关性 山西东南部 |
| 收稿时间： | 2021-03-31 |
Temporal and Spatial Variation of Sunshine Duration and Its Influencing Factors in Southeast Shanxi in Recent 43 Years |
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| Institution: | Changzhi Meteorological Bureau, Changzhi 046000, China |
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| Abstract: | Based on the monthly sunshine hours data of 11 surface meteorological stations in southeast Shanxi from 1976 to 2018, the temporal and spatial variation characteristics of sunshine hours in southeast Shanxi in recent 43 years were analyzed, and the effects of meteorological factors such as total cloud amount, low cloud amount, water vapor pressure, precipitation, fog days and haze days on sunshine hours were analyzed. The results shows that the spatial difference of annual average sunshine duration in the southeast of Shanxi is obviously, showing the distribution characteristics of more north and south, less east and west, and less middle.The sunshine duration in southeastern Shanxi in recent 43 years showed a significant decrease trend, with an average decrease of 71.9 hours per 10 years, and the abrupt change of annual sunshine duration occurred in 2005. Sunshine duration in all seasons showed a consistent decreasing trend, with the slowest deceleration in spring and the biggest deceleration in autumn. Among the monthly sunshine duration, June and September contributed the most to the reduction of annual sunshine duration. In recent 43 years, the total cloud amount, the number of fog days and haze days showed a significant increase trend overall, but the changes in low cloud amount, water vapor pressure, and precipitation were not significant. The increase of fog days is one of the important factors leading to the decrease of sunshine hours in spring, autumn, winter and annual. The increas of total cloud amount is one of the important factors leading to the decrease of sunshine hours in summer, autumn, winter and annual. In addition, the increased precipitation also has a certain impact on the decrease in summer sunshine hours. |
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