【摘要】 利用朔州市气象局观测站1961～2009年日照、云量、风速及烟、霾、浮尘、扬沙、沙尘暴等气象资料,采用数理统计方法,初步分析了朔州市日照时数的年、季、月的变化特征、趋势及引起日照时数变化的因子。结果表明:朔州市年日照时数呈明显的减少趋势,其趋势变化率为-118.1h/10a,并呈现出阶段性变化的特征;1980年之前为日照时数偏多期,1980年后日照时数开始减少,1990年后减少趋势明显加快;从季节变化来看四季总的趋势是减少的,其中夏季比较明显,且变化幅度最大,对年日照时数的变化影响较大;各月日照时数变化趋势基本一致,呈不同速率的减少趋势,其中5月最为明显。近50a朔州市的年风速呈明显减小趋势,尤其是20世纪90年代以后快速减小,与朔州市自1990年代起经济规模的快速增长特别是煤炭行业的快速发展及城市化进程加快相对应,说明人类活动特别是工业排放污染物的急剧增长,导致大气气溶胶增加,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,造成大气透明度降低,日照时数减少。更多还原

【Abstract】 Based on observations of sunshine hours,cloud amount,wind speed and other meteorological elements during 19612009 in Shuozhou,the annual,seasonal and monthly variation of sunshine hours and its influencing factors were analyzed in this paper. The results indicated that the annual sunshine hours presented obvious decreasing trend with-118. 1 h /10 a tendency rate,and this phenomena started in 1980 and after 1990 it was more obvious. The seasonal sunshine hours also presented decrease trend,especially in summer. And monthly variation of sunshine hours also decreased especially in May. The annual wind speed in Shuozhou also reduced in recent 50 years especially after 1990. The air pollution increased after 1990 and annual wind speed reduction in Shuozhou may be the important reason for sunshine hours reduction in these years.更多还原