摘要
利用三门峡市1971-2010年日照等观测资料,对三门峡市40年来日照时数变化特征进行了分析。结果表明:三门峡市的日照时数呈现减少趋势,80年代减幅较大,90年代又呈现小幅增长的趋势,年日照时数减少幅度为7.4小时/年,春夏秋冬各季均有减少,但减少的气候倾向率不同,减幅夏季﹥秋季﹥冬季﹥春季;日照时数的月变化明显,与副热带高压的南移有关。通过对影响日照时数的因子进行分析时发现,云量和相对湿度都不是引起三门峡市区日照减少的主要原因。在1971-2010年的资料中,14:00每月平均能见度与每月平均日照时数的一致走势以及日照时数与能见度间的高相关系数均说明,三门峡市日照时数的减少可能主要是由地面能见度下降引起的,地面能见度下降的引起主要是由于空气污染的加重,气溶胶颗粒浓度的增加引起的。
The 40 years of variation characteristics of sunshine duration were analyzed by using the annual sunshine observation data that from 1971 to 2010 of Sanmenxia. The results showed that: the sunshine hours showed a decreasing trend, the reduction is large of 80th,but that shows small growth trend of 90th among them, The reduced amplitude is 7.4 hours / year of sunshine hours,seasons each Ji Jun has decreased, but reduce the climate tendency rate, decrease the summer winter > autumn > > spring; sunshine a few months changed significantly, and the subtropical south move about. Through the influence of sunshine hours in the factor analysis found, total cloudiness and relative humidity are not caused by the main reason for the decrease in urban area of Sanmenxia city. In 1971-2010 year data,14:00 monthly average visibility and monthly average sunshine hours in the consistent trend and sunshine hours and the visibility of the high correlation coefficients were illustrated, sunshine duration in Sanmenxia city to reduce possible mainly by the ground visibility caused by the drop in the ground, reduced visibility caused mainly due to air pollution exacerbations, aerosol particle concentration increase induced by.
出处
《河南科技》
2013年第11X期179-182,共4页
Henan Science and Technology
关键词
日照时数
变化特征
原因分析
影响
Sunshine hours
change characteristic
cause analysis
influence
