近46年商丘市日照时数变化特征分析

The Variation Characteristics of Sunshine Duration in Shangqiu of Recent 46 Years

选用商丘市8个气象站点1965年3月—2010年2月的日照时数资料,采用趋势分析和滑动t检验等方法,分析商丘市日照时数时空变化特征及气候突变年.结果显示:商丘市年、季、月日照时数都在减少,年日照时数以-125.911 h/10a呈极显著的减少趋势,年代日照时数变化从20世纪60年代的最多逐年代波动下降到本世纪的最少;四季日照时数变化减少趋势明显,但幅度不同,夏季>秋季>冬季>春季;各月日照时数变化以8月减少幅度最大.年、季、月日照时数时间序列存在有明显的突变.日照时数的空间变化,8个站点年季平均日照时数均呈不同的减少趋势,商丘站日照时数减速最大,其主要原因之一是城市空气污染较乡镇空气污染逐年加重的快.

Using the sunshine duration materials of March 1965 to February 2010 of 8 meteorological stations in Shangqiu,by trend analysis and runningt test,the author analyzes sunshine duration and temporal and spatial variation characteristics and the turning point year of climate in Shangqiu. The results showed that sunshine durations of Shangqiu reduced respectively in years, seasons and months. Sunshine duration of every year significantly decreased with a trend of-125.911 h/10a and sunshine duration of every decade changed from the biggest data in 1960s to the least data in 21st century year by year. Sunshine duration of every season reduced obviously, but the amplitudes of variation of four seasons were different： summer＇ s〉spring＇ s〉autumn＇ s〉winter＇ s. The sunshine duration in August reduced with the largest drop. The sequence of sunshine duration of every year, season and month mutated obviously. In terms of the temporal and spatial variation of sunshine duration, annual average sunshine duration of 8 stations reduced in different trends. The annual average sunshine duration of Shangqiu station reduced with the largest rate and the main reason was that air pollution increased more serious and faster in cities than in towns year by year.