中文摘要：

选取1961年1月1日-2013年12月31日兰州市逐日气温数据,定量计算近50 a兰州市周末效应的强度,分析其不同时间尺度的变化特征,探讨人为规定的其他节假日是否存在相似的现象.结果表明在年代际尺度上,兰州市周末效应强度在20世纪60-80年代表现为在0附近波动,自80年代开始呈现显著的增强趋势,90年代以来趋于减弱,近10a来周末效应不再明显.在季节尺度上,冬季周末效应强度高于其他季节.自2008年以来,兰州市城市气候的假日效应表现较为明显.表明随着城市发展及人类活动的增强,人类活动在工作日与在周末对气候的影响程度由存在明显差异变为基本一致,在冬季周末对气候的影响逐渐增强,在假日对气候的影响更为显著.

英文摘要：

Changes in the weekend effect index of Lanzhou City during the recent 50 years were calculated using the daily meteorological data,and the changes at different temporal scales were discussed.Whether a similar effect existed or not in holidays was discussed.The results revealed that the intensity of weekend effect in Lanzhou City fluctuated around zero during 1960s-1980 s,then raised after 1980 s and decreased after 1990 s,indicating an obscure weekend effect in recent years.The intensity of weekend effect was higher in winter than in other seasons.The similar effect on holidays has been relatively prominent since 2008.The results demonstrate that,with a higher intensity of human activity,the differences in human activity intensity impacting on the climate between weekdays and weekends slightly decreased,and human activities impacted on climate at the weekend of winters have been strengthened gradually.Human activities on holidays have had a higher impact on the urban climate than that on working days.