酒泉市平均最高、最低气温及日较差变化

On Change in Mean Maximum Temperature,Minimum Temperature and Diurnal Range in Jiuquan City

利用酒泉市所属6个站点1959-2008年的月平均最高、最低气温和日较差资料,对近50年来酒泉市年、季平均最高、最低气温变化趋势的特征进行了分析。结果表明:(1)近50年来,酒泉市年和各季平均最高气温和最低气温呈现出显著的上升趋势,并且酒泉市平均最低气温大于平均最高气温的升高,即增暖现象在最低气温上表现的更为突出;(2)近50年来,酒泉市的年平均气温日较差呈减小趋势,下降幅度为每10年0.044℃,除秋季外,酒泉市各站各季日较差也呈线性减小趋势。

Based on monthly averaged surface air temperature data of six stations in Jiuquan during 1959-2008, the characteristics of change trends for mean maximum and minimum temperatures, as well as the daily temperature range are studied. The result shows：（1） In recent 50 years, both mean maximum temperatures and mean minimum temperatures have increased in Jiuqiuan, but increase in mean minimum temperatures is more dominant than that in maximum temperatures, which means the warming phenomenon is more significant in minimum temperatures; （2） Annual mean diurnal temperature range has decreased in recent 50 years. The temperature has dropped by 0.044℃. Beside Autumn, the daily temperature range has declined as well in every station every season.