湖北省60年代以来气温日较差的变化趋势

利用湖北省７２站１９６１￣１９９５年逐月最高、最低气温资料，计算并详细分析了湖北省年、四季及逐月气温日较差的线性变化趋势。结果表明：（１）年最低气温呈明显上升趋势，而最高气温为下降趋势，因此气温日较差呈显著减少趋势。（２）就四季来看，最高气温在春、夏、冬季均呈下降趋势，但只有夏季的下降趋势是显著的，秋季呈弱上升趋势；最低气温在四季均呈上升趋势，但只有冬季的上升趋势是显著的；气温日较差在冬季与夏季均

THE CHANGE OF THE DIURNAL TEMPERATURE RANGE IN HUBEI PROVINCE SINCE 1960' S

Monthly mean maximum and minimum temperatures in 72 stations from 1961 to 1995 inHubei Province were employed, and the linear trends of change of the diurnal temperature range. tin year, season and month were calculated and analysed in detail. The results are as follows: (1 )annually, mean minimum temperatures are significantly increasing, but the mean maximum temperatures are decreasing, therefore, the diurnal temperature range are obviously decreasing. (2)seasonly, the mean maximum temperatures are decreasing in spring, summer and winter, but thedecrease is significant only in summer, the mean maximum temperatures being slightly increasingin autum; the mean minimum temperatures are increasing in all the seasons, but the increase is obvious only in the winter; the diurnal temperature ranges are significantly decreasing in winter andsummerl but the decreasing rate is the biggest in winter. (3) monthly, there are seven monthswith the mean maximum temperatures decreasing, but the decrease is obvious in March, June andJuly, with the biggest decreasing rate in March; there are eight months with the mean minimumtemperatures increasing, but the increase is significant only in three months in winter; there arenine months with the diurnal temperature decreasing, but the decrease is obvious in January,March, June, July and August, with the biggest deceasing rate in January.