【摘要】 分析了兰州 1932～ 2 0 0 2年年平均气温、年平均最高和最低气温及年平均气温日较差的气候变化特征。分析表明 :1932年以来 ,4个气温要素的线性增温率依次为每 10年 0 14℃、0 0 6℃、0 38℃、- 0 32℃。兰州 2 0世纪 4 0年代最高气温对增暖的贡献大 ,80年代最低气温对增暖的贡献大 ,而 90年代的异常偏暖表现为最高和最低气温的同时上升。另外 ,在 4 0年代各季平均最高和最低气温均呈相反的趋势 ,表现为最高气温的上升和最低气温的下降 ;在 195 0～ 1970年间最高和最低气温的变化趋势和幅度非常接近 ,但维持时间各季略有不同 ;80年代以来 ,最低和最高气温均在上升 ,但最低气温的增温率明显高于最高气温的增温率。更多还原

【Abstract】 The long-term variation characteristics of annual mean air temperature, annual mean maximum and minimum air temperature and mean daily range from 1932 to 2002 in Lanzhou are analyzed. The results indicate: since 1932, the increases rates of the four temperature parameters were 0 14 ℃ per 10 years, 0 06 ℃ per 10 years, 0 38 ℃ per 10 years, and -0 32 ℃ per 10 years, respectively. The contribution of maximum temperature to warming was the highest in the 1940’s and that of minimum temperature was the highest in the 1980’s in Lanzhou. The warming was resulted from both maximum and minimum temperature increases in the 1990. Moreover, average maximum and minimum temperatures for all seasons had contrary trends in the 1940’s: maximum temperature increased and minimum temperature decreased. The variation trends of maximum and minimum temperatures from 1950’s to 1970’s were very similar, but the persisting periods in different seasons are different. Since the 1980’s, both minimum and maximum temperatures increased and the increase rate of minimum temperature was obviously higher than that of maximum temperature.更多还原