【摘要】 利用兰州1932—2002年逐月地面月平均温度资料,分析了兰州71年来温度的基本气候特征、年代际变化、突变、异常冷暖和变化趋势等。分析表明:71年来年和四季气温大体都经历了两个暖期和一个冷期,第一暖期的增暖主要在春、夏、秋季,冬季则处在冷期中;第二暖期首先从冬季开始,四季间相隔1~2年后陆续大幅度增暖,第二暖期增暖幅度明显高于第一暖期,持续时间也长于第一暖期,最大的特点是四季同时增暖,冬季增暖幅度最大。1960年代是最冷的10年,以夏季降温最为明显;1990年代是最暖的10年,以冬季增暖最为明显。1990年代发生异常的频次最高,其次是1960年代和1970年代,最少的是1980年代。71年来,兰州年平均气温以1.4℃/100a线性趋势上升,高于北半球和全国水平,近10年冬秋季增温率最大。更多还原

【Abstract】 Using the month-to-month surface average air temperature of Lanzhou from 1932 to 2002,the basic weather characteristic,interdecadal change,abnomal cold and warm change trends of temperature in Lanzhou in 71 years are analyzed.The analyzed results show that there are two warm periods and a cold period about the air temperature of four seasons in 71 years.The warming of first warm period is mainly in spring,summer and autumn,and winter is in the cold period.The second warm periods first start from winter,there is continuous significant warming after an interval of 1~2 years among four seasons.The warming argument in the second warm periods is obvious higher than that of the first warm period,and its duration is longer than that of one too.The significant feature of four seasons is to warm at the same time,the warming argument in winter is the biggest.The 1960′s is the coldest 10 years,the temperature drop in summer is the most obvious.The 1990′s is the warmest 10 years.the winter warming is the most obvious. The abnomal frequency occurred in 1990′s is the most,next in the 1960′s and 1970′s,and the least in the 1980′s.The average air temperature has rised with linear trend of 1.4℃/100a in Lanzhou since 71 years,the rate of temperature increasing in winter and autumn is the highest in the last 10 years.更多还原