【摘要】 利用 195 1～ 2 0 0 0年全国 2 4 1个测站 1、4、7、10月 (分别代表冬、春、夏、秋四季 )及年平均的日最低气温资料 ,将全国划分为 8个区域 ,并对不同区域在不同季节的日最低气温的变化特征进行了研究 ,通过研究发现 :在全球气候变暖的背景下 ,日最低气温的增温是极为显著的 ,尤其是 80年代中期之后 ,北方地区的增温比南方地区和青藏高原更加明显。 70年代中期前后 ,日最低气温发生了近 5 0 a来的第一次变暖突变 ,此次变暖的趋势并不明显 ,而是以波动的形表现出来 ,80年代中期之后 ,出现了趋势极为明显的第二次变暖突变。通过对不同季节资料的研究还发现 ,在南方及青藏高原地区夏季日最低气温有下降的趋势更多还原

【Abstract】 Based on the data of daily mean minimum air temperature of year and in January,April,July,October (standing for winter,spring,summer and autumn respectively)from 241 stations in 1951～2000,we divided the whole nation into eight regions,and studied the characteristics of daily minimum air temperature in different regions and seasons.By the research we found that:under the background of the global climate warming,the increase of daily minimum air temperature is remarkble.Especially in the late part of the mid 1980s,the increase in the North of China is more conspicuous than in the South of China and the Qingzang plateau.During the 50 years,the first warming catastrophe of daily minimum air temperature takes place around the mid 1970s.The warming trend in this time isn′t significant ,mainly in the form of fluctuation.There is the second warming catastrophe after the mid 1980s,the warming trend in this time is significant.By studying the data of different seasons,we still found that the dayily minimum air temperature has a trend of decline in the South of China and the Qingzang plateau.更多还原