摘 要：
在气候变暖背景下,分析西藏0℃界限温度变化的时空分布特征,以期合理开发农业气候资源。利用西藏38个站点1981—2014年逐日平均气温资料,采用气候倾向率、M-K和距平等统计方法,对西藏≥0℃初日、终日、持续日数及积温的时空分布特征进行分析。结果表明:近34年西藏平均每10年≥0℃初日提早3.1天、终日推迟1.9天、持续日数延长5.0天和积温增加83.2℃·d,这种变化在低海拔地区表现的更明显。大部分站点≥0℃界限温度都表现初日提早、终日推迟、持续日数延长和积温增多的年代际变化特征。≥0℃初日和积温的突变点出现在21世纪初,终日突变时间早,发生在20世纪80年代后期,而持续日数在90年代中后期出现了突变。
译 名：
Spatial and Temporal Distribution of 0℃ Boundary Temperature Change in Tibet During 1981-2014
作 者：
Ma Pengfei;Du Jun;Du Xiaohui;Tibet Climatic Centre;Lhasa Meteorological Service;
关键词：
0℃ boundary temperature;;variation trend;;climate abrupt change;;Tibet
摘 要：
Under the background of climate warming, the authors studied the change characteristics of 0℃boundary temperature in Tibet, in order to rationally develop agricultural climate resources. Based on the dailyair temperature data of 38 meteorological stations from 1981 to 2014, by using the linear trend method, the M-Kmethod and anomaly, several elements were analyzed, including the beginning day, terminal day, duration andaccumulated temperature of the daily temperature above 0℃ stably. The results showed that the beginning daywas in advanced with a rate of 3.1 d/10 a, the ending day was delayed with a rate of 1.9 d/10 a, the durationwas increased 5.0 days per decade, and the accumulated temperature of the daily temperature above 0℃ stablyhad an increasing trend, which increased 83.2℃ per decade in Tibet, and the change was more obvious inlower altitude. It was also found that the inter- decadal variation trend of the critical temperature ≥0℃presented the characteristics of earlier beginning day, delayed terminal day, prolonged duration and increasedaccumulated temperature in most part of Tibet. In Tibet, the climate mutation point of the first day and theaccumulated temperature occurred in the early 21 stcentury, the mutation time of the terminal day was in thelate 1980 s and that of the duration was in the mid-late 1990 s.
