Abstract:

Abstract:By using the agricultural critical temperature data (≥0℃,≥5℃,≥10℃) from three stations in the southernmargin of Qaidam basin during the period of1961-2007, the temporal-spatial changes of the first and the lastdaywhen dailymean temperaturewas above 0℃, 5℃and 10℃all thewhile, the interval days of them, aswell as the accumulated temperature(≥0℃,≥5℃,≥10℃) have been analyzed. The results show that the firstdaymoved earlier and the lastday came later for each critical temperature, so the interval days between the first and the lastday above 0℃, 5℃and 10℃increased, and the accumulated temperature presented increasing trend also in the southern margin ofQaidam basin. The variation characteristic for each critical temperature was inconsistently in different areas and decades.

Key words: critical temperature, accumulated temperature, climatic change

摘要：

用柴达木盆地南缘3个气象观测站1961~2007年≥0℃、≥5℃、≥10℃界限温度资料,分析了日平均气温稳定通过各界限温度的初日、终日、积温及初终间日数的时空变化特征。结果发现柴达木盆地南缘各界限温度时空变化均呈现初日提前、终日推迟、积温和初终间日数增加的趋势,地区和年代际不同各界限温度变化不一致。

关键词: 界限温度, 积温, 气候变化