Abstract:

The change of the 0℃level height in summer over the northeast side of the Qilian Mountain was analyzed, and the relationshipbetween the 0 `C; level height and surface temperature, precipitation, water vapor content in atmosphere and stream flow of inland rivers were discussed. Results show ; (1) The 0℃level height was obviously higher than normal in the late 1950s and the 1960s, and lower in the 1980s. It presented downward irend from the late 1960s to 1970x, and upward trend in the 1980s and 1990x, and it downward again in the first 4 years of the 21 s2 century; ( 2 ) From May to September, the positive correlation was found between the 0℃level height and surface temperature, water vapor content in atmosphere, and it was negatively correlated with precipitation, and there was low correlation

摘要：

分析了祁连山东北侧高空零度气温层高度的变化特征，探讨了零度层高度与地面气温、降水量、空中水汽含量、内陆河流量的相关性特征。研究表明:(1)在zo世纪so年代后期和6o年代零度层高度明显偏高，80年代明显偏低，}o年代后期到}o年代零度层高度基本上呈下降趋势，so一90年代呈上升趋势，21世纪前4。又呈下降趋势。(2)5 -9月历年零度层高度与地面气温、空中水汽含量的变化在同时间段内基本一致，呈正相关性;而与降水量变化表现出明显的负相关性;与内陆河流量变化相关性不明显。

关键词: 祁连山, 零度层高度, 变化特征, 相关性