摘要
水资源短缺和合理利用是黑河流域面临的一个严峻问题,解决问题的关键就是要深入了解水循环过程.降水作为水循环中一个重要环节,分析其环境同位素变化特征是应用同位素示踪技术研究水循环过程所必须的前提.根据黑河流域中上游地区取得的降水水样和降水气象资料,分析了该区域降水中δ18O的变化特征.结果表明:降水δ18O受降水量、季节、高度和温度等众多因素综合影响,其中温度占主导地位;由于位于干旱内陆地区,降水中δ18O的季节变化幅度较大,可达20‰以上;降水δ18O与降水前后平均气温的相关性显著,分别高于δ18O与降水前气温或降水后气温的相关性.从空间上来看,山区或上游地区降水δ18O与气温之间的相关性显著,分别高于δ18O与山前或山前盆地的相关性.
The Heihe River, one of the long inland rivers in China, was confronted with water resources＇ scarceness owing to unreasonable development and utilization. To utilize effectively the limited water resources, isotope techniques was widely used to study hydrologic cycle. First of all, the characteristics of isotope in precipitation must be known. The relationships of δ^18O in precipitation with precipitation, altitude, season and temperature are respectively discussed based on the study at some precipitation sampling sites in the middle basin and mountain areas of the Heihe River. It is found that δ^18O depends on precipitation, altitude, season and temperature, and temperature is the most important factor. The dependence can be described by a multivariate linear regression equation. The fluctuation range of δ^18O is very wide from season to season, more than 20%0. There is a better linear relation between δ^18O in precipitation and temperature in mountain areas. The relationship between δ^18O in precipitation and average temperature is better than that between δ^18O in precipitation and the temperature before or after precipitation.
出处
《冰川冻土》
CSCD
北大核心
2007年第3期440-445,共6页
Journal of Glaciology and Geocryology
基金
国家自然科学基金项目(40572141)
国家科技基础条件平台项目(2004DEA70890)资助
