摘要
大气降水是水循环中重要的输入因子,对其同位素组分的研究有助于深入了解水循环过程及其结构具有重要的意义。研究新疆乌鲁木齐地区1986-2002年大气降水的氢氧同位素组成,提出大气降水线方程,并与全国及全球降水线方程进行对比,揭示该降水线方程的特征。研究表明:乌鲁木齐水分来源复杂,主要是西风带输送的海洋水汽和局地的蒸发,大气降水的加权平均18O与月平均气温相关关系显著,与雨量效应(降水量效应)较相关,降水中温度效应明显,且在一定时期很大程度上其影响掩盖了雨量效应。乌鲁木齐降水中δ18O的季节变化与温度的季节变化几乎一致,温度是制约降水中稳定同位素变化的主要影响因子。
Precipitation is the most important input to water cycle. Study of hydrogen and oxygen isotopes of precipitation can help identify relationships between different water and climatic information of the study area, which is the foundation for integrated water cycle research. In this paper, hydrogen and oxygen isotopic compositions of the precipitation in the recent 17 years （from 1986-2002）in Urumqi area are studied,and the precipation line equation is brought forward. Comparison with the national and global equation is made to reveal the characters of this equation. According to researching,prepitation sources in Urumqi is complicated,mainly from oceanic vapor and local evaporation. δ18 O of precipitation （monthly means）and average precipation assume prominent correlation. The temperature amount effect of δD and δ^18O in the precipation is very pronounce, that concealed the temperature effect. There is notable temperature effect in Urumqi area. It has been observed that the seasonal variations of δ^18O in precipitation are almost consistent with its air temperature in Urumqi area, which shows that temperature is a main factor controlling the stable isotopic variations in precipitation.
出处
《水土保持研究》
CSCD
北大核心
2009年第5期157-161,共5页
Research of Soil and Water Conservation
基金
广西环境工程与保护评价重点实验室研究基金(桂科能0704K039)
广西师范大学青年基金
关键词
大气降水
δD
Δ^18O
温度效应
雨量效应
precipitation
δD
δ^18O
temperature effect
amount effect of precipation
