黑河流域中上游地区降水中氢氧同位素与温度关系研究

Relation between oxygen and hydrogen isotopes in precipitation and temperature in Heihe river basin,China

根据黑河流域中上游地区所取得的降水水样和降水气象资料,分析了该区域降水中氢氧同位素随温度的变化特征,研究了内陆河黑河流域中上游地区降水中氢氧同位素与温度的关系,揭示了降水中氢氧同位素随温度的变化规律。降水中氢氧同位素与温度有很好的正相关关系,且与降雨前后平均气温之间的相关性优于与降雨前和降雨后气温之间的,温度与δ^(18)O之间的相关性优于与δD的。在黑河流域,局地性降水的增加影响降水中氢氧同位素与温度之间的关系,在山前或山前盆地,因局地性降水增加,所以降水中氢氧同位素与温度的关系与山区相比较差。

Heihe River Basin, as one of the greatest inland rivers in China, was confronted with water resource scarceness due to unreasonable development and utilization. To utilize effectively the limited water resource, isotope techniques was widely used to research hydrologic cycle, first of all, characteristics of isotope in precipitation must be known. The relationship between oxygen and hydrogen isotopes in precipitation and temperature is discussed based on the study at some precipitation sampling sites in the middle basin and mountain areas of Heihe river basin. The positive correlation between δ^18O, δD and temperature was found and the better linear relation between temperature and δ^18O in precipitation reveals that δ^18O is a more reliable indicator of temperature than δD. The relationship between δ^18O in precipitation and average temperature is better than that between δ^18O and the temperature before or after precipitation. There is a better linear relation between δ^18O in precipitation and temperature at mountain areas with little local water atmosphere sources.