摘要
利用稳定同位素物质平衡方法可以估算湖泊的蒸发。该方法的主要特点是不必测定入湖水量，只须测定其稳定同位素比率。文章根据青海湖实测的氧同位素比率资料和有关水文气象资料，并利用稳定同位素模型计算得出，青海湖多年平均蒸发量为８７７ｍｍ。这个值与同一时期９０４．６ｍｍ的实测蒸发量大致相当。不同水体中稳定同位素比率的大小对湖泊蒸发量有不同程度的影响。其中降水和入湖水中的稳定同位素比率与蒸发量存在正比关系；湖泊水和蒸发水中的稳定同位素比率与蒸发量存在反比关系。计算结果还表明，青海湖区温度升高时，蒸发量增加；
According to the measured stable isotopic ratio data and relevant hydrometeorological data, the mean annual evaporation, 877 mm, in the Qinghai Lake was calculated by a stable isotopic model The calculated value is basically equivalent to 904 6 mm, measured evaporation during the same period The simulations show that stable isotopic ratios in different natural waters have different impact on lake evaporation, i e , the stable isotopic ratio in precipitaiton and inflows is in proportion to evaporation, and that in lake water or evaporated water is in inverse proportion to evaporation In addition, evaporation increases with temperature over the lake; the increasing range of evaporation is in proportion to that of precipitation
出处
《冰川冻土》
CSCD
北大核心
1997年第2期161-166,共6页
Journal of Glaciology and Geocryology
基金
国家自然科学基金
关键词
稳定同位素
比率估计
湖泊
蒸发
evaporation, stable isotopic ratio, Qinghai Lake, temperature, precipitation
