中文摘要：

基于黑河上游祁连山区2012年10月至2013年9月间次降水事件的δD、δ18^O数据,建立了当地大气降水线方程δD=8.29δ18^O＋17.13,并分析了各降水事件的氘盈余值特征,推断其水汽源区的气候条件相对干燥。结合HYSPLIT4气团轨迹模型计算结果,推断研究区降水全年主要受西风带水汽影响,春秋两季降水的水汽除了来自西风输送外,还混有局地和当地蒸散发水汽;夏季降水的水汽来源较为复杂,受到西风环流、内循环水汽以及少量东南亚季风水汽的综合作用;冬季的西风带水汽占有绝对优势。

英文摘要：

Based on the δD and ~δ18O data of all precipitation events from October 2012 to September 2013 in Qilian Mountain of Heihe river upstream, the Local Meteoric Water Line （LMWL） of δD=8.29δ18^O＋17.13 was established in the study area. Deuterium excess of precipitation was also calculated. The results showed that climate conditions should be relatively dry in the water vapor source region. With the aid of HYSPLIT4 air mass trajectory model, we suggested that the study area was mainly controlled by water vapor of westerlies throughout the year. In spring and autumn, local evapotranspiration also contributes significantly to the water vapor of precipitation. Water vapor of summer precipitation is also mainly from westerlies and recycled water, but occasionally from Southeast Asia monsoon.