Abstract
Hydrogen and oxygen isotopes in precipitation have been widely used as effective traces to investigate hydrological processes such as evaporation and atmospheric moisture source. This study analyzed δD and δ18O of precipitation in continuous event-based samples at three stations of Pailugou Catchment from November 2012 to December 2013. The δ18O and δD values ranged from −32.32‰ to +3.23‰ and from −254.46‰ to +12.11‰, respectively. Results show that the δ18O displayed a distinct seasonal variation, with enriched values occurring in summer and relatively depleted values in winter, respectively. There was a statistically significant positive correlation between the δ18O and δD values and local surface air temperature at all the three stations. The nearest Global Network of Isotopes in Precipitation (GNIP) station (Zhangye), compared to the Meteoric Water Lines for this study, showed the obvious local evaporation effects with lower intercept and slope. Additionally, d-excess (δD − 8δ18O) parameter in precipitation exhibited an anti-phase seasonal variability with the δ18O. The 96-h back trajectories for each precipitation event using Hybrid Single Particle Lagrangian Integrated Trajectory (HYSPLIT) model indicated a dominant effect of westerly air masses in summer and the integrated influence of westerly and polar air masses in winter.
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