Stable Isotopes in Precipitation and Atmospheric Moisture of Pailugou Catchment in Northwestern China′s Qilian Mountains  

作　　者：FENG Fang FENG Qi LIU Xiande WU Jinkui LIU Wei 

机构地区：[1]School of Geography, Geomatics and Planning, Jiangsu Normal University, Xuzhou 221116, China [2]Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China [3]Institute of Water Resources Conservation Forests in Qilian Mountains, Zhangye 734000, China

出　　处：《Chinese Geographical Science》2017年第1期97-109,共13页中国地理科学（英文版）

基　　金：Under the auspices of National Natural Science Foundation of China(No.41501085,41461003);Postdoctoral Science Foundation of China(No.2013M532094)

摘　　要：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 δ^(18)O of precipitation in continuous event-based samples at three stations of Pailugou Catchment from November 2012 to December 2013. The δ^(18)O and δD values ranged from-32.32‰ to +3.23‰ and from-254.46‰ to +12.11‰, respectively. Results show that the δ^(18)O 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 δ^(18)O 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- 8δ^(18)O) parameter in precipitation exhibited an anti-phase seasonal variability with the δ^(18)O. 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.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 δ^18Oof precipitation in continuous event-based samples at three stations of Pailugou Catchment from November 2012 to December 2013. The δ^18Oand δD values ranged from-32.32‰ to ＋3.23‰ and from-254.46‰ to ＋12.11‰, respectively. Results show that the δ^18Odisplayed 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 δ^18Oand 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- 8δ^18O） parameter in precipitation exhibited an anti-phase seasonal variability with the δ^18O. 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.

关 键 词：meteoric precipitation δ^18O and δD d-excess moisture source Pailugou Catchment 

分 类 号：P426.612[天文地球—大气科学及气象学]