Vol16 No.8: 1802-1815
【Title】Isotopic evidencefor the moisture origin and influencing factors at Urumqi Glacier No.1in upstream Urumqi River Basin, eastern Tianshan Mountains
【Author】SONG Meng-yuan1,2; LI Zhong-qin1*; XIA Dun-sheng3; JIN Shuang1; ZHANG Xin1,2
【Addresses】1 State Key Laboratory of Cryospheric Sciences/TianShan Glaciological Station, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China; 2 University of Chinese Academy of Sciences, Beijing 100049, China; 3 Key Laboratory of West China's Environmental System (Ministry of Education), Lanzhou University, Lanzhou 730000, China
【Corresponding author】LI Zhong-qin
【Citation】Song MY, Li ZQ, Xia DS,et al. (2019) Isotopic evidence for the moisture origin and influencing factors at Urumqi Glacier No.1 in upstream Urumqi River basin, eastern Tianshan Mountains. Journal of Mountain Science 16(8). https://doi.org/10.1007/s11629-018-5348-9
【Abstract】The stable isotope has been extensively applied as an effective tracer especially in precipitation. In glacierized area of arid northwest China, temperature is widely considered to be a major factor affecting isotopes in precipitation, while the influences of precipitation amount, relative humidity and other meteorological parameters are still not clear. Based on analyses on stable isotope values of water samples and NCEP/NCAR (National Centers of Environmental Prediction/National Center for Atmospheric Research, USA) re-analysis data, the moisture source and characteristics of isotopes in the precipitation, meltwater and river water isotopes at Urumqi Glacier No.1 of the upstream Urumqi River Basin, eastern Tianshan Mountains from spring to autumn during four years (from 2008 to 2011) was studied. Results indicated that meltwater are the main source of water for the upper Urumqi River. Seasonal variation of δ18O in precipitation demonstrated that δ18O was more enriched in summer and depleted in spring and autumn. Temperature was positively correlated with isotopes, while precipitation amount and relative humidity was negatively correlated with isotopes. The water vapor was affected by westerly air mass and regional water vapor cycle. Meanwhile, back trajectory clustering analyses showed that the moisture mainly from Europe and central Asia. The moisture was more likely to be locally sourced with the ratio was 46.8%~52.1%.
【Keywords】Stable hydrogen and oxygen isotope; Moisture origin; Precipitation; Urumqi River Basin; Northwestern China