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Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/hess-2016-692
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
16 Feb 2017
Review status
A revision of this discussion paper is under review for the journal Hydrology and Earth System Sciences (HESS).
Water resources in the Badain Jaran Desert, China: New insight from isotopes
Xiujie Wu1,2,3, Xu-Sheng Wang1, Yang Wang2,3,4, and Bill X. Hu1,2,4 1School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing, 100083, P. R. China
2Department of Earth, Ocean, and Atmospheric Science, Florida State University, Tallahassee, FL, 32304, USA
3High National Magnetic Field Laboratory, Tallahassee, FL, 32310, USA
4Institute of Groundwater and Earth Sciences, The Jinan University, Guangzhou, Guangdong Province, 510632, P. R. China
Abstract. To better understand the origin of water in the Badain Jaran Desert, China, water samples were collected from lakes, a spring and local unconfined aquifer for analyses of radiocarbon (14C) and tritium (3H), stable hydrogen and oxygen isotope ratios (δ2H, δ18O), and d-excess values (= δ2H – 8δ18O). A series of evaporation experiments were also conducted in the desert to examine how the isotopic signature of water may change during evaporation and infiltration under local environmental conditions. The results show that the lakes in the southeastern sand dune area are fed by groundwater discharging into the lakes and that local groundwater, on the other hand, is derived primarily from modern meteoric precipitation in the region. Although dissolved inorganic carbon (DIC) in groundwater yielded very old radiocarbon ages, the presence of detectable amounts of tritium in groundwater samples, together with their δ2H, δ18O and d-excess characteristics, strongly suggest that the old radiocarbon ages of DIC do not represent the residence time of water in the aquifer but are the result of addition of old DIC derived from dissolution of ancient carbonates in the aquifer. The data do not support the hypothesis that the water in the Badain Jaran Desert was sourced in remote mountains on the northern Tibetan Plateau. This study also finds no support for the hypothesis that present-day water resources in the desert were recharged by the precipitation that fell in the past during the early Holocene when the climate was much wetter than today. Instead, this study shows that both groundwater and lake water were originated from meteoric precipitation in the region including mountainous areas adjacent to the desert under the modern climatic condition.

Citation: Wu, X., Wang, X.-S., Wang, Y., and Hu, B. X.: Water resources in the Badain Jaran Desert, China: New insight from isotopes, Hydrol. Earth Syst. Sci. Discuss., https://doi.org/10.5194/hess-2016-692, in review, 2017.
Xiujie Wu et al.
Xiujie Wu et al.
Xiujie Wu et al.

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Short summary
It is critical to identify the origins of water in arid and semi-arid regions for management and protection of the water resources. D, 18O, 3H and 14C in water samples from the Badain Jaran Desert, China, were analyzed. The results show that groundwater supplies the lakes and groundwater is originated from local precipitation and adjacent mountains. Negative d-excess values of water in the area were the result of evaporation. The 14C ages do not represent the residence time of local groundwater.
It is critical to identify the origins of water in arid and semi-arid regions for management and...
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