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Moisture sources and climate evolution during the last 30 kyr in northeastern Tibetan Plateau: Insights from groundwater isotopes (2H, 18O, 3H and 14C) and water vapour trajectories modeling
Quaternary Science Reviews ( IF 4 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.quascirev.2020.106426
Nuan Yang , Guangcai Wang

Abstract Understanding the past hydrological cycle and climate change may contribute to the sustainable utilization of water resources. Here we combined groundwater stable isotopes (2H and 18O), age dating (3H and 14C) and water vapour transport trajectories modeling to reveal the moisture source and climate evolution over the last 30 kyr in southeastern Qaidam Basin, northeast Tibetan Plateau. The compositions of δD and δ18O indicated that the groundwater was mainly recharged by precipitation and snowmelt water from the East Kunlun Mountains in the south. The groundwater stable isotopes exhibited a depleted trend from west to east across the four catchments of the basin which seemed not to alter since the late stage of the Late Pleistocene. A combination of the deuterium excess (d-excess) of groundwater and present-day moisture source modeling revealed that the moisture source had been dominated by the Westerlies without obvious impact of the summer monsoon since the last 30 kyr. The enriched δD and δ18O of groundwater during the Holocene suggested a warmer climate than the late stage of the Late Pleistocene, which seemed not to be accompanied by moisture source variations. The results of this study could be helpful for both climate change and water resource research in this region or even, over the entire Tibetan Plateau.

中文翻译:

青藏高原东北部最后 30 kyr 的水分来源和气候演变:来自地下水同位素(2H、18O、3H 和 14C)和水汽轨迹建模的见解

摘要 了解过去的水文循环和气候变化可能有助于水资源的可持续利用。在这里,我们结合地下水稳定同位素(2H 和 18O)、测年(3H 和 14C)和水汽输送轨迹模型,揭示了青藏高原东北部柴达木盆地东南部过去 30 kyr 的水分来源和气候演变。δD和δ18O的组成表明,地下水主要由南部东昆仑山的降水和融雪水补给。盆地四个流域的地下水稳定同位素呈现自西向东耗尽的趋势,自晚更新世晚期以来似乎没有改变。地下水的氘过量 (d-excess) 和当今水分源模型的结合表明,水分源一直以西风带为主,自过去 30 kyr 以来没有明显的夏季风影响。全新世时期地下水δD和δ18O的富集表明气候比晚更新世晚期更温暖,这似乎没有伴随着水分来源的变化。本研究结果对本地区乃至整个青藏高原的气候变化和水资源研究都有帮助。全新世时期地下水δD和δ18O的富集表明气候比晚更新世晚期更温暖,这似乎没有伴随着水分来源的变化。该研究结果对本地区乃至整个青藏高原的气候变化和水资源研究都有帮助。全新世时期地下水δD和δ18O的富集表明气候比晚更新世晚期更温暖,这似乎没有伴随着水分来源的变化。该研究结果对本地区乃至整个青藏高原的气候变化和水资源研究都有帮助。
更新日期:2020-08-01
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