Moisture sources and climate evolution during the last 30 kyr in northeastern Tibetan Plateau: Insights from groundwater isotopes (H-2, O-18, H-3 and C-14) and water vapour trajectories modeling
Moisture sources and climate evolution during the last 30 kyr in northeastern Tibetan Plateau: Insights from groundwater isotopes (H-2, O-18, H-3 and C-14) and water vapour trajectories modeling
复制标题
青藏高原东北部最近30 kyr的水分来源和气候演变：地下水同位素（H-2、O-18、H-3和C-14）和水汽轨迹模拟的见解
DOI：
10.1016/j.quascirev.2020.106426
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发表时间：
2020
影响因子：
4
通讯作者：
Wang Guangcai
中科院分区：
文献类型：
--
作者：
Yang Nuan;Wang Guangcai
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。本文结合地下水稳定同位素（2 H和18 O）、年龄测定（3 H和14 C）和水汽输送轨迹模拟，揭示了柴达木盆地东南部近30 kyr来的水汽来源和气候演变。δD和δ 18 O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。地下水稳定同位素在盆地四个流域均表现出自西向东的亏损趋势，且自晚更新世晚期以来基本保持不变。结合地下水的氘过量（d-过量）和现今的水汽来源模拟显示，水汽来源已占主导地位的西风带没有明显的影响，夏季风，因为过去30 kyr。全新世地下水δD和δ 18 O的富集表明气候较晚更新世晚期温暖，但未伴随水源的变化。研究结果对该地区乃至整个青藏高原的气候变化和水资源研究具有重要意义。
Understanding the past hydrological cycle and climate change may contribute to the sustainable utilization of water resources. Here we combined groundwater stable isotopes (2H and18O), age dating (3H and14C) 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.