中国西北塔里木盆地过去千年的水文波动

Geology Pub Date : 2024-02-14 DOI:10.1130/g51962.1
Kangkang Li, Xiaoguang Qin, G. Plunkett, David Brown, Bing Xu, Lei Zhang, Zhaoyan Gu, Guijin Mu, H. Jia, Zhiqiang Yin, Jiaqi Liu
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引用次数: 0

摘要

由于稀少的地质档案缺乏可靠的年代学约束,重建干旱地区的水文波动具有挑战性。本研究的目的是建立高时空分辨率的塔里木盆地(中国西北部)超干旱区水文变化的独立记录。塔里木河是中国最长的内流河,穿越世界第二大流动沙漠,我们通过对塔里木河古河道的地貌调查,获得了塔里木河亚化石植物遗存的全面放射性碳和树环数据集。研究结果表明,塔里木河流域中世纪晚期的格局具有水文连通性增强的特点,这表现在大约公元 1170 年沙漠地区形成了重要的河岸森林。西元 1170 年。首次确定了一个明显的低流量时期(约西元 1500-1650 年),完善了比现在更潮湿的特克斯和凯科斯群岛时期。目前 TR 下游的溪流组织是在干旱期之后初步形成的,可能是由偶发洪水引起的分流导致的。我们的研究描述了过去一千年中 TR 流量的百年尺度动态,为亚洲内陆广阔旱地的水文评估提供了可靠的长期背景。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Hydrological fluctuations in the Tarim Basin, northwest China, over the past millennium
Reconstruction of hydrological fluctuations in arid regions has proven challenging due to a lack of reliable chronologic constraints on sparse geological archives. The aim of this study was to establish an independent record of hydrologic changes in the hyper-arid Tarim Basin (TB; northwest China) with high spatiotemporal resolution. We present comprehensive radiocarbon and tree-ring data sets of subfossilized plant remains in the TB compiled from geomorphological investigations of the paleochannels of the Tarim River (TR), the longest endorheic river in China, crossing the world’s second-largest shifting sand desert. Results show that the late medieval configuration of the TR basin was characterized by enhanced hydrological connectivity, as indicated by the formation of significant riparian forests in the desert regions at ca. 1170 CE. A distinct low-flow interval (ca. 1500−1650 CE) is identified for the first time, refining the period of a wetter-than-present TB. The present-day organization of streams in the lower TR was proto-formed after the dry period, possibly led by episodic flood-induced diversion. Our study describes the centennial-scale dynamics in the TR flow over the past millennium, offering a robust long-term context for hydrological assessment in the extensive drylands of the Asian interior.
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