From Desiccation to Re‐Integration of the Yellow River Since the Last Glaciation
From Desiccation to Re‐Integration of the Yellow River Since the Last Glaciation
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DOI：
10.1029/2023gl103632
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发表时间：
2023-08
影响因子：
5.2
通讯作者：
Yuqi Zhao;Niannian Fan;J. Nie;J. Abell;Yu An;Zhangdong Jin;Chengshan Wang;Jia-Fu Zhang;Xing-nian Liu;Ruihua Nie
中科院分区：
文献类型：
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作者：
Yuqi Zhao;Niannian Fan;J. Nie;J. Abell;Yu An;Zhangdong Jin;Chengshan Wang;Jia-Fu Zhang;Xing-nian Liu;Ruihua Nie
河流的干燥（极端干燥）对更广泛的地球系统具有重要意义。然而，干燥的历史及其与气候的联系很少为许多主要河流系统所知，主要是由于从现有的地层记录中识别干燥事件的困难。在这里，使用地球化学技术（主元素和稀土元素地球化学，碎屑锆石年代学和光释光测年）的组合，我们证明了黄河，保持了地球上最高的沉积物负荷，在大约2万年前的末次盛冰期变得干燥。这一发现意味着，通过黄河向海洋输送沉积物和溶解成分可能在冰川期间大幅减少或停止，这将对海洋化学和生物学产生影响。此外，我们的工作强调了干燥的河床沉积物作为冰川时期潜在灰尘来源的重要性，这一发现与今天观察到的不同。
The desiccation (extreme drying) of rivers has important implications for the broader Earth System. However, the desiccation history and its linkage to climate are rarely known for numerous major river systems, primarily due to difficulties in recognizing desiccation events from available stratigraphic records. Here, using a combination of geochemical techniques (major and rare‐earth element geochemistry, detrital zircon geochronology, and optically stimulated luminescence dating), we demonstrate that the Yellow River, which maintains the highest sediment load on Earth, became desiccated during the Last Glacial Maximum at approximately 20 thousand years ago. This finding implies that transportation of sediments and dissolved constituents to the oceans via the Yellow River may have decreased substantially or ceased during glacials, which would have ramifications for ocean chemistry and biology. Furthermore, our work highlights the importance of desiccated riverbed sediments as potential dust sources during glacial periods, a finding that is different from what is observed today.