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<p>Knowledge of Holocene hydroclimate change is critical to better understand the potential impact of future global climate change on water resources and water-related disaster risks on the Tibetan Plateau (TP). Here, we present a high-resolution biogeochemical record from a 20.47&#xa0;m core from Lake Basongcuo, which was used to infer past hydroclimate fluctuations and related lake evolution changes over the last ~ 7.0&#xa0;cal kyr. Scanned X-ray fluorescence (XRF) and total organic carbon (TOC) data suggest that the interval ~ 7.00 to 6.05&#xa0;cal&#xa0;ka BP was marked by warm and wet conditions. The following period, ~ 6.05 to 3.80&#xa0;cal&#xa0;ka BP, was characterized by lake deepening under moderately warm and wet conditions. Rapid changes in multiple climate proxy variables ca. 3.8&#xa0;cal&#xa0;ka BP indicated the termination of the warm/wet period at the onset of the Late Holocene. A cooling and drying trend occurred after 3.8&#xa0;cal&#xa0;ka BP and persisted until an increase in temperature and precipitation began about 0.1&#xa0;cal&#xa0;ka BP. The Basongcuo record displays similarities to other paleoclimate records from the southern and central TP, suggesting coherent millennial-scale hydroclimate changes across the region that were controlled mainly by the variations in the intensity of the Indian Summer Monsoon and the position of the Intertropical Convergence Zone. Eight glacier advance events were identified at 6.4, 5.3, 4.9, 2.7, 2.4, 0.7, 0.3 and 0.11&#xa0;cal&#xa0;ka BP. Those events closely tracked declines in total solar irradiance, indicating the strong influence of solar activity on centennial-scale climate and environmental fluctuations.</p> Graphical abstract <p></p>

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Holocene hydroclimatic changes inferred from a mountainous lake sedimentary record on the southeastern Tibetan Plateau

  • 期刊论文

  • 发表日期：

    2025年6月4日

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  • Jianchao Zhou,
  • Jinglu Wu,
  • Ru Guo,
  • Ming Ji

摘要

Knowledge of Holocene hydroclimate change is critical to better understand the potential impact of future global climate change on water resources and water-related disaster risks on the Tibetan Plateau (TP). Here, we present a high-resolution biogeochemical record from a 20.47 m core from Lake Basongcuo, which was used to infer past hydroclimate fluctuations and related lake evolution changes over the last ~ 7.0 cal kyr. Scanned X-ray fluorescence (XRF) and total organic carbon (TOC) data suggest that the interval ~ 7.00 to 6.05 cal ka BP was marked by warm and wet conditions. The following period, ~ 6.05 to 3.80 cal ka BP, was characterized by lake deepening under moderately warm and wet conditions. Rapid changes in multiple climate proxy variables ca. 3.8 cal ka BP indicated the termination of the warm/wet period at the onset of the Late Holocene. A cooling and drying trend occurred after 3.8 cal ka BP and persisted until an increase in temperature and precipitation began about 0.1 cal ka BP. The Basongcuo record displays similarities to other paleoclimate records from the southern and central TP, suggesting coherent millennial-scale hydroclimate changes across the region that were controlled mainly by the variations in the intensity of the Indian Summer Monsoon and the position of the Intertropical Convergence Zone. Eight glacier advance events were identified at 6.4, 5.3, 4.9, 2.7, 2.4, 0.7, 0.3 and 0.11 cal ka BP. Those events closely tracked declines in total solar irradiance, indicating the strong influence of solar activity on centennial-scale climate and environmental fluctuations.

Graphical abstract