During the last glacial termination, a warming trend was generally interrupted by rapid millennium-scale cold reversals, such as the Greenland (Isotope) Stadial 1 (GS-1) and GS-2a events. To understand how glaciers on the Tibetan Plateau (TP) responded to these rapid climate events, this study constrained the timing and extent of three glacial events during the late-glacial period. Specifically, using a cosmogenic 10Be exposure dating method, we dated three prominent glacial moraines (PM1, PM2, PM3) back to 15,850 ± 980, 14,140 ± 880, and 12,430 ± 790 yr in the Pagele valley, southern TP, corresponding to GS-2a, Greenland Interstadial 1 (GI-1), and GS-1, respectively. By simulating glacial extents forced by different climate scenarios, the study constrained the temperature decreases relative to present to be 2.6°C–2.9°C, ~1.6°C, and 1.4°C–1.5°C during the GS-2a, GI-1, and GS-1 periods in the region, with precipitation values of 60%–80%, ~100%, and 80%–90% of present value, respectively. Considering information from oceanic and atmospheric circulation, the study suggested that on the TP, the glacial events during the last glacial termination were well connected with the millennium-scale climate events in the North Atlantic region through the westerlies, while the Indian summer monsoon played a positive role in sustaining the glaciers under the warming climate trend.

中文翻译：

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青藏高原南部琼木岗日峰佩格勒河谷末次冰期末次冰川事件及其与海洋和大气环流的联系

在最后一次冰川终止期间，变暖趋势通常被千年规模的快速冷逆转所打断，例如格陵兰（同位素）Stadial 1（GS-1）和GS-2a事件。为了了解青藏高原 (TP) 上的冰川如何响应这些快速的气候事件，本研究限制了晚冰期三个冰川事件的时间和范围。具体来说，使用宇宙生成10采用暴露年代测定法，我们在 TP 南部 Pagele 山谷中将三个显着的冰川冰碛（PM1、PM2、PM3）的年代追溯到 15,850 ± 980、14,140 ± 880 和 12,430 ± 790 年，对应于 GS-2a, Greenland Interstadial 1 （GI-1）和GS-1，分别。通过模拟不同气候情景所迫使的冰川范围，该研究将 GS-2a、GI-期间相对于现在的温度下降限制为 2.6°C–2.9°C、~1.6°C 和 1.4°C–1.5°C 1、GS-1期，降水量分别为现值的60%~80%、~100%和80%~90%。考虑到来自海洋和大气环流的信息，研究表明，在青藏高原上，末次冰川终止期间的冰川事件与北大西洋地区通过西风带的千年气候事件有很好的联系，