青藏高原东南部海子山末次冰盛期到末次冰消期冰川【封面文章】事件及其气候驱动机制研究

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Abstract：Background，aim，andscope The Haizishan （HZS）area，located in the hinterland of the Hengduan Mountains on the southeastern Qinghai-Xizang Plateau （QXP）， preserves abundant wel-preserved glacial landforms from Quaternary glaciations，offering valuable records of past climate. However， the lack of highprecision chronological constraints has hindered a comprehensive understanding of glacial dynamics from the Last Glacial Maximum （LGM） to the Last Glacial Termination （T1）.This study aims to reconstruct the spatiotemporal pattern of glacier fluctuations in HZSand to clarify the dominant climatic factors responsible for these changes from the LGM to T1. Materials and methods We applied 10Be surface exposure dating to two moraines located in the Yangying Co Valley，at the southern margin of the HZS.Results The moraines yielded exposure ages of （21.0±0.6） ka and （17.3±0.6） ka （mean age）. Discussion These results indicate two distinct phases of glacial events，corresponding to the LGM and T1， respectively. Combined with recalculated regional 10Be ages， four glacial events were identified in HZS during this period， occurring around （21.0±1.4） ）ka （LGM; onset of glacier retreat）， （19.0±0.4） ）ka（the end ofLGM; standstill or readvance）， （ 16.9±0.9 ）ka（Heinrich Stadial1;standstill or readvance）， and （14.7±0.7） ）ka （Bolling-Allerod Interstadial; rapid deglaciation）. These four glacier events reveal an evolutionary process of stepwise glacial retreat and final deglaciation. Comparison with multiple climate proxies indicates that regional summer temperature was the primary driver.These temperature changes closely track sea surface temperature （SST） variations in the Indo-Pacific Warm Pool （IPWP）. Conclusions This study provides a robust glacial chronology for the HZS and reveals four major glacier events from the LGM to T1.The findings highlight the high sensitivityof glaciers in the southeastern QXP to regional summer temperature， which is linked to the SST in the IPWP. Recommendations and perspectives Reconstructing glacial histories is crucial for understanding Quaternary glaciation across the QXP.However，due to the region’s vastness，many areas remain undated.Therefore，further chronological investigations across more glaciated sectors of the QXP are essential.

Key words： 10Be surface exposure dating; Last Glacial Maximum; glacial event; Haizishan area; the southeastern Qinghai-Xizang Plateau

山地冰川作为气候变化的灵敏指示器（施雅风，2000），是古气候环境重建极为重要的研究对象之一。（剩余24936字）