近日，南京师范大学赵侃团队研究了玉泉洞多代石笋记录的早全新世季风突变及其水文响应。这一研究成果于2026年3月10日发表在《中国科学：地球科学》杂志上。

8.2 ka和9.2 ka事件是早全新世两个显著的突发气候事件，然而在这两次事件期间东亚夏季风的变化特征及其驱动机制尚不明确。

研究组基于中国中部河南禹泉洞穴石笋YQ18的多指标记录（δ¹⁸O、δ¹³C、Mg/Ca和δ²³⁴U），重建了早全新世高分辨率的水文气候变化序列。研究结果显示，在8.2 ka和9.2 ka事件期间，东亚夏季风减弱和区域干旱同时发生，表明研究区的干湿变化主要受控于夏季风强度波动。YQ18记录揭示，8.2 ka弱季风事件发生于约8.38~8.06 ka B.P.，持续约320年，呈现"双谷"结构特征；9.2 ka事件发生于约9.33~9.06 ka B.P.，持续约270年，表现为"单谷"结构特征。

其中8.2 ka事件期间的季风衰退程度（δ¹⁸O变幅~0.88‰，δ¹³C变幅~1.42‰）较9.2 ka事件（δ¹⁸O变幅~0.44‰，δ¹³C变幅~1.18‰）更为显著。通过与高纬度气候记录对比，研究组支持北大西洋淡水注入通过减弱大西洋经向翻转流，改变南北半球温度梯度驱动热带辐合带南移，进而导致东亚夏季风减弱的机制。其中两次淡水注入事件共同塑造了8.2 ka事件的"双谷"结构，而大规模淡水注入叠加火山活动可能进一步加剧并延长了此次事件。研究组揭示了东亚夏季风对外部强迫和气候系统内部变率的敏感响应，为理解当代人为影响下的季风异常提供了重要参照。

附：英文原文

Title: Early Holocene monsoon abrupt changes and hydrological response as recorded by a multi-proxy stalagmite from Yuquan Cave, Central China

Author: Xiaomeng CUI, Junji ZHU, Kan ZHAO, Jiangying WU, Yijia LIANG, Liang NING, Qingfeng SHAO, Yongjin WANG

Issue&Volume: 2026/03/10

Abstract: The 8.2ka B.P. event and 9.2ka B.P. event are prominent abrupt climate events in the Early Holocene. However, the characteristics and mechanisms of the East Asian summer monsoon (EASM) during the two events remain unclear. This study provides precisely-dated and high-resolution hydroclimate reconstructions during the early Holocene from stalagmite (YQ18) multi-proxy records (δ18O, δ13C, Mg/Ca, and δ234U) in Yuquan Cave, Central China. The observed EASM weakening and regional drought during the 8.2ka B.P. and 9.2ka B.P. events indicate that the dry and wet conditions in the study area are mainly controlled by changes in the EASM intensity. The YQ18 records show that the 8.2ka B.P. weak monsoon event occurred from ~8.38–8.06ka B.P, lasting for about 320years, with a double valley structure. The 9.2ka B.P. event occurred in about 9.33–9.06ka B.P. and lasted for about 270years, characterized by a single valley structure. The monsoon declining and regional drying during the 8.2ka B.P. event (with an amplitude of ~0.88‰ in δ18O and ~1.42‰ in δ13C) are more severe than those during the 9.2ka B.P. events (with an amplitude of ~0.44‰ in δ18O and ~1.18‰ in δ13C). The comparison between the YQ18 records and the climate records in the northern high latitudes supports the view that the freshwater injections in the North Atlantic weakened the Atlantic Meridional Overturning Circulation, resulting in southward shifts in the Intertropical Convergence Zone by changing the interhemispheric temperature gradient and weakening the EASM. The two freshwater injections in the North Atlantic play an important role in the double valley structure of the 8.2ka B.P. event. Meanwhile, the large-scale freshwater injection and volcanic eruptions likely strengthened and prolonged the 8.2ka B.P. event. Therefore, this study highlights the sensitive response of the EASM to external forcing and internal climate variability, providing important references for understanding monsoon anomalies under contemporary anthropogenic influences.

DOI: 10.1007/s11430-025-1817-1

Source: https://www.sciengine.com/SCES/doi/10.1007/s11430-025-1817-1