Solar activity and air-sea interactions in the North Atlantic drive multidecadal to centennial-scale hydroclimate variability in arid Central Asia during the Mid-Late Holocene

IF 2.7 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology Pub Date : 2025-10-08 DOI:10.1016/j.palaeo.2025.113327

Xiang Mi , Fangyuan Lin , Ashish Sinha , Dianbing Liu , Huiru Tang , Lvfan Chen , Xu Lin , Qiong Zhang , Rustam Orozbaev , Liangcheng Tan

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引用次数: 0

Abstract

Understanding multidecadal to centennial-scale climate variability in arid Central Asia remains challenging due to limitations in the age control, resolution, and duration of available proxy records. In this study, we analyzed a continuous, and precisely dated (∼6 ‰ precision) stalagmite δ¹⁸O record with high temporal resolution (∼4 years) that spans the mid- to late Holocene from Talisman cave in the Fergana Valley, Kyrgyzstan, in arid Central Asia (ACA). This record reveals significant climate variability at both multidecadal and centennial timescales. Spectral analysis suggests that these fluctuations may be linked to solar forcing and the North Atlantic Oscillation (NAO). Drier conditions appear to coincide with a northward shift of the Westerlies, which in turn may be driven by reduced solar activity and positive phases of the NAO. Notably, multidecadal δ¹⁸O fluctuations, coincided with the NGRIP δ¹⁸O record and the Atlantic Meridional Overturning Circulation (AMOC) index, slightly weakened during major ice-rafted debris (IRD) events—likely due to freshwater forcing and internal atmospheric variability.

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全新世中后期，太阳活动和北大西洋海气相互作用驱动中亚干旱地区多年代际至百年尺度的水文气候变率

由于代用记录的年龄控制、分辨率和持续时间的限制，了解中亚干旱地区多年代用至百年尺度的气候变率仍然具有挑战性。在这项研究中，我们分析了一个连续的、精确测年（~ 6‰精度）、高时间分辨率（~ 4年）的石笋δ18O记录，该记录跨越了全新世中晚期，位于干旱的中亚（ACA）吉尔吉斯斯坦费尔干纳山谷的Talisman洞穴。这一记录揭示了在多年代际和百年时间尺度上的显著气候变化。光谱分析表明，这些波动可能与太阳强迫和北大西洋涛动（NAO）有关。更干燥的条件似乎与西风带向北移动相一致，而西风带向北移动又可能是由太阳活动减少和NAO正相位驱动的。值得注意的是，与NGRIP δ18O记录和大西洋经向翻转环流（AMOC）指数一致的多年代际δ18O波动，在主要的冰筏碎片（IRD）事件期间略有减弱，可能是由于淡水强迫和大气内部变率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Palaeogeography, Palaeoclimatology, Palaeoecology 地学-地球科学综合

CiteScore

5.90

自引率

10.00%

发文量

398

审稿时长

3.8 months

期刊介绍： Palaeogeography, Palaeoclimatology, Palaeoecology is an international medium for the publication of high quality and multidisciplinary, original studies and comprehensive reviews in the field of palaeo-environmental geology. The journal aims at bringing together data with global implications from research in the many different disciplines involved in palaeo-environmental investigations. By cutting across the boundaries of established sciences, it provides an interdisciplinary forum where issues of general interest can be discussed.