The prolonged weak monsoon event in East Asia and the interhemispheric seesaw: implications for persistent AMOC forcing at the mid-late Holocene transition

IF 4 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Global and Planetary Change Pub Date : 2025-09-24 DOI:10.1016/j.gloplacha.2025.105091

Maoxia Li , Weihong Zhang , Shitao Chen , Jianshun Chen , Yifei Wang , Qingfeng Shao , Yongjin Wang

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Abstract

The interhemispheric seesaw at lower latitudes is well established from the last glaciation to the early Holocene. This phenomenon is driven by variations in the Atlantic Meridional Overturning Circulation (AMOC) and the associated latitudinal migration of the Intertropical Convergence Zone (ITCZ). However, the persistence of this phenomenon and the mechanisms involved during the late Holocene, a period characterized by minimal and stable global ice volume, remain unclear. This study presents a new 5.3-year-resolution stalagmite δ¹⁸O record from central China spanning 4.4–3.0 ka BP. Our data reveal a multi-centennial weak Asian summer monsoon (ASM) event spanning 4.4–3.5 ka BP that is inversely correlated with intensified South American summer monsoon (SASM) activity. This antiphase relationship mirrors the pattern observed during the Little Ice Age (LIA), suggesting a consistent seesaw mechanism. Further analysis shows that an AMOC slowdown coupled with a southward shift in the ITCZ created this hemispheric antiphase during both events. El Niño-like conditions further strengthened the ASM–SASM antiphase relationship during both the 4.4–3.5 ka event and the LIA. Unlike the typical AMOC–solar correlation observed during the LIA, the weakened AMOC during the 4.4–3.5 ka event coincided with strong solar activity. Our results emphasize the persistent seesaw pattern during the mid-to-late Holocene transition, which is driven by changes in the AMOC and El Niño-Southern Oscillation (ENSO) rather than solar activity.

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东亚持续的弱季风事件和半球间的跷跷板：对全新世中晚期过渡时期持续的AMOC强迫的影响

从末次冰期到全新世早期，低纬度地区的半球间跷跷板已经很好地建立起来。这种现象是由大西洋经向翻转环流（AMOC）的变化和与之相关的热带辐合带（ITCZ）的纬向迁移驱动的。然而，在全球冰量最小且稳定的全新世晚期，这种现象的持续存在及其机制尚不清楚。本文提出了一个新的5.3年分辨率的华北石笋δ18O记录，时间跨度为4.4 ~ 3.0 ka BP。我们的数据揭示了一个跨越4.4-3.5 ka BP的百年弱亚洲夏季风（ASM）事件，该事件与南美洲夏季风（SASM）活动增强呈负相关。这种反相位关系反映了在小冰期（LIA）观察到的模式，表明了一个一致的跷跷板机制。进一步的分析表明，在这两次事件中，AMOC的减速加上ITCZ的南移造成了这种半球反相。在4.4-3.5 ka事件和LIA期间，El Niño-like条件进一步强化了ASM-SASM反相关系。与LIA期间观测到的典型AMOC -太阳相关不同，4.4-3.5 ka事件期间AMOC减弱与太阳活动强烈相吻合。我们的研究结果强调了全新世中晚期转变过程中持续的跷跷板模式，这种模式是由AMOC和El Niño-Southern涛动（ENSO）的变化而不是太阳活动驱动的。

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

Global and Planetary Change 地学天文-地球科学综合

CiteScore

7.40

自引率

10.30%

发文量

226

审稿时长

63 days

期刊介绍： The objective of the journal Global and Planetary Change is to provide a multi-disciplinary overview of the processes taking place in the Earth System and involved in planetary change over time. The journal focuses on records of the past and current state of the earth system, and future scenarios , and their link to global environmental change. Regional or process-oriented studies are welcome if they discuss global implications. Topics include, but are not limited to, changes in the dynamics and composition of the atmosphere, oceans and cryosphere, as well as climate change, sea level variation, observations/modelling of Earth processes from deep to (near-)surface and their coupling, global ecology, biogeography and the resilience/thresholds in ecosystems. Key criteria for the consideration of manuscripts are (a) the relevance for the global scientific community and/or (b) the wider implications for global scale problems, preferably combined with (c) having a significance beyond a single discipline. A clear focus on key processes associated with planetary scale change is strongly encouraged. Manuscripts can be submitted as either research contributions or as a review article. Every effort should be made towards the presentation of research outcomes in an understandable way for a broad readership.