Resonant Asian Monsoon During Intermediate Conditions of the Last Deglaciation: Insights From Speleothem Records
Abstract Extensive research has explored how sweet spot conditions influence climate variability in the nonlinear Earth system. However, their effects throughout deglaciations remain unclear. Based on an annual‐laminated speleothem δ 18 O record with unprecedented chronology precision, we first identified a two‐step termination of the Asian Heinrich Period‐1 at 15.11 and 14.69 ky BP (thousand years before present, where the present is 1950 CE), each marked by a centennial‐scale strengthening of the Asian summer monsoon (ASM), in contrast to centennial‐scale ASM weakening events observed at 17.8 and 16.09 ky BP. These transitions occurred under intermediate CO 2 and ice volume conditions, which dynamically paced the Atlantic Meridional Overturning Circulation (AMOC) fluctuations and the subsequent reoccurrence of ASM events. It highlights the role of stochastic resonance in nonlinear climate system. Additionally, these AMOC/ASM events also resonated with abrupt CO 2 risings across various pervasive modes of variability, which account for half of total CO 2 rise during last deglaciation. This substantial contribution to CO 2 increases played a key role in ice termination.
Authors
- Xiyu Dong (ORCID: https://orcid.org/0000-0002-7611-0244)
- Jun Cheng (ORCID: https://orcid.org/0000-0003-0168-1410)
- Yassine Ait Brahim (ORCID: https://orcid.org/0000-0003-3098-7339)
- Jingyao Zhao (ORCID: https://orcid.org/0000-0002-4252-6540)
- Carlos Pérez‐Mejías (ORCID: https://orcid.org/0000-0002-8370-9271)
- Liangcheng Tan (ORCID: https://orcid.org/0000-0003-1932-7102)
- Xi Chen (ORCID: https://orcid.org/0009-0002-7713-1220)
- Kexin Wang (ORCID: https://orcid.org/0000-0003-1453-6976)
- Haiwei Zhang (ORCID: https://orcid.org/0000-0002-0855-1283)
- Yan Yang (ORCID: https://orcid.org/0000-0003-2289-0182)
- Liangkang Pan
- Jiahui Cui
- Hai Cheng
Institutions
- Southwest University (CN)
- Chinese Academy of Sciences (CN)
- Nanjing University of Information Science and Technology (CN)
- Université Mohammed VI Polytechnique (MA)
- Institute of Earth Environment (CN)
- Xi'an Jiaotong University (CN)
Publication Details
- Journal
- Journal of Geophysical Research Atmospheres
- Published
- 2025-04-23
- DOI
- https://doi.org/10.1029/2024jd042523
- Citations
- 1
- Primary Topic
- Geology and Paleoclimatology Research
- Type
- article
- Field-Weighted Citation Impact
- 1.30
Funders
- National Natural Science Foundation of China
- Chinese Academy of Sciences
- China Postdoctoral Science Foundation
- Nantong University
- State Key Laboratory for Manufacturing Systems Engineering
- China University of Geosciences
- California State University, Dominguez Hills