Shifting influences of Indian Ocean Dipole and western Pacific subtropical high on annual precipitation δ18O in southern East Asia
Clarifying relationships between stable oxygen isotope ratios in precipitation (δ18Op) and atmospheric circulations including the Indian Ocean Dipole (IOD) and western Pacific subtropical high (WPSH) forms the basis of paleocirculation reconstructions. However, whether the IOD and WPSH modulate interannual variations of δ18Op remains unclear. Here, we reveal the links between the IOD/WPSH and the annual δ18Op in southern East Asia. We found that the IOD strongly influenced annual δ18Op before 1999 by changes in moisture supply from different transport pathways and convection. However, the link became decoupled after 1999, resulting from the transition of the IOD from a symmetric to an asymmetric pattern. In contrast, significantly enhanced WPSH emerges as an important influence on annual δ18Op after 1999. Therefore, the IOD and WPSH alternately influence interannual variation of δ18Op around 1999. Our findings imply that signals of IOD and WPSH should be considered in different periods to better interpret paleoclimate records.
Authors
- Zhaowei Jing (ORCID: https://orcid.org/0000-0002-1049-4505)
- Rong Guo (ORCID: https://orcid.org/0000-0003-0332-2219)
- Stephen Lewis (ORCID: https://orcid.org/0000-0002-6929-6626)
- Lonnie G. Thompson (ORCID: https://orcid.org/0000-0001-5371-2579)
- Alexandre Cauquoin (ORCID: https://orcid.org/0000-0002-4620-4696)
- Wusheng Yu (ORCID: https://orcid.org/0000-0002-3089-0820)
- Pengjie Ren (ORCID: https://orcid.org/0000-0003-2964-6422)
- Dongmei Qu (ORCID: https://orcid.org/0000-0002-0389-2353)
- Zhuanxia Zhang
- Qiaoyi Wang (ORCID: https://orcid.org/0009-0007-7652-8644)
- Martin Werner (ORCID: https://orcid.org/0000-0002-6473-0243)
- Jingyi Zhang (ORCID: https://orcid.org/0000-0002-7048-0930)
- Baiqing Xu
- Guangjian Wu (ORCID: https://orcid.org/0000-0002-4095-7435)
- Yaoming Ma (ORCID: https://orcid.org/0000-0001-8387-8721)
Institutions
- Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung (DE)
- Chinese Academy of Sciences (CN)
- Beijing Forestry University (CN)
- Institute of Tibetan Plateau Research (CN)
- University of Chinese Academy of Sciences (CN)
- The Ohio State University (US)
- The University of Tokyo (JP)
- Henan Normal University (CN)
- Lanzhou University (CN)
- James Cook University (AU)
Publication Details
- Journal
- npj Climate and Atmospheric Science
- Published
- 2025-03-17
- DOI
- https://doi.org/10.1038/s41612-025-01000-4
- Citations
- 5
- Primary Topic
- Climate variability and models
- Type
- article
- Field-Weighted Citation Impact
- 5.53
Funders
- National Natural Science Foundation of China
- China Postdoctoral Science Foundation