Shifting influences of Indian Ocean Dipole and western Pacific subtropical high on annual precipitation δ18O in southern East Asia
Zhang, Jingyi, Yu, Wusheng, Thompson, Lonnie G., Lewis, Stephen, Cauquoin, Alexandre, Werner, Martin, Jing, Zhaowei, Ma, Yaoming, Xu, Baiqing, Wu, Guangjian, Guo, Rong, Ren, Pengjie, Zhang, Zhuanxia, Wang, Qiaoyi, and Qu, Dongmei (2025) Shifting influences of Indian Ocean Dipole and western Pacific subtropical high on annual precipitation δ18O in southern East Asia. Npj Climate and Atmospheric Science, 8 (1). 107.
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Abstract
Clarifying relationships between stable oxygen isotope ratios in precipitation (δ<sup>18</sup>O<inf>p</inf>) 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 δ<sup>18</sup>O<inf>p</inf> remains unclear. Here, we reveal the links between the IOD/WPSH and the annual δ<sup>18</sup>O<inf>p</inf> in southern East Asia. We found that the IOD strongly influenced annual δ<sup>18</sup>O<inf>p</inf> 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 δ<sup>18</sup>O<inf>p</inf> after 1999. Therefore, the IOD and WPSH alternately influence interannual variation of δ<sup>18</sup>O<inf>p</inf> around 1999. Our findings imply that signals of IOD and WPSH should be considered in different periods to better interpret paleoclimate records.
| Item ID: | 87750 |
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| Item Type: | Article (Research - C1) |
| ISSN: | 2397-3722 |
| Copyright Information: | ©TheAuthor(s) 2025. This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License, which permits any non-commercial use, sharing, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if you modified the licensed material. You do not have permission under this licence to share adapted material derived from this article or parts of it. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. |
| Date Deposited: | 12 Feb 2026 05:38 |
| FoR Codes: | 37 EARTH SCIENCES > 3701 Atmospheric sciences > 370105 Atmospheric dynamics @ 100% |
| SEO Codes: | 18 ENVIRONMENTAL MANAGEMENT > 1801 Air quality, atmosphere and weather > 180103 Atmospheric processes and dynamics @ 100% |
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