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<p>Clarifying relationships between stable oxygen isotope ratios in precipitation (δ<sup>18</sup>O<sub>p</sub>) 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<sub>p</sub> remains unclear. Here, we reveal the links between the IOD/WPSH and the annual δ<sup>18</sup>O<sub>p</sub> in southern East Asia. We found that the IOD strongly influenced annual δ<sup>18</sup>O<sub>p</sub> 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<sub>p</sub> after 1999. Therefore, the IOD and WPSH alternately influence interannual variation of δ<sup>18</sup>O<sub>p</sub> around 1999. Our findings imply that signals of IOD and WPSH should be considered in different periods to better interpret paleoclimate records.</p>

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Shifting influences of Indian Ocean Dipole and western Pacific subtropical high on annual precipitation δ18O in southern East Asia

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年3月17日

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  • Jingyi Zhang,
  • Wusheng Yu,
  • Lonnie G. Thompson,
  • Stephen Lewis,
  • Alexandre Cauquoin,
  • Martin Werner,
  • Zhaowei Jing,
  • Yaoming Ma,
  • Baiqing Xu,
  • Guangjian Wu,
  • Rong Guo,
  • Pengjie Ren,
  • Zhuanxia Zhang,
  • Qiaoyi Wang,
  • Dongmei Qu

摘要

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.