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Monsoon-regulated marine carbon reservoir effect in the northern South China Sea

Published online by Cambridge University Press:  21 January 2025

Ling Yang
Affiliation:
State Key Laboratory of Loess, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an, 710061, China Shaanxi Key Laboratory of Accelerator Mass Spectrometry Technology and Application, Xi’an AMS Center of IEECAS, 710061, China University of Chinese Academy of Sciences, Beijing, 100049, China
Weijian Zhou*
Affiliation:
State Key Laboratory of Loess, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an, 710061, China Shaanxi Key Laboratory of Accelerator Mass Spectrometry Technology and Application, Xi’an AMS Center of IEECAS, 710061, China Laoshan Laboratory, Qingdao, 266237, China
Peng Cheng
Affiliation:
State Key Laboratory of Loess, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an, 710061, China Shaanxi Key Laboratory of Accelerator Mass Spectrometry Technology and Application, Xi’an AMS Center of IEECAS, 710061, China
Luyuan Zhang
Affiliation:
State Key Laboratory of Loess, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an, 710061, China Shaanxi Key Laboratory of Accelerator Mass Spectrometry Technology and Application, Xi’an AMS Center of IEECAS, 710061, China
Gangjian Wei
Affiliation:
State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China
Xiaolin Ma
Affiliation:
State Key Laboratory of Loess, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an, 710061, China
Jie Zhou
Affiliation:
Xi’an institute for innovative Earth Environment Research, Xi’an 710061, China
Hong Yan
Affiliation:
State Key Laboratory of Loess, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an, 710061, China Laoshan Laboratory, Qingdao, 266237, China
Ning Chen
Affiliation:
State Key Laboratory of Loess, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an, 710061, China Shaanxi Key Laboratory of Accelerator Mass Spectrometry Technology and Application, Xi’an AMS Center of IEECAS, 710061, China
Yaoyao Hou
Affiliation:
State Key Laboratory of Loess, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an, 710061, China Shaanxi Key Laboratory of Accelerator Mass Spectrometry Technology and Application, Xi’an AMS Center of IEECAS, 710061, China
*
Corresponding author: Weijian Zhou; Email: [email protected]

Abstract

The ubiquitous marine radiocarbon reservoir effect (MRE) constrains the construction of reliable chronologies for marine sediments and the further comparison of paleoclimate records. Different reference values were suggested from various archives. However, it remains unclear how climate and MREs interact. Here we studied two pre-bomb corals from the Hainan Island and Xisha Island in the northern South China Sea (SCS), to examine the relationship between MRE and regional climate change. We find that the MRE from east of Hainan Island is mainly modulated by the Southern Asian Summer Monsoon-induced precipitation (with 11.4% contributed to seawater), rather than wind induced upwelling. In contrast, in the relatively open seawater of Xisha Island, the MRE is dominated by the East Asian Winter Monsoon, with relatively more negative (lower) ΔR values associated with high wind speeds, implying horizontal transport of seawater. The average SCS ΔR value relative to the Marine20 curve is –161±39 14C years. Our finding highlights the essential role of monsoon in regulating the MRE in the northern SCS, in particularly the tight bond between east Asian winter monsoon and regional MRE.

Type
Research Article
Copyright
© The Author(s), 2025. Published by Cambridge University Press on behalf of University of Arizona

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