Indian Ocean glacial deoxygenation and respired carbon accumulation during mid-late Quaternary ice ages

Chang, Liao; Hoogakker, Babette A.A.; Heslop, David; Zhao, Xiang; Roberts, Andrew P.; De Deckker, Patrick; Xue, Pengfei; Pei, Zhaowen; Zeng, Fan; Huang, Rong; Huang, Baoqi; Wang, Shishun; Berndt, Thomas A.; Leng, Melanie; Stuut, Jan Berend W.; Harrison, Richard J.

Abstract

Reconstructions of ocean oxygenation are critical for understanding the role of respired carbon storage in regulating atmospheric CO2. Independent sediment redox proxies are essential to assess such reconstructions. Here, we present a long magnetofossil record from the eastern Indian Ocean in which we observe coeval magnetic hardening and enrichment of larger, more elongated, and less oxidized magnetofossils during glacials compared to interglacials over the last ~900 ka. Our multi-proxy records of redox-sensitive magnetofossils, trace element concentrations, and benthic foraminiferal Δδ13C consistently suggest a recurrence of lower O2 in the glacial Indian Ocean over the last 21 marine isotope stages, as has been reported for the Atlantic and Pacific across the last glaciation. Consistent multi-proxy documentation of this repeated oxygen decline strongly supports the hypothesis that increased Indian Ocean glacial carbon storage played a significant role in atmospheric CO2 cycling and climate change over recent glacial/interglacial timescales.

Citation

Chang, L., Hoogakker, B. A., Heslop, D., Zhao, X., Roberts, A. P., De Deckker, P., Xue, P., Pei, Z., Zeng, F., Huang, R., Huang, B., Wang, S., Berndt, T. A., Leng, M., Stuut, J. B. W., & Harrison, R. J. (2023). Indian Ocean glacial deoxygenation and respired carbon accumulation during mid-late Quaternary ice ages. Nature Communications, 14, Article 4841. https://doi.org/10.1038/s41467-023-40452-1

• Journal Article Type: Article
• Acceptance Date: Jul 28, 2023
• Online Publication Date: Aug 10, 2023
• Publication Date: Aug 10, 2023
• Deposit Date: Nov 10, 2023
• Publicly Available Date: Nov 10, 2023
• Journal: Nature Communications
• Electronic ISSN: 2041-1723
• Publisher: Nature Publishing Group
• Peer Reviewed: Peer Reviewed
• Volume: 14
• Article Number: 4841
• DOI: https://doi.org/10.1038/s41467-023-40452-1
• Keywords: General Physics and Astronomy; General Biochemistry, Genetics and Molecular Biology; General Chemistry; Multidisciplinary
• Public URL: https://nottingham-repository.worktribe.com/output/24414164
• Publisher URL: https://www.nature.com/articles/s41467-023-40452-1
• Additional Information: Received: 20 June 2022; Accepted: 28 July 2023; First Online: 10 August 2023; : The authors declare no competing interests.