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

Published version
Peer-reviewed

Repository DOI


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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.

Description

Acknowledgements: This study was supported by the National Natural Science Foundation of China (NSFC grant 41974074 to L.C.), a Royal Society-Newton Advanced Fellowship (NAF\R1\201096), and a joint NSFC grant (42061130214) to L.C. and R.J.H., the UK Research and Innovation (UKRI Future Leaders Fellowships grant MR/S034293/1 to B.A.A.H.), and the Australian Research Council (ARC grants DP160100805 and DP200100765 to A.P.R. and D.H.).

Keywords

3709 Physical Geography and Environmental Geoscience, 31 Biological Sciences, 3103 Ecology, 37 Earth Sciences, 3702 Climate Change Science, 3705 Geology, 13 Climate Action

Journal Title

Nat Commun

Conference Name

Journal ISSN

2041-1723
2041-1723

Volume Title

14

Publisher

Springer Science and Business Media LLC
Sponsorship
National Natural Science Foundation of China (National Science Foundation of China) (41974074, 42061130214)
Royal Society (NAF\R1\201096)