TY - JOUR
T1 - Indian Ocean glacial deoxygenation and respired carbon accumulation during mid-late Quaternary ice ages
AU - Chang, Liao
AU - Hoogakker, Babette A. A.
AU - Heslop, David
AU - Zhao, Xiang
AU - Roberts, Andrew P.
AU - De Deckker, Patrick
AU - Xue, Pengfei
AU - Pei, Zhaowen
AU - Zeng, Fan
AU - Huang, Rong
AU - Huang, Baoqi
AU - Wang, Shishun
AU - Berndt, Thomas A.
AU - Leng, Melanie
AU - Stuut, Jan-Berend W.
AU - Harrison, Richard J.
PY - 2023/8/10
Y1 - 2023/8/10
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85167659900&partnerID=8YFLogxK
U2 - 10.1038/s41467-023-40452-1
DO - 10.1038/s41467-023-40452-1
M3 - Article
C2 - 37563128
SN - 2041-1723
VL - 14
JO - Nature Communications
JF - Nature Communications
M1 - 4841
ER -
