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Global oceanic oxygenation controlled by the Southern Ocean through the last deglaciation
Wang, Y.; Costa, K.M.; Lu, W.; Hines, S.K.V.; Nielsen, S.G. (2024). Global oceanic oxygenation controlled by the Southern Ocean through the last deglaciation. Advanced Science 10(3): eadk2506. https://dx.doi.org/10.1126/sciadv.adk2506
In: Advanced Science. Wiley: Hoboken. e-ISSN 2198-3844
Peer reviewed article  
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  • Wang, Y.
  • Costa, K.M.
  • Lu, W.
  • Hines, S.K.V.
  • Nielsen, S.G.
Abstract
    Ocean dissolved oxygen (DO) can provide insights on how the marine carbon cycle affects global climate change. However, the net global DO change and the controlling mechanisms remain uncertain through the last deglaciation. Here, we present a globally integrated DO reconstruction using thallium isotopes, corroborating lower global DO during the Last Glacial Maximum [19 to 23 thousand years before the present (ka B.P.)] relative to the Holocene. During the deglaciation, we reveal reoxygenation in the Heinrich Stadial 1 (~14.7 to 18 ka B.P.) and the Younger Dryas (11.7 to 12.9 ka B.P.), with deoxygenation during the Bølling-Allerød (12.9 to 14.7 ka B.P.). The deglacial DO changes were decoupled from North Atlantic Deep Water formation rates and imply that Southern Ocean ventilation controlled ocean oxygen. The coherence between global DO and atmospheric CO2 on millennial timescales highlights the Southern Ocean’s role in deglacial atmospheric CO2 rise.
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