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Timing and nature of AMOC recovery across Termination 2 and magnitude of deglacial CO2 change

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  • Emily L. Deaney

    (School of Earth and Ocean Sciences, Cardiff University)

  • Stephen Barker

    (School of Earth and Ocean Sciences, Cardiff University)

  • Tina van de Flierdt

    (South Kensington Campus, Imperial College London)

Abstract

Large amplitude variations in atmospheric CO2 were associated with glacial terminations of the Late Pleistocene. Here we provide multiple lines of evidence suggesting that the ∼20 p.p.m.v. overshoot in CO2 at the end of Termination 2 (T2) ∼129 ka was associated with an abrupt (≤400 year) deepening of Atlantic Meridional Overturning Circulation (AMOC). In contrast to Termination 1 (T1), which was interrupted by the Bølling-Allerød (B-A), AMOC recovery did not occur until the very end of T2, and was characterized by pronounced formation of deep waters in the NW Atlantic. Considering the variable influences of ocean circulation change on atmospheric CO2, we suggest that the net change in CO2 across the last 2 terminations was approximately equal if the transient effects of deglacial oscillations in ocean circulation are taken into account.

Suggested Citation

  • Emily L. Deaney & Stephen Barker & Tina van de Flierdt, 2017. "Timing and nature of AMOC recovery across Termination 2 and magnitude of deglacial CO2 change," Nature Communications, Nature, vol. 8(1), pages 1-10, April.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms14595
    DOI: 10.1038/ncomms14595
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    Cited by:

    1. Xinwei Yan & Xu Zhang & Bo Liu & Huw T. Mithan & John Hellstrom & Sophie Nuber & Russell Drysdale & Junjie Wu & Fangyuan Lin & Ning Zhao & Yuao Zhang & Wengang Kang & Jianbao Liu, 2025. "Asynchronicity of deglacial permafrost thawing controlled by millennial-scale climate variability," Nature Communications, Nature, vol. 16(1), pages 1-12, December.

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