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An atmospheric chronology for the glacial-deglacial Eastern Equatorial Pacific

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  • Ning Zhao

    (Massachusetts Institute of Technology—Woods Hole Oceanographic Institution Joint Program in Oceanography
    Max Planck Institute for Chemistry)

  • Lloyd D. Keigwin

    (Woods Hole Oceanographic Institution)

Abstract

Paleoclimate reconstructions are only as good as their chronology. In particular, different chronological assumptions for marine sediment cores can lead to different reconstructions of ocean ventilation age and atmosphere−ocean carbon exchange history. Here we build the first high-resolution chronology that is free of the dating uncertainties common in marine sediment records, based on radiocarbon dating twigs found with computed tomography scans in two cores from the Eastern Equatorial Pacific (EEP). With this accurate chronology, we show that the ventilation ages of the EEP thermocline and intermediate waters were similar to today during the Last Glacial Maximum and deglaciation, in contradiction with previous studies. Our results suggest that the glacial respired carbon pool in the EEP was not significantly older than today, and that the deglacial strengthening of the equatorial Pacific carbon source was probably driven by low-latitude processes rather than an increased subsurface supply of upwelled carbon from high-latitude oceans.

Suggested Citation

  • Ning Zhao & Lloyd D. Keigwin, 2018. "An atmospheric chronology for the glacial-deglacial Eastern Equatorial Pacific," Nature Communications, Nature, vol. 9(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-05574-x
    DOI: 10.1038/s41467-018-05574-x
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    Cited by:

    1. Jingyu Liu & Yipeng Wang & Samuel L. Jaccard & Nan Wang & Xun Gong & Nianqiao Fang & Rui Bao, 2023. "Pre-aged terrigenous organic carbon biases ocean ventilation-age reconstructions in the North Atlantic," Nature Communications, Nature, vol. 14(1), pages 1-9, December.

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