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Deglacial Subantarctic CO2 outgassing driven by a weakened solubility pump

Author

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  • Yuhao Dai

    (The Australian National University
    Lund University)

  • Jimin Yu

    (The Australian National University
    Pilot National Laboratory for Marine Science and Technology (Qingdao))

  • Haojia Ren

    (National Taiwan University)

  • Xuan Ji

    (The Australian National University)

Abstract

The Subantarctic Southern Ocean has long been thought to be an important contributor to increases in atmospheric carbon dioxide partial pressure (pCO2) during glacial-interglacial transitions. Extensive studies suggest that a weakened biological pump, a process associated with nutrient utilization efficiency, drove up surface-water pCO2 in this region during deglaciations. By contrast, regional influences of the solubility pump, a process mainly linked to temperature variations, have been largely overlooked. Here, we evaluate relative roles of the biological and solubility pumps in determining surface-water pCO2 variabilities in the Subantarctic Southern Ocean during the last deglaciation, based on paired reconstructions of surface-water pCO2, temperature, and nutrient utilization efficiency. We show that compared to the biological pump, the solubility pump imposed a strong impact on deglacial Subantarctic surface-water pCO2 variabilities. Our findings therefore reveal a previously underappreciated role of the solubility pump in modulating deglacial Subantarctic CO2 release and possibly past atmospheric pCO2 fluctuations.

Suggested Citation

  • Yuhao Dai & Jimin Yu & Haojia Ren & Xuan Ji, 2022. "Deglacial Subantarctic CO2 outgassing driven by a weakened solubility pump," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-32895-9
    DOI: 10.1038/s41467-022-32895-9
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