Deglacial Subantarctic CO2 outgassing driven by a weakened solubility pump

Yuhao Dai (), Jimin Yu (), Haojia Ren and Xuan Ji
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Yuhao Dai: The Australian National University
Jimin Yu: The Australian National University
Haojia Ren: National Taiwan University
Xuan Ji: The Australian National University

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: 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.

Date: 2022
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DOI: 10.1038/s41467-022-32895-9

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