Deglacial Subantarctic CO2 outgassing driven by a weakened solubility pump
The Subantarctic Southern Ocean has long been thought to be an importantcontributor to increases in atmospheric carbon dioxide partial pressure(pCO2) during glacial-interglacial transitions. Extensive studies suggest that aweakened biological pump, a process associated with nutrient utilizationeffic...
| Published in: | Nature Communications |
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| Main Authors: | , , , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Nature Publishing Group
2022
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| Subjects: | |
| Online Access: | https://lup.lub.lu.se/record/f7e42bdf-cc0e-405f-b7f5-f029eab92f75 https://doi.org/10.1038/s41467-022-32895-9 |
| Summary: | The Subantarctic Southern Ocean has long been thought to be an importantcontributor to increases in atmospheric carbon dioxide partial pressure(pCO2) during glacial-interglacial transitions. Extensive studies suggest that aweakened biological pump, a process associated with nutrient utilizationefficiency, drove up surface-water pCO2in this region during deglaciations. Bycontrast, regional influences of the solubility pump, a process mainly linked totemperature variations, have been largely overlooked. Here, we evaluaterelative roles of the biological and solubility pumps in determining surface-water pCO2variabilities in the Subantarctic Southern Ocean during the lastdeglaciation, based on paired reconstructions of surface-water pCO2,tem-perature, and nutrient utilization efficiency. We show that compared to thebiological pump, the solubility pumpimposed a strong impact on deglacialSubantarctic surface-water pCO2variabilities. Ourfindings therefore reveal apreviously underappreciated role of the solubility pump in modulatingdeglacial Subantarctic CO2release and possibly past atmospheric pCO2fluctuations. |
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