Boron isotope data on uranium-thorium dated Desmophyllum dianthus deep sea corals from the Southern Ocean over the last 40,000 years ...
The cause of changes in atmospheric carbon dioxide (CO₂) during the recent ice ages is yet to be fully explained. Most mechanisms for glacial–interglacial CO₂ change have centred on carbon exchange with the deep ocean, owing to its large size and relatively rapid exchange with the atmosphere. The So...
| Main Authors: | , , , , , , , , , , , |
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| Format: | Article in Journal/Newspaper |
| Language: | English |
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PANGAEA
2018
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.1594/pangaea.894761 https://doi.pangaea.de/10.1594/PANGAEA.894761 |
| Summary: | The cause of changes in atmospheric carbon dioxide (CO₂) during the recent ice ages is yet to be fully explained. Most mechanisms for glacial–interglacial CO₂ change have centred on carbon exchange with the deep ocean, owing to its large size and relatively rapid exchange with the atmosphere. The Southern Ocean is thought to have a key role in this exchange, as much of the deep ocean is ventilated to the atmosphere in this region. However, it is difficult to reconstruct changes in deep Southern Ocean carbon storage, so few direct tests of this hypothesis have been carried out. Here we present deep-sea coral boron isotope data that track the pH—and thus the CO₂ chemistry—of the deep Southern Ocean over the past forty thousand years. At sites closest to the Antarctic continental margin, and most influenced by the deep southern waters that form the ocean's lower overturning cell, we find a close relationship between ocean pH and atmospheric CO₂: during intervals of low CO₂, ocean pH is low, reflecting enhanced ... : Supplement to: Rae, James W B; Burke, Andrea; Robinson, Laura F; Adkins, Jess F; Chen, Tianyu; Cole, Catherine; Greenop, Rosanna; Li, Tao; Littley, Eloise; Nita, Dan; Stewart, Joseph A; Taylor, Ben J (2018): CO2 storage and release in the deep Southern Ocean on millennial to centennial timescales. Nature, 562(7728), 569-573 ... |
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