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| Shao, Jun; Stott, Lowell D.; Gray, William R.; Greenop, Rosanna; Pecher, Ingo; Neil, Helen L.; Coffin, Richard B.; Davy, Bryan; Rae, James W.b.. |
| Identifying processes within the Earth System that have modulated atmospheric pCO2 during each glacial cycle of the late Pleistocene stands as one of the grand challenges in climate science. The growing array of surface ocean pH estimates from the boron isotope proxy across the last glacial termination may reveal regions of the ocean that influenced the timing and magnitude of pCO2 rise. Here we present two new boron isotope records from the subtropical‐subpolar transition zone of the Southwest Pacific that span the last 20 kyr, as well as new radiocarbon data from the same cores. The new data suggest this region was a source of carbon to the atmosphere rather than a moderate sink as it is today. Significantly higher outgassing is observed between ~16.5‐14... |
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| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00514/62525/66838.pdf |
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| Gray, William R.; Rae, James W. B.; Wills, Robert C. J.; Shevenell, Amelia E.; Taylor, Ben; Burke, Andrea; Foster, Gavin L.; Lear, Caroline H.. |
| The interplay between ocean circulation and biological productivity affects atmospheric CO2 levels and marine oxygen concentrations. During the warming of the last deglaciation, the North Pacific experienced a peak in productivity and widespread hypoxia, with changes in circulation, iron supply and light limitation all proposed as potential drivers. Here we use the boronisotope composition of planktic foraminifera from a sediment core in the western North Pacific to reconstruct pH and dissolved CO2 concentrations from 24,000 to 8,000 years ago. We find that the productivity peak during the Bolling-Allerod warm interval, 14,700 to 12,900 years ago, was associated with a decrease in near-surface pH and an increase in pCO(2), and must therefore have been... |
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| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00496/60787/64968.pdf |
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