Climate, pCO2 and terrestrial carbon cycle linkages during late Palaeozoic glacial-interglacial cycles
Earth's last icehouse, 300 million years ago, is considered the longest-lived and most acute of the past half-billion years, characterized by expansive continental ice sheets and possibly tropical low-elevation glaciation. This atypical climate has long been attributed to anomalous radiative fo...
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ftsmithonian:oai:repository.si.edu:10088/31808 2023-05-15T16:41:04+02:00 Climate, pCO2 and terrestrial carbon cycle linkages during late Palaeozoic glacial-interglacial cycles Montañez, Isabel P. McElwain, Jennifer C. Poulsen, Christopher J. White, Joseph D. DiMichele, William A. Wilson, Jonathan P. Griggs, Galen Hren, Michael T. 2016 application/pdf https://hdl.handle.net/10088/31808 https://doi.org/10.1038/ngeo2822 unknown Nature Geoscience Montañez, Isabel P., McElwain, Jennifer C., Poulsen, Christopher J., White, Joseph D., DiMichele, William A., Wilson, Jonathan P., Griggs, Galen, and Hren, Michael T. 2016. " Climate, pCO2 and terrestrial carbon cycle linkages during late Palaeozoic glacial-interglacial cycles ." Nature Geoscience . 9 (11):824–828. https://doi.org/10.1038/ngeo2822 1752-0894 https://hdl.handle.net/10088/31808 141173 doi:10.1038/ngeo2822 Journal Article 2016 ftsmithonian https://doi.org/10.1038/ngeo2822 2020-09-09T18:35:39Z Earth's last icehouse, 300 million years ago, is considered the longest-lived and most acute of the past half-billion years, characterized by expansive continental ice sheets and possibly tropical low-elevation glaciation. This atypical climate has long been attributed to anomalous radiative forcing promoted by a 3% lower incident solar luminosity and sustained low atmospheric pCO2 (<=300 ppm). Climate models, however, indicate a CO2 sensitivity of ice-sheet distribution and sea-level response that questions this long-standing climate paradigm by revealing major discrepancy between hypothesized ice distribution, pCO2, and geologic records of glacioeustasy. Here we present a high-resolution record of atmospheric pCO2 for 16 million years of the late Palaeozoic, developed using soil carbonate-based and fossil leaf-based proxies, that resolves the climate conundrum. Palaeo-fluctuations on the 105-yr scale occur within the CO2 range predicted for anthropogenic change and co-vary with substantial change in sea level and ice volume. We further document coincidence between pCO2 changes and repeated restructuring of Euramerican tropical forests that, in conjunction with modelled vegetation shifts, indicate a more dynamic carbon sequestration history than previously considered and a major role for terrestrial vegetation-CO2 feedbacks in driving eccentricity-scale climate cycles of the late Palaeozoic icehouse. NH-Paleobiology NMNH Article in Journal/Newspaper Ice Sheet Unknown Nature Geoscience 9 11 824 828 |
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Earth's last icehouse, 300 million years ago, is considered the longest-lived and most acute of the past half-billion years, characterized by expansive continental ice sheets and possibly tropical low-elevation glaciation. This atypical climate has long been attributed to anomalous radiative forcing promoted by a 3% lower incident solar luminosity and sustained low atmospheric pCO2 (<=300 ppm). Climate models, however, indicate a CO2 sensitivity of ice-sheet distribution and sea-level response that questions this long-standing climate paradigm by revealing major discrepancy between hypothesized ice distribution, pCO2, and geologic records of glacioeustasy. Here we present a high-resolution record of atmospheric pCO2 for 16 million years of the late Palaeozoic, developed using soil carbonate-based and fossil leaf-based proxies, that resolves the climate conundrum. Palaeo-fluctuations on the 105-yr scale occur within the CO2 range predicted for anthropogenic change and co-vary with substantial change in sea level and ice volume. We further document coincidence between pCO2 changes and repeated restructuring of Euramerican tropical forests that, in conjunction with modelled vegetation shifts, indicate a more dynamic carbon sequestration history than previously considered and a major role for terrestrial vegetation-CO2 feedbacks in driving eccentricity-scale climate cycles of the late Palaeozoic icehouse. NH-Paleobiology NMNH |
format |
Article in Journal/Newspaper |
author |
Montañez, Isabel P. McElwain, Jennifer C. Poulsen, Christopher J. White, Joseph D. DiMichele, William A. Wilson, Jonathan P. Griggs, Galen Hren, Michael T. |
spellingShingle |
Montañez, Isabel P. McElwain, Jennifer C. Poulsen, Christopher J. White, Joseph D. DiMichele, William A. Wilson, Jonathan P. Griggs, Galen Hren, Michael T. Climate, pCO2 and terrestrial carbon cycle linkages during late Palaeozoic glacial-interglacial cycles |
author_facet |
Montañez, Isabel P. McElwain, Jennifer C. Poulsen, Christopher J. White, Joseph D. DiMichele, William A. Wilson, Jonathan P. Griggs, Galen Hren, Michael T. |
author_sort |
Montañez, Isabel P. |
title |
Climate, pCO2 and terrestrial carbon cycle linkages during late Palaeozoic glacial-interglacial cycles |
title_short |
Climate, pCO2 and terrestrial carbon cycle linkages during late Palaeozoic glacial-interglacial cycles |
title_full |
Climate, pCO2 and terrestrial carbon cycle linkages during late Palaeozoic glacial-interglacial cycles |
title_fullStr |
Climate, pCO2 and terrestrial carbon cycle linkages during late Palaeozoic glacial-interglacial cycles |
title_full_unstemmed |
Climate, pCO2 and terrestrial carbon cycle linkages during late Palaeozoic glacial-interglacial cycles |
title_sort |
climate, pco2 and terrestrial carbon cycle linkages during late palaeozoic glacial-interglacial cycles |
publishDate |
2016 |
url |
https://hdl.handle.net/10088/31808 https://doi.org/10.1038/ngeo2822 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
Nature Geoscience Montañez, Isabel P., McElwain, Jennifer C., Poulsen, Christopher J., White, Joseph D., DiMichele, William A., Wilson, Jonathan P., Griggs, Galen, and Hren, Michael T. 2016. " Climate, pCO2 and terrestrial carbon cycle linkages during late Palaeozoic glacial-interglacial cycles ." Nature Geoscience . 9 (11):824–828. https://doi.org/10.1038/ngeo2822 1752-0894 https://hdl.handle.net/10088/31808 141173 doi:10.1038/ngeo2822 |
op_doi |
https://doi.org/10.1038/ngeo2822 |
container_title |
Nature Geoscience |
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9 |
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11 |
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824 |
op_container_end_page |
828 |
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1766031504452878336 |