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Climate, pCO2 and terrestrial carbon cycle linkages during late Palaeozoic glacial-interglacial cycles

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dc.contributor.author Montañez, Isabel P. en
dc.contributor.author McElwain, Jennifer C. en
dc.contributor.author Poulsen, Christopher J. en
dc.contributor.author White, Joseph D. en
dc.contributor.author DiMichele, William A. en
dc.contributor.author Wilson, Jonathan P. en
dc.contributor.author Griggs, Galen en
dc.contributor.author Hren, Michael T. en
dc.date.accessioned 2017-03-08T23:09:55Z
dc.date.available 2017-03-08T23:09:55Z
dc.date.issued 2016
dc.identifier.citation 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. "<a href="https://repository.si.edu/handle/10088/31808">Climate, pCO2 and terrestrial carbon cycle linkages during late Palaeozoic glacial-interglacial cycles</a>." <em>Nature Geoscience</em>. 9 (11):824&ndash;828. <a href="https://doi.org/10.1038/ngeo2822">https://doi.org/10.1038/ngeo2822</a> en
dc.identifier.issn 1752-0894
dc.identifier.uri https://hdl.handle.net/10088/31808
dc.description.abstract 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. en
dc.relation.ispartof Nature Geoscience en
dc.title Climate, pCO2 and terrestrial carbon cycle linkages during late Palaeozoic glacial-interglacial cycles en
dc.type Journal Article en
dc.identifier.srbnumber 141173
dc.identifier.doi 10.1038/ngeo2822
rft.jtitle Nature Geoscience
rft.volume 9
rft.issue 11
rft.spage 824
rft.epage 828
dc.description.SIUnit NH-Paleobiology en
dc.description.SIUnit NMNH en
dc.citation.spage 824
dc.citation.epage 828

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