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Global warming preceded by increasing carbon dioxide concentrations during the last deglaciation

Shakun, Jeremy D., Clark, Peter U, He, Feng, Marcott, Shaun A., Mix, Alan C., Liu, Zhengyu, Otto-Bliesner, Bette, Schmittner, Andreas and Bard, Edouard (2012) Global warming preceded by increasing carbon dioxide concentrations during the last deglaciation. NATURE, 484 (7392). 49+. [Journal article]

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DOI: 10.1038/nature10915


The covariation of carbon dioxide (CO2) concentration and temperature in Antarctic ice-core records suggests a close link between CO2 and climate during the Pleistocene ice ages. The role and relative importance of CO2 in producing these climate changes remains unclear, however, in part because the ice-core deuterium record reflects local rather than global temperature. Here we construct a record of global surface temperature from 80 proxy records and show that temperature is correlated with and generally lags CO2 during the last (that is, the most recent) deglaciation. Differences between the respective temperature changes of the Northern Hemisphere and Southern Hemisphere parallel variations in the strength of the Atlantic meridional overturning circulation recorded in marine sediments. These observations, together with transient global climate model simulations, support the conclusion that an antiphased hemispheric temperature response to ocean circulation changes superimposed on globally in-phase warming driven by increasing CO2 concentrations is an explanation for much of the temperature change at the end of the most recent ice age.

Item Type:Journal article
Faculties and Schools:Faculty of Life and Health Sciences > School of Geography and Environmental Sciences
Faculty of Life and Health Sciences
Research Institutes and Groups:Environmental Sciences Research Institute > Quaternary Environmental Change
Environmental Sciences Research Institute
ID Code:27114
Deposited By: Mrs Linda Allen
Deposited On:29 Sep 2013 08:21
Last Modified:29 Sep 2013 08:21

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