Greenland deglaciation puzzles
Abstract
About 23,000 years ago, the southern margins of the great Northern Hemisphere ice sheets across Europe and North America began to melt. The melt rate accelerated ∼20,000 years ago, and global sea level eventually rose by ∼130 m as meltwater flowed into the oceans. Ice cores from the Greenland and Antarctic ice sheets show the rise in atmospheric CO2 concentrations that accompanied this shift in global ice volume and climate. However, discrepancies in the temperature reconstructions from these cores have raised questions about the long-term relationship between atmospheric CO2 concentrations and Arctic temperature. On page 1177 of this issue, Buizert et al. (1) report temperature reconstructions from three locations on the Greenland ice sheet that directly address these problems.
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References and Notes
1
Buizert C., et al., Science 345, 1177 (2014).
2
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13
The Antarctic ice core record is an average of the Dome C, EPICA (European Project for Ice Coring in Antarctica) Dronning Maud Land, and Vostock water isotopes. The Greenland record is an average of the North Greenland Ice Core Project (NGRIP), GRIP, Greenland Ice Sheet Project 2, and Renland ice cores. Envelopes show the maximum and minimum values from each set of cores. Each ice core record is shown as an anomaly relative to the past 3000 years. All cores are on the Lemieux-Dudon et al. (11) time scale and are low-pass filtered at 3000 years for clarity. The summer Northern Hemisphere insolation record is solstice insolation at 60°N (W m−1). The CO2 (ppmv) record is from Lüthi et al. (12).
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Science
Volume 345 | Issue 6201
5 September 2014
5 September 2014
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Copyright © 2014, American Association for the Advancement of Science.
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Published in print: 5 September 2014
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