Publication Abstracts

Peteet et al. 2012

Peteet, D.M., M. Beh, C. Orr, D. Kurdyla, J.E. Nichols, and T.P. Guilderson, 2012: Delayed deglaciation or extreme Arctic conditions 21-16 cal. kyr at Southeastern Laurentide ice sheet margin? Geophys. Res. Lett., 39, L11706, doi:10.1029/2012GL051884.

The conventionally accepted ages of the Last Glacial Maximum (LGM) retreat of the southeastern Laurentide Ice Sheet (LIS) are 26-21 cal. kyr (derived from bulk-sediment radiocarbon ages) and 28-23 cal. kyr (varve estimates). Utilizing accelerator mass spectrometry (AMS) 14C dating of earliest macrofossils in 13 lake/bog inorganic clays, we find that vegetation first appeared on the landscape at 16-15 cal. kyr, suggesting ice had not retreated until that time. The gap between previous age estimates and ours is significant and has large implications for our understanding of ocean-atmosphere linkages. Older ages imply extreme Arctic conditions for 9-5 cal kyr; a landscape with no ice, yet no deposition in lakes. Our new AMS chronology of LIS retreat is consistent with marine evidence of deglaciation from the N. Atlantic, showing significant freshwater input and sea level rise only after 19 cal kyr with a cold meltwater lid, perhaps delaying ice melt.

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BibTeX Citation

@article{pe08400z,
  author={Peteet, D. M. and Beh, M. and Orr, C. and Kurdyla, D. and Nichols, J. E. and Guilderson, T. P.},
  title={Delayed deglaciation or extreme Arctic conditions 21-16 cal. kyr at Southeastern Laurentide ice sheet margin?},
  year={2012},
  journal={Geophys. Res. Lett.},
  volume={39},
  pages={L11706},
  doi={10.1029/2012GL051884},
}

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RIS Citation

TY  - JOUR
ID  - pe08400z
AU  - Peteet, D. M.
AU  - Beh, M.
AU  - Orr, C.
AU  - Kurdyla, D.
AU  - Nichols, J. E.
AU  - Guilderson, T. P.
PY  - 2012
TI  - Delayed deglaciation or extreme Arctic conditions 21-16 cal. kyr at Southeastern Laurentide ice sheet margin?
JA  - Geophys. Res. Lett.
VL  - 39
SP  - L11706
DO  - 10.1029/2012GL051884
ER  -

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