Earliest Holocene south Greenland ice sheet retreat within its late Holocene extent Public Deposited

http://ir.library.oregonstate.edu/concern/articles/5t34sm35g

To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The published article is copyrighted by the American Geophysical Union and can be found at:  http://agupubs.onlinelibrary.wiley.com/agu/journal/10.1002/%28ISSN%291944-8007/.

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  • Early Holocene summer warmth drove dramatic Greenland ice sheet (GIS) retreat. Subsequent insolation-driven cooling caused GIS margin readvance to late Holocene maxima, from which ice margins are now retreating. We use ¹⁰Be surface exposure ages from four locations between 69.4°N and 61.2°N to date when in the early Holocene south to west GIS margins retreated to within these late Holocene maximum extents. We find that this occurred at 11.1 ± 0.2 ka to 10.6 ± 0.5 ka in south Greenland, significantly earlier than previous estimates, and 6.8 ± 0.1 ka to 7.9 ± 0.1 ka in southwest to west Greenland, consistent with existing ¹⁰Be ages. At least in south Greenland, these ¹⁰Be ages likely provide a minimum constraint for when on a multicentury timescale summer temperatures after the last deglaciation warmed above late Holocene temperatures in the early Holocene. Current south Greenland ice margin retreat suggests that south Greenland may have now warmed to or above earliest Holocene summer temperatures.
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  • Carlson, A. E., K. Winsor, D. J. Ullman, E. J. Brook, D. H. Rood, Y. Axford, A. N. LeGrande, F. S. Anslow, and G. Sinclair (2014), Earliest Holocene south Greenland ice sheet retreat within its late Holocene extent. Geophysical Research Letters, 41, 5514–5521. doi:10.1002/2014GL060800
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  • description.provenance : Approved for entry into archive by Erin Clark(erin.clark@oregonstate.edu) on 2014-10-10T15:41:48Z (GMT) No. of bitstreams: 2 CarlsonAndersCEOASEarliestHoloceneSouth.pdf: 2192682 bytes, checksum: 4611c89cfab88e0b71f3108c44dc18fb (MD5) CarlsonAndersCEOASEarliestHoloceneSouth_AuxiliaryMaterial.zip: 10203631 bytes, checksum: 6309782b26d4bb819d525bf62c7374bc (MD5)
  • description.provenance : Submitted by Erin Clark (erin.clark@oregonstate.edu) on 2014-10-10T15:41:23Z No. of bitstreams: 2 CarlsonAndersCEOASEarliestHoloceneSouth.pdf: 2192682 bytes, checksum: 4611c89cfab88e0b71f3108c44dc18fb (MD5) CarlsonAndersCEOASEarliestHoloceneSouth_AuxiliaryMaterial.zip: 10203631 bytes, checksum: 6309782b26d4bb819d525bf62c7374bc (MD5)
  • description.provenance : Made available in DSpace on 2014-10-10T15:41:48Z (GMT). No. of bitstreams: 2 CarlsonAndersCEOASEarliestHoloceneSouth.pdf: 2192682 bytes, checksum: 4611c89cfab88e0b71f3108c44dc18fb (MD5) CarlsonAndersCEOASEarliestHoloceneSouth_AuxiliaryMaterial.zip: 10203631 bytes, checksum: 6309782b26d4bb819d525bf62c7374bc (MD5) Previous issue date: 2014-08-16

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