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Final deglaciation of the Scandinavian Ice Sheet and implications for the Holocene global sea-level budget Public Deposited

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  • The last deglaciation of the Scandinavian Ice Sheet (SIS) from ∼21,000 to 13,000 yr ago is well-constrained by several hundred ¹⁰Be and ¹⁴C ages. The subsequent retreat history, however, is established primarily from minimum-limiting ¹⁴C ages and incomplete Baltic-Sea varve records, leaving a substantial fraction of final SIS retreat history poorly constrained. Here we develop a high-resolution chronology for the final deglaciation of the SIS based on 79 ¹⁰Be cosmogenic exposure dates sampled along three transects spanning southern to northern Sweden and Finland. Combining this new chronology with existing ¹⁰Be ages on deglaciation since the Last Glacial Maximum shows that rates of SIS margin retreat were strongly influenced by deglacial millennial-scale climate variability and its effect on surface mass balance, with regional modulation of retreat associated with dynamical controls. Ice-volume estimates constrained by our new chronology suggest that the SIS contributed ∼8 m sea-level equivalent to global sea-level rise between ∼14.5 ka and 10 ka. Final deglaciation was largely complete by ∼10.5 ka, with highest rates of sea-level rise occurring during the Bølling–Allerød, a 50% decrease during the Younger Dryas, and a rapid increase during the early Holocene. Combining our SIS volume estimates with estimated contributions from other remaining Northern Hemisphere ice sheets suggests that the Antarctic Ice Sheet (AIS) contributed 14.4±5.9 m to global sea-level rise since ∼13 ka. This new constraint supports those studies that indicate that an ice volume of 15 m or more of equivalent sea-level rise was lost from the AIS during the last deglaciation.
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  • Cuzzone, J. K., Clark, P. U., Carlson, A. E., Ullman, D. J., Rinterknecht, V. R., Milne, G. A., ... & Caffee, M. (2016). Final deglaciation of the Scandinavian Ice Sheet and implications for the Holocene global sea-level budget. Earth and Planetary Science Letters, 448, 34-41. doi:10.1016/j.epsl.2016.05.019
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  • Research was supported by a GSA graduate student research grant to JKC, NSF grant EAR-0958417 to PUC, and NSF grants EAR-0958872 and EAR-1343573 to AEC. PRIME Lab is supported by NSF grant EAR-0844151.
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  • description.provenance : Made available in DSpace on 2016-08-02T20:57:31Z (GMT). No. of bitstreams: 4 krauserp673304182.zip: 2014565 bytes, checksum: 2440f91d2047036bd44c53c5decc3e55 (MD5) CuzzoneFinalDeglaciationoftheScandinavian.pdf: 1562729 bytes, checksum: 8ca7bcb0682f043f2a9022e0dc600aee (MD5) CuzzoneFinalDeglaciationoftheScandinavianSupplementaryInfo.pdf: 463586 bytes, checksum: d6b49394c932e921831e115aa64af6c3 (MD5) CuzzoneFinalDeglaciationoftheScandinavianSupplementaryTables.xlsx: 165403 bytes, checksum: 207de0cac0042b3ecbe49c1cd3a3fa71 (MD5) Previous issue date: 2016-08-15
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