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Data Publisher for Earth & Environmental Science

Smith, James A; Hillenbrand, Claus-Dieter; Kuhn, Gerhard; Klages, Johann Philipp; Graham, Alastair G C; Larter, Robert D; Ehrmann, Werner; Moreton, Steven Grahame; Wiers, Steffen; Frederichs, Thomas (2014): Age determination for sediment cores from the Amundsen Sea Embayment. PANGAEA, https://doi.org/10.1594/PANGAEA.835462, Supplement to: Smith, JA et al. (2014): New constraints on the timing of West Antarctic Ice Sheet retreat in the eastern Amundsen Sea since the Last Glacial Maximum. Global and Planetary Change, 122, 224-237, https://doi.org/10.1016/j.gloplacha.2014.07.015

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Abstract:
Glaciers flowing into the Amundsen Sea Embayment (ASE) account for > 35% of the total discharge of the West Antarctic Ice Sheet (WAIS) and have thinned and retreated dramatically over the past two decades. Here we present detailed marine geological data and an extensive new radiocarbon dataset from the eastern ASE in order to constrain the retreat of the WAIS since the Last Glacial Maximum (LGM) and assess the significance of these recent changes. Our dating approach, relying mainly on the acid insoluble organic (AIO) fraction, utilises multi-proxy analyses of the sediments to characterise their lithofacies and determine the horizon in each core that would yield the most reliable age for deglaciation. In total, we dated 69 samples and show that deglaciation of the outer shelf was underway before 20,600 calibrated years before present (cal. yr BP), reaching the mid-shelf by 13,575 cal. yr BP and the inner shelf to within c.150 km of the present grounding line by 10,615 cal. yr BP. The timing of retreat is broadly consistent with previously published radiocarbon dates on biogenic carbonate from the eastern ASE as well as AIO 14C ages from the western ASE and provides new constraints for ice sheet models. The overall retreat trajectory - slow on the outer shelf, more rapid from the middle to inner shelf - clearly highlights the importance of reverse bedslopes in controlling phases of accelerated groundling line retreat. Despite revealing these broad scale trends, the current dataset does not capture detailed changes in ice flow, such as stillstands during grounding line retreat (i.e., deposition of grounding zone wedges) and possible readvances as depicted in the geomorphological record.
Coverage:
Median Latitude: -72.920947 * Median Longitude: -105.387368 * South-bound Latitude: -74.682500 * West-bound Longitude: -117.843000 * North-bound Latitude: -71.067800 * East-bound Longitude: -102.621300
Date/Time Start: 2006-02-08T23:59:00 * Date/Time End: 2010-03-20T08:42:00
Size:
30 datasets

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Datasets listed in this publication series

  1. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2014): (Table 2) Age determination of sediment core JR141_BC448. https://doi.org/10.1594/PANGAEA.835432
  2. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2014): (Table 2) Age determination of sediment core JR141_BC451. https://doi.org/10.1594/PANGAEA.835433
  3. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2014): (Table 2) Age determination of sediment core JR141_BC455. https://doi.org/10.1594/PANGAEA.835434
  4. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2014): (Table 2) Age determination of sediment core JR141_VC453. https://doi.org/10.1594/PANGAEA.835435
  5. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2014): (Table 2) Age determination of sediment core JR141_VC457. https://doi.org/10.1594/PANGAEA.835436
  6. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2014): (Table 2) Age determination of sediment core JR179_BC472. https://doi.org/10.1594/PANGAEA.835437
  7. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2014): (Table 2) Age determination of sediment core JR179_BC474. https://doi.org/10.1594/PANGAEA.835438
  8. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2014): (Table 2) Age determination of sediment core JR179_BC480. https://doi.org/10.1594/PANGAEA.835439
  9. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2014): (Table 2) Age determination of sediment core JR179_BC485. https://doi.org/10.1594/PANGAEA.835440
  10. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2014): (Table 2) Age determination of sediment core JR179_GC473. https://doi.org/10.1594/PANGAEA.835441
  11. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2014): (Table 2) Age determination of sediment core JR179_GC475. https://doi.org/10.1594/PANGAEA.835442
  12. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2014): (Table 2) Age determination of sediment core JR179_GC479. https://doi.org/10.1594/PANGAEA.835443
  13. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2014): (Table 2) Age determination of sediment core JR179_GC484. https://doi.org/10.1594/PANGAEA.835444
  14. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2014): (Table 2) Age determination of sediment core PS69/251-1. https://doi.org/10.1594/PANGAEA.835445
  15. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2014): (Table 2) Age determination of sediment core PS69/255-3. https://doi.org/10.1594/PANGAEA.835446
  16. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2014): (Table 2) Age determination of sediment core PS69/256-1. https://doi.org/10.1594/PANGAEA.835447
  17. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2014): (Table 2) Age determination of sediment core PS69/288-2. https://doi.org/10.1594/PANGAEA.835448
  18. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2014): (Table 2) Age determination of sediment core PS69/288-3. https://doi.org/10.1594/PANGAEA.835449
  19. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2014): (Table 2) Age determination of sediment core PS69/289-3. https://doi.org/10.1594/PANGAEA.835450
  20. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2014): (Table 2) Age determination of sediment core PS69/292-3. https://doi.org/10.1594/PANGAEA.835451
  21. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2014): (Table 2) Age determination of sediment core PS69/295-1. https://doi.org/10.1594/PANGAEA.835452
  22. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2014): (Table 2) Age determination of sediment core PS69/297-1. https://doi.org/10.1594/PANGAEA.835453
  23. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2014): (Table 2) Age determination of sediment core PS69/298-1. https://doi.org/10.1594/PANGAEA.835454
  24. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2014): (Table 2) Age determination of sediment core PS69/299-1. https://doi.org/10.1594/PANGAEA.835455
  25. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2014): (Table 2) Age determination of sediment core PS69/300-1. https://doi.org/10.1594/PANGAEA.835456
  26. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2014): (Table 2) Age determination of sediment core PS69/302-3. https://doi.org/10.1594/PANGAEA.835457
  27. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2014): (Table 2) Age determination of sediment core PS69/302-4. https://doi.org/10.1594/PANGAEA.835458
  28. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2014): (Table 2) Age determination of sediment core PS75/215-1. https://doi.org/10.1594/PANGAEA.835459
  29. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2014): (Table 2) Age determination of sediment core PS75/235-1. https://doi.org/10.1594/PANGAEA.835461
  30. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2014): (Table 3) Calibrated deglacial ages for the Amundsen Sea Embayment providing an upper and lower estimate for the minimum age of grounding line retreat. https://doi.org/10.1594/PANGAEA.835463