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Smith, James A; Hillenbrand, Claus-Dieter; Kuhn, Gerhard; Larter, Robert D; Graham, Alastair G C; Ehrmann, Werner; Moreton, Steven Grahame; Forwick, Matthias (2011): Sedimentary record of the western Amundsen Sea Embayment. PANGAEA, https://doi.org/10.1594/PANGAEA.754968, Supplement to: Smith, JA et al. (2011): Deglacial history of the West Antarctic Ice Sheet in the western Amundsen Sea Embayment. Quaternary Science Reviews, 30(5-6), 488-505, https://doi.org/10.1016/j.quascirev.2010.11.020

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Abstract:
The Amundsen Sea Embayment (ASE) drains approximately 35% of the West Antarctic Ice Sheet (WAIS) and is one of the most rapidly changing parts of the cryosphere. In order to predict future ice-sheet behaviour, modellers require long-term records of ice-sheet melting to constrain and build confidence in their simulations. Here, we present detailed marine geological and radiocarbon data along three palaeo-ice stream tributary troughs in the western ASE to establish vital information on the timing of deglaciation of the WAIS since the Last Glacial Maximum (LGM). We have undertaken multi-proxy analyses of the cores (core description, shear strength, x-radiographs, magnetic susceptibility, wet bulk density, total organic carbon/nitrogen, carbonate content and clay mineral analyses) in order to: (1) characterise the sedimentological facies and depositional environments; and (2) identify the horizon(s) in each core that would yield the most reliable age for deglaciation. In accordance with previous studies we identify three key facies, which offer the most reliable stratigraphies for dating deglaciation by recording the transition from a grounded ice sheet to open marine environments. These facies are: i) subglacial, ii) proximal grounding-line, and iii) seasonal open-marine. In addition, we incorporate ages from other facies (e.g., glaciomarine diamictons deposited at some distance from the grounding line, such as glaciogenic debris flows and iceberg rafted diamictons and turbates) into our deglacial model. In total, we have dated 78 samples (mainly the acid insoluble organic (AIO) fraction, but also calcareous foraminifers), which include 63 downcore and 15 surface samples. Through careful sample selection prior to dating, we have established a robust deglacial chronology for this sector of the WAIS. Our data show that deglaciation of the western ASE was probably underway as early as 22,351 calibrated years before present (cal 44 yr BP), reaching the mid-shelf by 13,837 cal yr BP and the inner shelf to within c.10-12 km of the present ice shelf front between 12,618 and 10,072 cal yr BP. The deglacial steps in the western ASE broadly coincide with the rapid rises in sea-level associated with global meltwater pulses 1a and 1b, although given the potential dating uncertainty, additional, more precise ages are required before these findings can be fully substantiated. Finally, we show that the rate of ice-sheet retreat increased across the deep (up to1,600 m) basins of the inner shelf, highlighting the importance of reverse slope and pinning points in accelerated phases of deglaciation.
Funding:
German Science Foundation (DFG), grant/award no. 5472008: Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas
Coverage:
Median Latitude: -73.477696 * Median Longitude: -114.825248 * South-bound Latitude: -74.136100 * West-bound Longitude: -118.163700 * North-bound Latitude: -71.813600 * East-bound Longitude: -111.623500
Date/Time Start: 2006-01-24T05:46:00 * Date/Time End: 2006-03-10T20:11:00
Event(s):
JR141_VC408 (VC408) * Latitude: -73.795100 * Longitude: -112.817600 * Date/Time: 2006-01-24T05:46:00 * Elevation: -787.0 m * Recovery: 3.68 m * Location: Amundsen Sea * Campaign: JR20060109 (JR141 JR150) * Basis: James Clark Ross * Method/Device: Vibro corer (VC)
JR141_VC411 (VC411) * Latitude: -73.567000 * Longitude: -116.845900 * Date/Time: 2006-01-26T21:40:00 * Elevation: -370.0 m * Recovery: 3.325 m * Location: Amundsen Sea * Campaign: JR20060109 (JR141 JR150) * Basis: James Clark Ross * Method/Device: Vibro corer (VC)
JR141_VC415 (VC415) * Latitude: -73.895800 * Longitude: -115.931100 * Date/Time: 2006-01-28T05:08:00 * Elevation: -918.0 m * Recovery: 4.34 m * Location: Amundsen Sea * Campaign: JR20060109 (JR141 JR150) * Basis: James Clark Ross * Method/Device: Vibro corer (VC)
Comment:
Further relevant data sets: Hillenbrand et al. (2010), doi:10.1594/PANGAEA.715974, Ehrmann et al. (2010), doi:10.1594/PANGAEA.755199
Size:
76 datasets

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Datasets listed in this publication series

  1. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Clay mineral composition of sediment core JR141_VC408. https://doi.org/10.1594/PANGAEA.755008
  2. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Grain-size composition and water content of sediment core JR141_VC408. https://doi.org/10.1594/PANGAEA.754948
  3. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Physical properties of sediment core JR141_VC408. https://doi.org/10.1594/PANGAEA.755177
  4. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Shear strength of sediment core JR141_VC408. https://doi.org/10.1594/PANGAEA.754831
  5. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Clay mineral composition of sediment core JR141_VC411. https://doi.org/10.1594/PANGAEA.755009
  6. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Grain-size composition and water content of sediment core JR141_VC411. https://doi.org/10.1594/PANGAEA.754949
  7. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Physical properties of sediment core JR141_VC411. https://doi.org/10.1594/PANGAEA.755178
  8. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Shear strength of sediment core JR141_VC411. https://doi.org/10.1594/PANGAEA.754832
  9. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Grain-size composition and water content of sediment core JR141_VC415. https://doi.org/10.1594/PANGAEA.754950
  10. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Physical properties of sediment core JR141_VC415. https://doi.org/10.1594/PANGAEA.755179
  11. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Physical properties and geochemistry of sediment core JR141_VC415. https://doi.org/10.1594/PANGAEA.754845
  12. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Shear strength of sediment core JR141_VC415. https://doi.org/10.1594/PANGAEA.754833
  13. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Grain-size composition and water content of sediment core JR141_VC417. https://doi.org/10.1594/PANGAEA.754951
  14. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Physical properties of sediment core JR141_VC417. https://doi.org/10.1594/PANGAEA.755180
  15. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Shear strength of sediment core JR141_VC417. https://doi.org/10.1594/PANGAEA.754834
  16. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Clay mineral composition of sediment core JR141_VC418. https://doi.org/10.1594/PANGAEA.755010
  17. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Grain-size composition and water content of sediment core JR141_VC418. https://doi.org/10.1594/PANGAEA.754952
  18. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Physical properties of sediment core JR141_VC418. https://doi.org/10.1594/PANGAEA.755181
  19. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Shear strength of sediment core JR141_VC418. https://doi.org/10.1594/PANGAEA.754835
  20. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Clay mineral composition of sediment core JR141_VC419. https://doi.org/10.1594/PANGAEA.755011
  21. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Grain-size composition and water content of sediment core JR141_VC419. https://doi.org/10.1594/PANGAEA.754953
  22. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Physical properties of sediment core JR141_VC419. https://doi.org/10.1594/PANGAEA.755182
  23. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Shear strength of sediment core JR141_VC419. https://doi.org/10.1594/PANGAEA.754836
  24. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Clay mineral composition of sediment core JR141_VC422. https://doi.org/10.1594/PANGAEA.755012
  25. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Grain-size composition and water content of sediment core JR141_VC422. https://doi.org/10.1594/PANGAEA.754954
  26. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Physical properties of sediment core JR141_VC422. https://doi.org/10.1594/PANGAEA.755183
  27. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Physical properties and geochemistry of sediment core JR141_VC422. https://doi.org/10.1594/PANGAEA.754846
  28. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Shear strength of sediment core JR141_VC422. https://doi.org/10.1594/PANGAEA.754837
  29. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Clay mineral composition of sediment core JR141_VC424. https://doi.org/10.1594/PANGAEA.755013
  30. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Grain-size composition and water content of sediment core JR141_VC424. https://doi.org/10.1594/PANGAEA.754955
  31. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Physical properties and geochemistry of sediment core JR141_VC424. https://doi.org/10.1594/PANGAEA.754847
  32. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Clay mineral composition of sediment core JR141_VC425. https://doi.org/10.1594/PANGAEA.755014
  33. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Grain-size composition and water content of sediment core JR141_VC425. https://doi.org/10.1594/PANGAEA.754956
  34. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Clay mineral composition of sediment core JR141_VC427. https://doi.org/10.1594/PANGAEA.755015
  35. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Grain-size composition and water content of sediment core JR141_VC427. https://doi.org/10.1594/PANGAEA.754957
  36. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Physical properties of sediment core JR141_VC427. https://doi.org/10.1594/PANGAEA.755186
  37. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Shear strength of sediment core JR141_VC427. https://doi.org/10.1594/PANGAEA.754840
  38. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Clay mineral composition of sediment core JR141_VC428. https://doi.org/10.1594/PANGAEA.755016
  39. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Grain-size composition and water content of sediment core JR141_VC428. https://doi.org/10.1594/PANGAEA.754958
  40. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Physical properties of sediment core JR141_VC428. https://doi.org/10.1594/PANGAEA.755187
  41. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Physical properties and geochemistry of sediment core JR141_VC428. https://doi.org/10.1594/PANGAEA.754848
  42. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Shear strength of sediment core JR141_VC428. https://doi.org/10.1594/PANGAEA.754841
  43. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Clay mineral composition of sediment core JR141_VC430. https://doi.org/10.1594/PANGAEA.755017
  44. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Grain-size composition and water content of sediment core JR141_VC430. https://doi.org/10.1594/PANGAEA.754959
  45. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Physical properties of sediment core JR141_VC430. https://doi.org/10.1594/PANGAEA.755188
  46. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Physical properties and geochemistry of sediment core JR141_VC430. https://doi.org/10.1594/PANGAEA.754849
  47. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Shear strength of sediment core JR141_VC430. https://doi.org/10.1594/PANGAEA.754842
  48. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Clay mineral composition of sediment core JR141_VC436. https://doi.org/10.1594/PANGAEA.755018
  49. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Grain-size composition and water content of sediment core JR141_VC436. https://doi.org/10.1594/PANGAEA.754960
  50. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Physical properties of sediment core JR141_VC436. https://doi.org/10.1594/PANGAEA.755189
  51. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Shear strength of sediment core JR141_VC436. https://doi.org/10.1594/PANGAEA.754843
  52. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Clay mineral composition of sediment core PS69/265-3. https://doi.org/10.1594/PANGAEA.755019
  53. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Grain-size composition and water content of sediment core PS69/265-3. https://doi.org/10.1594/PANGAEA.754961
  54. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Physical properties of sediment core PS69/265-3. https://doi.org/10.1594/PANGAEA.755190
  55. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Physical properties and geochemistry of sediment core PS69/265-3. https://doi.org/10.1594/PANGAEA.754851
  56. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Shear strength of sediment core PS69/265-3. https://doi.org/10.1594/PANGAEA.754824
  57. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Physical properties of sediment core PS69/267-1. https://doi.org/10.1594/PANGAEA.755191
  58. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Physical properties and geochemistry of sediment core PS69/267-1. https://doi.org/10.1594/PANGAEA.754852
  59. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Clay mineral composition of sediment core PS69/267-2. https://doi.org/10.1594/PANGAEA.755020
  60. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Grain-size composition and water content of sediment core PS69/267-2. https://doi.org/10.1594/PANGAEA.754962
  61. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Shear strength of sediment core PS69/267-2. https://doi.org/10.1594/PANGAEA.754825
  62. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Grain-size composition and water content of sediment core PS69/273-2. https://doi.org/10.1594/PANGAEA.754963
  63. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Total organic carbon content of sediment core PS69/273-2. https://doi.org/10.1594/PANGAEA.754818
  64. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Clay mineral composition of sediment core PS69/274-1. https://doi.org/10.1594/PANGAEA.755021
  65. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Grain-size composition and water content of sediment core PS69/274-1. https://doi.org/10.1594/PANGAEA.754964
  66. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Physical properties and geochemistry of sediment core PS69/274-1. https://doi.org/10.1594/PANGAEA.754853
  67. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Grain-size composition and water content of sediment core PS69/275-1. https://doi.org/10.1594/PANGAEA.754965
  68. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Clay mineral composition of sediment core PS69/280-1. https://doi.org/10.1594/PANGAEA.755022
  69. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Grain-size composition and water content of sediment core PS69/280-1. https://doi.org/10.1594/PANGAEA.754966
  70. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Physical properties of sediment core PS69/280-1. https://doi.org/10.1594/PANGAEA.755195
  71. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Physical properties and geochemistry of sediment core PS69/280-1. https://doi.org/10.1594/PANGAEA.754854
  72. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Shear strength of sediment core PS69/280-1. https://doi.org/10.1594/PANGAEA.754829
  73. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Grain-size composition and water content of sediment core PS69/283-6. https://doi.org/10.1594/PANGAEA.754967
  74. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Physical properties of sediment core PS69/283-6. https://doi.org/10.1594/PANGAEA.755196
  75. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Physical properties and geochemistry of sediment core PS69/283-6. https://doi.org/10.1594/PANGAEA.754855
  76. Smith, JA; Hillenbrand, C-D; Kuhn, G et al. (2010): Shear strength of sediment core PS69/283-6. https://doi.org/10.1594/PANGAEA.754830