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Grobe, Hannes; Mackensen, Andreas (1992): Sedimentology and age models of cores from the Antarctic continental margin in the eastern Weddell Sea. PANGAEA, https://doi.org/10.1594/PANGAEA.588236, Supplement to: Grobe, H; Mackensen, A (1992): Late Quaternary climatic cycles as recorded in sediments from the Antarctic continental margin. In: Kennett, James P & Warnke, Detlef A (eds.), The Antarctic Paleoenvironment: a perspective on Global Change, Antarctic Research Series, American Geophysical Union, DOI:10.1029/AR056p0349, 56, 349-376, hdl:10013/epic.11662.d001

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Abstract:
To reveal the late Quaternary paleoenvironmental changes at the Antarctic continental margin, we test a lithostratigraphy, adjusted to a stable isotope record from the eastern Weddell Sea. The stratigraphy is used to produce a stacked sedimentological data set of eleven sediment cores. We derive a general model of glacio marine sedimentation and paleoenvironmental changes at the East Antarctic continental margin during the last two climatic cycles (300 kyr).
The sedimentary processes considered include biological productivity, ice-rafting, current transport, and gravitational downslope transport. These processes are controlled by a complex interaction of sea-level changes and paleoceanographic and paleoglacial conditions in response to changes of global climate and local insolation. Sedimentation rates are mainly controlled by ice-rafting which reflects mass balance and behaviour of the Antarctic ice sheet. The sedimentation rates decrease with distance from the continent and from interglacial to glacial. Highest rates occur at the very beginning of interglacials, i.e. of oxygen isotope events 7.5, 5.5, and 1.1, these being up to five times higher than during glacials.
The sediments can be classified into five distinct facies and correlated to different paleoenvironments: at glacial terminations (isotope events 8.0, 6.0, and 2.0), the Antarctic cryosphere adjusts to new climatic conditions. The sedimentary processes are controlled by the rise of sea level, the destruction of ice shelves, the retreat of sea-ice and the recommenced feeding of warm North Atlantic Deep Water (NADW) to the Circumpolar Deep Water (CDW). During peak warm interglacial periods (at isotope events 7.5, 7.3, 5.5., and 1.1), the CDW promotes warmer surface waters and thus the retreat of sea-ice which in turn controls the availability of light in surface waters. At distinct climatic thresholds local insolation might also influence sea-ice distribution. Primary productivity and bioturbation increase, the CCD rises and carbonate dissolution occurs in slope sediments also in shallow depth. Ice shelves and coastal polynyas favour the formation of very cold and saline Ice Shelf Water (ISW) which contributes to bottom water formation. During the transition from a peak warm time to a glacial (isotope stages 7.2-7.0, and 5.4-5.0) the superimposition of both intense ice-rafting and reduced bottom currents produces a typical facies which occurs with a distinct lag in the time of response of specific sedimentary processes to climatic change. With the onset of a glacial (at isotope events 7.0 and 5.0) the Antarctic ice sheet expands due to the lowering of sea-level with the extensive glaciations in the northern Hemisphere. Gravitational sediment transport becomes the most active process, and sediment transfer to the deep sea is provided by turbidity currents through canyon systems. During Antarctic glacial maxima (isotope stages between 7.0-6.0, and 5.0-2.0) the strongly reduced input of NADW into the Southern Ocean favours further advances of the ice shelves far beyond the shelf break and the continous formation of sea ice. Below ice shelves and/or closed sea ice coverage contourites are deposited on the slope.
Keyword(s):
gcmd1; timesliceagemodel
Coverage:
Median Latitude: -70.067359 * Median Longitude: -9.181516 * South-bound Latitude: -72.333330 * West-bound Longitude: -16.500000 * North-bound Latitude: -68.326660 * East-bound Longitude: -5.616660
Date/Time Start: 1983-02-06T00:00:00 * Date/Time End: 1988-03-01T17:26:00
Event(s):
PS1006-1 (PS01/132) * Latitude: -71.493000 * Longitude: -13.271830 * Date/Time: 1983-02-06T00:00:00 * Elevation: -234.0 m * Penetration: 0.6 m * Recovery: 0.55 m * Location: Kapp Norvegia * Campaign: ANT-I/2 (PS01) * Basis: Polarstern * Device: Gravity corer (Kiel type) (SL)
PS1265-1 (PS06/246) * Latitude: -71.351700 * Longitude: -13.408300 * Date/Time: 1985-01-21T00:00:00 * Elevation: -230.0 m * Penetration: 0.26 m * Recovery: 0.26 m * Location: Kapp Norvegia * Campaign: ANT-III/3 (PS06 SIBEX) * Basis: Polarstern * Device: Giant box corer (GKG)
PS1367-2 (PS08/333) * Latitude: -72.333330 * Longitude: -16.500000 * Date/Time: 1985-12-18T23:15:00 * Elevation: -307.0 m * Penetration: 2.7 m * Recovery: 2.38 m * Location: Camp Norway * Campaign: ANT-IV/3 (PS08) * Basis: Polarstern * Device: Gravity corer (Kiel type) (SL) * Comment: 3 core sections: 0-0.38, 0.38-1.38, 1.38-2.38 m
Size:
49 datasets

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Datasets listed in this publication series

  1. Grobe, H; Mackensen, A (1992): Age model of sediment core PS1380-3. https://doi.org/10.1594/PANGAEA.50558
  2. Grobe, H; Mackensen, A (1992): Age model of sediment core PS1388-3. https://doi.org/10.1594/PANGAEA.50556
  3. Grobe, H; Mackensen, A (1992): Age model of sediment core PS1389-3. https://doi.org/10.1594/PANGAEA.57813
  4. Grobe, H; Mackensen, A (1992): Age model of sediment core PS1390-3. https://doi.org/10.1594/PANGAEA.50557
  5. Grobe, H; Mackensen, A (1992): Age model of sediment core PS1392-1. https://doi.org/10.1594/PANGAEA.50563
  6. Grobe, H; Mackensen, A (1992): Age model of sediment core PS1394-4. https://doi.org/10.1594/PANGAEA.50555
  7. Grobe, H; Mackensen, A (1992): Age model of sediment core PS1431-1. https://doi.org/10.1594/PANGAEA.50554
  8. Grobe, H; Mackensen, A (1992): Age model of sediment core PS1479-2. https://doi.org/10.1594/PANGAEA.50552
  9. Grobe, H; Mackensen, A (1992): Age model of sediment core PS1481-3. https://doi.org/10.1594/PANGAEA.50553
  10. Grobe, H; Mackensen, A (1992): Age model of sediment core PS1591-1. https://doi.org/10.1594/PANGAEA.50551
  11. Grobe, H; Mackensen, A (1992): Age model of sediment core PS1640-1. https://doi.org/10.1594/PANGAEA.50550
  12. Grobe, H; Mackensen, A (1992): Age model of sediment core PS1648-1. https://doi.org/10.1594/PANGAEA.50549
  13. Grobe, H; Mackensen, A (1992): Distribution of sand, silt, clay in sediment core PS1386-1. https://doi.org/10.1594/PANGAEA.51604
  14. Grobe, H; Mackensen, A (1992): Distribution of sand, silt, clay in sediment core PS1394-1. https://doi.org/10.1594/PANGAEA.57597
  15. Grobe, H; Mackensen, A (1992): Ice rafted debris (> 2 mm gravel) distribution in sediment core PS1006-1. https://doi.org/10.1594/PANGAEA.50169
  16. Grobe, H; Mackensen, A (1996): Ice rafted debris (> 2 mm gravel) distribution in sediment core PS1367-2. https://doi.org/10.1594/PANGAEA.50176
  17. Grobe, H; Mackensen, A (1992): Ice rafted debris (> 2 mm gravel) distribution in sediment core PS1380-3. https://doi.org/10.1594/PANGAEA.50184
  18. Grobe, H; Mackensen, A (1992): Ice rafted debris (> 2 mm gravel) distribution in sediment core PS1388-3. https://doi.org/10.1594/PANGAEA.50188
  19. Grobe, H; Mackensen, A (1992): Ice rafted debris (> 2 mm gravel) distribution in sediment core PS1389-3. https://doi.org/10.1594/PANGAEA.50189
  20. Grobe, H; Mackensen, A (1992): Ice rafted debris (> 2 mm gravel) distribution in sediment core PS1390-3. https://doi.org/10.1594/PANGAEA.50190
  21. Grobe, H; Mackensen, A (1992): Ice rafted debris (> 2 mm gravel) distribution in sediment core PS1394-4. https://doi.org/10.1594/PANGAEA.50192
  22. Grobe, H; Mackensen, A (1992): Ice rafted debris (> 2 mm gravel) distribution in sediment core PS1431-1. https://doi.org/10.1594/PANGAEA.50195
  23. Grobe, H; Mackensen, A (1992): Ice rafted debris (> 2 mm gravel) distribution in sediment core PS1479-1. https://doi.org/10.1594/PANGAEA.50200
  24. Grobe, H; Mackensen, A (1992): Ice rafted debris (> 2 mm gravel) distribution in sediment core PS1479-2. https://doi.org/10.1594/PANGAEA.50201
  25. Grobe, H; Mackensen, A (1992): Ice rafted debris (> 2 mm gravel) distribution in sediment core PS1591-1. https://doi.org/10.1594/PANGAEA.50211
  26. Grobe, H; Mackensen, A (1992): Ice rafted debris (> 2 mm gravel) distribution in sediment core PS1640-1. https://doi.org/10.1594/PANGAEA.50219
  27. Grobe, H; Mackensen, A (1992): Ice rafted debris (> 2 mm gravel) distribution in sediment core PS1648-1. https://doi.org/10.1594/PANGAEA.50220
  28. Grobe, H; Mackensen, A (1992): Paleomagnetic measurements on sediment core PS1390-3. https://doi.org/10.1594/PANGAEA.51318
  29. Grobe, H; Mackensen, A (1992): Sedimentology of core PS1006-1. https://doi.org/10.1594/PANGAEA.56839
  30. Grobe, H; Mackensen, A (1992): Sedimentology of core PS1265-1. https://doi.org/10.1594/PANGAEA.51536
  31. Grobe, H; Mackensen, A (1996): Sedimentology of core PS1367-2. https://doi.org/10.1594/PANGAEA.51578
  32. Grobe, H; Mackensen, A (1992): Sedimentology of core PS1380-3. https://doi.org/10.1594/PANGAEA.51598
  33. Grobe, H; Mackensen, A (1992): Sedimentology of core PS1385-3. https://doi.org/10.1594/PANGAEA.51603
  34. Grobe, H; Mackensen, A (1992): Sedimentology of core PS1386-2. https://doi.org/10.1594/PANGAEA.51605
  35. Grobe, H; Mackensen, A (1992): Sedimentology of core PS1388-1. https://doi.org/10.1594/PANGAEA.51608
  36. Grobe, H; Mackensen, A (1992): Sedimentology of core PS1388-3. https://doi.org/10.1594/PANGAEA.51609
  37. Grobe, H; Mackensen, A (1992): Sedimentology of core PS1389-3. https://doi.org/10.1594/PANGAEA.51624
  38. Grobe, H; Mackensen, A (1992): Sedimentology of core PS1390-3. https://doi.org/10.1594/PANGAEA.51626
  39. Grobe, H; Mackensen, A (1992): Sedimentology of core PS1394-4. https://doi.org/10.1594/PANGAEA.51630
  40. Grobe, H; Mackensen, A (1992): Sedimentology of core PS1431-1. https://doi.org/10.1594/PANGAEA.51508
  41. Grobe, H; Mackensen, A (1992): Sedimentology of core PS1479-1. https://doi.org/10.1594/PANGAEA.51658
  42. Grobe, H; Mackensen, A (1992): Sedimentology of core PS1479-2. https://doi.org/10.1594/PANGAEA.51659
  43. Grobe, H; Mackensen, A (1992): Sedimentology of core PS1640-1. https://doi.org/10.1594/PANGAEA.51689
  44. Grobe, H; Mackensen, A (1992): Sedimentology of core PS1640-2. https://doi.org/10.1594/PANGAEA.51690
  45. Grobe, H; Mackensen, A (1992): Sedimentology of core PS1648-1. https://doi.org/10.1594/PANGAEA.51692
  46. Grobe, H; Mackensen, A (1992): Water and carbon content of sediment core PS1380-1. https://doi.org/10.1594/PANGAEA.51597
  47. Grobe, H; Mackensen, A (1992): Water and carbon content of sediment core PS1389-1. https://doi.org/10.1594/PANGAEA.51623
  48. Grobe, H; Mackensen, A (1992): Water and carbon content of sediment core PS1390-1. https://doi.org/10.1594/PANGAEA.51625
  49. Grobe, H; Mackensen, A (1992): Water and carbon content of sediment core PS1394-1. https://doi.org/10.1594/PANGAEA.51629