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Lebreiro, Susana Martin; Voelker, Antje H L; Vizcaino, Alexis; Abrantes, Fatima F; Alt-Epping, Ulrich; Jung, S; Thouveny, Nicolas; Gràcia, Eulàlia (2009): Analytical results from sediment core MD03-2698 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.733461, Supplement to: Lebreiro, SM et al. (2009): Sediment instability on the Portuguese continental margin under abrupt glacial climate changes (last 60 kyr). Quaternary Science Reviews, 28(27-28), 3211-3223, https://doi.org/10.1016/j.quascirev.2009.08.007

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Published: 2009 (exact date unknown) • DOI registered: 2010-03-08

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Abstract:
It is well established that orbital scale sea-level changes generated larger transport of sediments into the deep-sea during the last glacial maximum than the Holocene. However, the response of sedimentary processes to abrupt millennial-scale climate variability is rather unknown. Frequency of distal turbidites and amounts of advected detrital carbonate are estimated off the Lisbon-Setúbal canyons, within a chronostratigraphy based on radiometric ages, oxygen isotopes and paleomagnetic key global anomalies. We found that:
1) Higher frequency of turbidites concurred with Northern Hemisphere coldest temperatures (Greenland Stadials [GS], including Heinrich [H] events). But more than that, an escalating frequency of turbidites starts with the onset of global sea-level rising (and warming in Antarctica) and culminates during H events, at the time when rising is still in its early-mid stage, and the Atlantic Meridional Overturning Circulation (AMOC) is re-starting. This short time span coincides with maximum gradients of ocean surface and bottom temperatures between GS and Antarctic warmings (Antarctic Isotope Maximum; AIM 17, 14, 12, 8, 4, 2) and rapid sea-level rises.
2) Trigger of turbidity currents is not the only sedimentary process responding to millennial variability; land-detrital carbonate (with a very negative bulk d18O signature) enters the deep-sea by density-driven slope lateral advection, accordingly during GS.
3) Possible mechanisms to create slope instability on the Portuguese continental margin are sea-level variations as small as 20 m, and slope friction by rapid deep and intermediate re-accommodation of water masses circulation.
4) Common forcing mechanisms appear to drive slope instability at both millennial and orbital scales.
Project(s):
International Marine Global Change Study (IMAGES)
Coverage:
Latitude: 38.239500 * Longitude: -10.390300
Date/Time Start: 2003-07-15T00:00:00 * Date/Time End: 2003-07-15T00:00:00
Event(s):
MD03-2698 * Latitude: 38.239500 * Longitude: -10.390300 * Date/Time: 2003-07-15T00:00:00 * Elevation: -4602.0 m * Recovery: 35.43 m * Location: Tagus-Sado canyon system * Campaign: MD134 (PICABIA) * Basis: Marion Dufresne (1995) * Method/Device: Calypso Corer (CALYPSO)
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
11 datasets

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Datasets listed in this publication series

  1. Lebreiro, SM; Voelker, AHL; Vizcaino, A et al. (2009): (Table 1) AMS 14C measurements in sediment core MD03-2698. https://doi.org/10.1594/PANGAEA.733491
  2. Lebreiro, SM; Voelker, AHL; Vizcaino, A et al. (2009): (Table 1) Age model of sediment core MD03-2698. https://doi.org/10.1594/PANGAEA.733440
  3. Lebreiro, SM; Voelker, AHL; Vizcaino, A et al. (2009): (Figure 5) Stable oxygen isotope ratios on bulk carbonate of sediment core MD03-2698. https://doi.org/10.1594/PANGAEA.733457
  4. Lebreiro, SM; Voelker, AHL; Vizcaino, A et al. (2009): (Figure 5) Calcium carbonate content of sediment core MD03-2698. https://doi.org/10.1594/PANGAEA.733459
  5. Lebreiro, SM; Voelker, AHL; Vizcaino, A et al. (2009): (Table 1) Calculated ages of sediment core MD03-2698. https://doi.org/10.1594/PANGAEA.733444
  6. Lebreiro, SM; Voelker, AHL; Vizcaino, A et al. (2009): (Figure 5) Stable isotope ratios on Cibicidoides sp. from sediment core MD03-2698. https://doi.org/10.1594/PANGAEA.733460
  7. Lebreiro, SM; Voelker, AHL; Vizcaino, A et al. (2009): (Figure 2) Stable isotope ratios measured on G. bulloides from sediment core MD03-2698. https://doi.org/10.1594/PANGAEA.733445
  8. Lebreiro, SM; Voelker, AHL; Vizcaino, A et al. (2009): (Figure 2) NRM and ARM intensities of sediment core MD03-2698. https://doi.org/10.1594/PANGAEA.733452
  9. Lebreiro, SM; Voelker, AHL; Vizcaino, A et al. (2009): (Figure 4) Magnetic susceptibility of sediment core MD03-2698. https://doi.org/10.1594/PANGAEA.733456
  10. Lebreiro, SM; Voelker, AHL; Vizcaino, A et al. (2009): (Figure 4) Turbidite occurrence in sediment core MD03-2698. https://doi.org/10.1594/PANGAEA.733453
  11. Lebreiro, SM; Voelker, AHL; Vizcaino, A et al. (2009): (Figure 4) Geochemical raw data of sediment core MD03-2698. https://doi.org/10.1594/PANGAEA.733454