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Khélifi, Nabil; Sarnthein, Michael; Frank, Martin; Andersen, Nils; Garbe-Schönberg, Carl-Dieter (2014): Late Pliocene variations of the Mediterranean outflow. PANGAEA, https://doi.org/10.1594/PANGAEA.863957, Supplement to: Khélifi, N et al. (2014): Late Pliocene variations of the Mediterranean outflow. Marine Geology, 357, 182-194, https://doi.org/10.1016/j.margeo.2014.07.006

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Abstract:
Late Pliocene changes in the advection of Mediterranean Outflow Water (MOW) derivates were reconstructed at northeast Atlantic DSDP/ODP sites 548 and 982 and compared to records of WMDW at West Mediterranean Site 978. Neodymium isotope (epsilon-Nd) values more positive than ~10.5/~ 11 reflect diluted MOW derivates that spread almost continuously into the northeast Atlantic from 3.7 to 2.55 Ma, reaching Rockall Plateau Site 982 from 3.63 to 2.75 Ma. From 3.4 to 3.3 Ma average MOW temperature and salinity increased by 2°-4 °C and ~1 psu both at proximal Site 548 and distal Site 982. The rise implies a rise in flow strength, coeval with a long-term rise in both west Mediterranean Sea surface salinity by almost 2 psu and average bottom water salinity (BWS) by ~1 psu, despite inherent uncertainties in BWS estimates. The changes were linked with major Mediterranean aridification and a drop in African monsoon humidity. In contrast to model expectations, the rise in MOW salt discharge after 3.4 Ma did not translate into improved ventilation of North Atlantic Deep Water, since it possibly was too small to significantly influence Atlantic Meridional Overturning Circulation. Right after ~2.95 Ma, with the onset of major Northern Hemisphere Glaciation, long-term average bottom water temperature (BWT) and BWS at Site 548 dropped abruptly by ~5 °C and ~1-2 psu, in contrast to more distal Site 982, where BWT and BWS continued to oscillate at estimates of ~2 °C and 1.5-2.5 psu higher than today until ~2.6 Ma. We relate the small-scale changes both to a reduced MOW flow and to enhanced dilution by warm waters of a strengthened North Atlantic Current temporarily replacing MOW derivates at Rockall Plateau.
Coverage:
Median Latitude: 46.128040 * Median Longitude: -9.101561 * South-bound Latitude: 36.031700 * West-bound Longitude: -15.854183 * North-bound Latitude: 57.516700 * East-bound Longitude: -1.955280
Date/Time Start: 1981-06-10T00:00:00 * Date/Time End: 1995-07-19T02:25:00
Size:
15 datasets

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Datasets listed in this publication series

  1. Khélifi, N; Sarnthein, M; Frank, M et al. (2014): Bottom water temperature, salinity and δ¹⁸O reconstruction based on benthic foraminifera stable oxygen isotopes of ODP Hole 161-978A. https://doi.org/10.1594/PANGAEA.863947
  2. Khélifi, N; Sarnthein, M; Frank, M et al. (2014): Mg/Ca ratios of Cibicidoides mundulus and BWT reconstruction of DSDP Hole 80-548. https://doi.org/10.1594/PANGAEA.863952
  3. Khélifi, N; Sarnthein, M; Frank, M et al. (2014): Mg/Ca ratios of Cibicidoides mundulus and BWT reconstruction of ODP Hole 161-978A. https://doi.org/10.1594/PANGAEA.863950
  4. Khélifi, N; Sarnthein, M; Frank, M et al. (2014): Mg/Ca ratios of Cibicidoides mundulus and BWT reconstruction of ODP Site 162-982. https://doi.org/10.1594/PANGAEA.863951
  5. Khélifi, N; Sarnthein, M; Frank, M et al. (2014): Mg/Ca ratios of Neogloboquadrina atlantica (s) and SST reconstruction of ODP Hole 162-982. https://doi.org/10.1594/PANGAEA.863949
  6. Khélifi, N; Sarnthein, M; Frank, M et al. (2014): Nd-iostope composition of DSDP Hole 80-548. https://doi.org/10.1594/PANGAEA.863934
  7. Khélifi, N; Sarnthein, M; Frank, M et al. (2014): Nd-iostope composition of ODP Holes 161-977A and 161-978A. https://doi.org/10.1594/PANGAEA.863936
  8. Khélifi, N; Sarnthein, M; Frank, M et al. (2014): Nd-iostope composition of ODP Site 162-982. https://doi.org/10.1594/PANGAEA.863935
  9. Khélifi, N; Sarnthein, M; Frank, M et al. (2014): Stable isotopic composition of Cibicidoides wuellerstorf of ODP Hole 161-978A. https://doi.org/10.1594/PANGAEA.863938
  10. Khélifi, N; Sarnthein, M; Frank, M et al. (2014): Stable isotopic composition of benthic foraminifera of DSDP Hole 80-548. https://doi.org/10.1594/PANGAEA.863940
  11. Khélifi, N; Sarnthein, M; Frank, M et al. (2014): Stable isotopic composition of benthic foraminifera of ODP Hole 162-982B. https://doi.org/10.1594/PANGAEA.863941
  12. Khélifi, N; Sarnthein, M; Frank, M et al. (2014): Stable isotopic composition of planktonic foraminifera of ODP Hole 161-978A. https://doi.org/10.1594/PANGAEA.863942
  13. Khélifi, N; Sarnthein, M; Frank, M et al. (2014): Stable isotopic composition of planktonic foraminifera of ODP Hole 80-548. https://doi.org/10.1594/PANGAEA.863945
  14. Khélifi, N; Sarnthein, M; Frank, M et al. (2014): UK'37 and temperature reconstruction for ODP Hole 161-978A. https://doi.org/10.1594/PANGAEA.863960
  15. Khélifi, N (2010): Mg/Ca ratios of Cibicidoides wuellerstorfi and BWT reconstruction of DSDP Hole 80-548. https://doi.org/10.1594/PANGAEA.863956