Khélifi, Nabil; Sarnthein, Michael; Andersen, Nils; Blanz, Thomas; Frank, Martin; Garbe-Schönberg, Carl-Dieter; Haley, Brian A; Stumpf, Rick; Weinelt, Mara (2009): Stable isotope ratios and paleoceanaographic reconstructions from sediment cores 80-548 and 161-978A. PANGAEA, https://doi.org/10.1594/PANGAEA.716848, Supplement to: Khélifi, N et al. (2009): A major and long-term Pliocene intensification of the Mediterranean Outflow, 3.5 – 3.3 Ma ago. Geology, 37(9), 811-814, https://doi.org/10.1130/G30058A.1
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Largely continuous millennial-scale records of benthic d18O, Mg/Ca-based temperature, and salinity variations in bottom waters were obtained from Deep Sea Drilling Project Site 548 (eastern Atlantic continental margin south of Ireland, 1250 m water depth) for the period between 3.7 and 3.0 million years ago. This site monitored mid-Pliocene changes in Mediterranean Outflow Water (MOW) documented by continuously high Nd values between -10.7 and -9. Site 978 (Alboran Sea, 1930 m water depth) provides a complementary record of bottom water variability in the westernmost Mediterranean Sea, which is taken to represent MOW composition at its source. Both sites are marked by a singular and persistent rise in bottom water salinities by 0.7-1.4 psu and in densities by ~1 kg m-3 from 3.5 to 3.3 Ma, which is matched by an average 3 °C increase in bottom water temperatures at Site 548. This event suggests the onset of strongly enhanced deep-water convection in the Mediterranean Sea and a related strengthened MOW flow, which implies a major aridification of the Mediterranean source region. In harmony with model suggestions, the enhanced MOW flow has possibly intensified Upper North Atlantic Deep Water formation.
Median Latitude: 42.573450 * Median Longitude: -7.110475 * South-bound Latitude: 36.231100 * West-bound Longitude: -12.164000 * North-bound Latitude: 48.915800 * East-bound Longitude: -2.056950
Date/Time Start: 1981-06-10T00:00:00 * Date/Time End: 1995-06-21T02:30:00
161-978A * Latitude: 36.231100 * Longitude: -2.056950 * Date/Time Start: 1995-06-15T16:00:00 * Date/Time End: 1995-06-21T02:30:00 * Elevation: -1929.0 m * Penetration: 698 m * Recovery: 406.66 m * Location: Alboran Sea * Campaign: Leg161 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 53 cores; 504.2 m cored; 0 m drilled; 80.7 % recovery
80-548 * Latitude: 48.915800 * Longitude: -12.164000 * Date/Time: 1981-06-10T00:00:00 * Elevation: -1251.0 m * Penetration: 211 m * Recovery: 210.2 m * Location: North Atlantic/SPUR * Campaign: Leg80 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 35 cores; 211 m cored; 0 m drilled; 99.6 % recovery
Datasets listed in this publication series
- Khélifi, N; Sarnthein, M; Andersen, N et al. (2009): Table 1. Planktic δ¹⁸O, epibenthic d18O and δ¹³C, Mg/Ca-based bottom water temperature, d18O and density, and seawater Nd isotope compositions from ODP Hole 978A. https://doi.org/10.1594/PANGAEA.716846
- Khélifi, N; Sarnthein, M; Andersen, N et al. (2009): Table 2. Planktic δ¹⁸O, epibenthic d18O and δ¹³C, Mg/Ca-based bottom water temperature, d18O and density, and seawater Nd isotope compositions from DSDP Hole 548. https://doi.org/10.1594/PANGAEA.716847