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Beveridge, N; Elderfield, Henry; Shackleton, Nicholas J (1995): Deep thermohaline Circulation in the low-latitude Atlantic during the Last Glacial. PANGAEA, https://doi.org/10.1594/PANGAEA.692007, Supplement to: Beveridge, N et al. (1995): Deep thermohaline circulation in the low-latitude Atlantic during the last glacial. Paleoceanography, 10(3), 643-660, https://doi.org/10.1029/94PA03353

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Abstract:
Present-day low-latitude eastern and western Atlantic basins are geochemically distinct below the sill depth of the Mid-Atlantic Ridge. While Antarctic Bottom Water (AABW) circulates freely in the western Atlantic, flow into the eastern Atlantic is restricted below 4 km which results in filling the abyssal depths of this basin with water of geochemical similarity to nutrient depleted North Atlantic Deep Water. Using carbon isotopes and Cd/Ca ratios in benthic foraminifera we reconstruct the geochemistry of these basins during the last glacial maximum. Results indicate that deep eastern and western Atlantic basins became geochemically identical during the last glacial. This was achieved by shoaling of the upper surface of AABW above the sill depth of the Mid-Atlantic Ridge, which allowed bottom waters in both basins to be filled with the same water mass. Although AABW became the dominant water mass in the deep eastern Atlantic basin during the glacial, Holocene-glacial delta13C-PO4 shifts in this basin are in Redfield proportions, unlike the disproportionate Holocene-glacial delta13C-PO4 shifts observed in the Southern Ocean. By examining the composition of deep and intermediate waters throughout the Atlantic, we show that this effect was induced by a change in gradient of the delta13C-PO4 deepwater mixing line during glacial times. Evidence from high-latitude planktonic data suggests that the change in gradient of the deepwater mixing line was brought about through a significant reduction in the thermodynamic effect on Southern Ocean surface waters. By using coupled delta13C-PO4 data to constrain the composition of end member water masses in the glacial Atlantic, we conclude that deep waters in the low-latitude glacial Atlantic were composed of a mixture of northern and southern source waters in a ratio of 1:3.
Coverage:
Median Latitude: 21.474670 * Median Longitude: -20.578937 * South-bound Latitude: 18.997900 * West-bound Longitude: -22.762000 * North-bound Latitude: 24.615000 * East-bound Longitude: -18.573333
Date/Time Start: 1971-11-08T00:00:00 * Date/Time End: 1990-10-17T00:00:00
Event(s):
BOFS26/6K (BOFS26#6) * Latitude: 24.450300 * Longitude: -19.836600 * Date/Time: 1990-10-08T00:00:00 * Elevation: -3680.0 m * Location: Northeast Atlantic * Campaign: CD53 * Basis: Charles Darwin * Method/Device: Kasten corer (KAL) * Comment: BOFS-ID 18175
BOFS28/3K (BOFS28#3) * Latitude: 24.615000 * Longitude: -22.762000 * Date/Time: 1990-10-11T00:00:00 * Elevation: -4900.0 m * Location: Northeast Atlantic * Campaign: CD53 * Basis: Charles Darwin * Method/Device: Kasten corer (KAL) * Comment: BOFS-ID 18295
BOFS29/1K (BOFS29#1) * Latitude: 20.516900 * Longitude: -21.116800 * Date/Time: 1990-10-13T00:00:00 * Elevation: -4000.0 m * Location: Northeast Atlantic * Campaign: CD53 * Basis: Charles Darwin * Method/Device: Kasten corer (KAL) * Comment: BOFS-ID 18372
Size:
10 datasets

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Datasets listed in this publication series

  1. Beveridge, N; Elderfield, H; Shackleton, NJ (1995): (TAble 3d) Stable isotope analysis on sediment core BOFS28/3M. https://doi.org/10.1594/PANGAEA.59503
  2. Beveridge, N; Elderfield, H; Shackleton, NJ (1995): (Table 3a) Cadmium/Calcium ratio of Cibicidoides wuellerstorfi from sediment core GIK12328-5. https://doi.org/10.1594/PANGAEA.194780
  3. Beveridge, N; Elderfield, H; Shackleton, NJ (1995): (Table 3a) Stable isotope analysis on sediment core GIK12328-5. https://doi.org/10.1594/PANGAEA.59508
  4. Beveridge, N; Elderfield, H; Shackleton, NJ (1995): (Table 3b) Cadmium/Calcium ratio of Cibicidoides wuellerstorfi from sediment core BOFS31/1K. https://doi.org/10.1594/PANGAEA.194779
  5. Beveridge, N; Elderfield, H; Shackleton, NJ (1995): (Table 3b) Stable isotope analysis on sediment core BOFS31/1K. https://doi.org/10.1594/PANGAEA.59507
  6. Beveridge, N; Elderfield, H; Shackleton, NJ (1995): (Table 3c) Cadmium/Calcium ratio of Cibicidoides wuellerstorfi from sediment core BOFS29/1K. https://doi.org/10.1594/PANGAEA.194778
  7. Beveridge, N; Elderfield, H; Shackleton, NJ (1995): (Table 3c) Stable isotope analysis on sediment core BOFS29/1K. https://doi.org/10.1594/PANGAEA.59504
  8. Beveridge, N; Elderfield, H; Shackleton, NJ (1995): (Table 3d) Cadmium/Calcium ratio of Cibicidoides wuellerstorfi from sediment core BOFS28/3M. https://doi.org/10.1594/PANGAEA.194777
  9. Beveridge, N; Elderfield, H; Shackleton, NJ (1995): (Table 3e) Stable isotope analysis on sediment core BOFS30/3K. https://doi.org/10.1594/PANGAEA.59505
  10. Beveridge, N; Elderfield, H; Shackleton, NJ (1995): (Table 3f) Stable isotope analysis on sediment core BOFS26/6K. https://doi.org/10.1594/PANGAEA.59502