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Weldeab, Syee; Friedrich, Tobias; Timmermann, Axel; Schneider, Ralph R (2016): Benthic foraminiferal multiproxy record of sediment core MD03-2707 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.877253, Supplement to: Weldeab, S et al. (2016): Strong middepth warming and weak radiocarbon imprints in the equatorial Atlantic during Heinrich 1 and Younger Dryas. Paleoceanography, 31(8), 1070-1082, https://doi.org/10.1002/2016PA002957

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Abstract:
We present a benthic foraminiferal multiproxy record of eastern equatorial Atlantic (EEA) middepth water (1295 m) covering the last deglacial. We show that EEA middepth water temperatures were elevated by 3.9 ± 0.5°C and 5.2 ± 1.2°C during Heinrich event 1 (H1) and Younger Dryas (YD), respectively. The radiocarbon content of the EEA middepth during H1 and YD is relatively low and comparable to the values of the pre-H1 episode and Bølling-Allerød, respectively. A transient Earth system model simulation, which mimics the observed deglacial Atlantic Meridional Overturning Circulation (AMOC) history, qualitatively reproduces the major features of the EEA proxy records. The simulation results suggest that fresh water-induced weakening of the AMOC leads to a vertical shift of the horizon of Southern Ocean-sourced water and a stronger influence of EEA sea surface temperatures via mixing. Our findings reaffirm the lack of a distinctive signature of radiocarbon depletion and therefore do not support the notion of interhemispheric exchanges of strongly radiocarbon-depleted middepth water across the tropical Atlantic during H1 and YD. Our temperature reconstruction presents a critical zonal and water depth extension of existing tropical Atlantic data and documents a large-scale and basin-wide warming across the thermocline and middepth of the tropical Atlantic during H1 and YD. Significant difference in the timing and pace of H1 middepth warming between tropical Atlantic and North Atlantic likely points to a limited role of the tropical Atlantic middepth warming in the rapid heat buildup in the North Atlantic middepth.
Coverage:
Latitude: 2.502000 * Longitude: 9.395000
Event(s):
MD03-2707 * Latitude: 2.502000 * Longitude: 9.395000 * Elevation: -1295.0 m * Method/Device: Piston corer (PC)
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
4 datasets

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Datasets listed in this publication series

  1. Weldeab, S; Friedrich, T; Timmermann, A et al. (2016): Mg/Ca analyzed in Golobulimina spp., and Mg/Ca-based estimates of bottom water temperature for sediment core MD03-2707. https://doi.org/10.1594/PANGAEA.877250
  2. Weldeab, S; Friedrich, T; Timmermann, A et al. (2016): Ba/Ca, δ¹³C, and δ¹⁸O analyzed in Cibicides pachyderma of sediment core MD03-2707. https://doi.org/10.1594/PANGAEA.877249
  3. Weldeab, S; Friedrich, T; Timmermann, A et al. (2016): 14C age of benthic foraminifer, calculated D14C content of the bottom water, and its deviation from that of the atmosphere, sediment core MD03-2707. https://doi.org/10.1594/PANGAEA.877252
  4. Weldeab, S; Friedrich, T; Timmermann, A et al. (2016): Estimated of δ¹⁸O of bottom water based on Mg/Ca-based temperature estimates and d18O measurement in Cibicides pachderma of sediment core MD03-2707. https://doi.org/10.1594/PANGAEA.877251