d18O of bulk carbonate from sediment core MD01-2444 on the Portuguese Margin, Marine Isotope Stage 3 ...

• Main Authors: Tzedakis, Polychronis C, Margari, Vasiliki, Skinner, Luke C, Menviel, Laurie, Capron, Emilie, Rhodes, Rachael H, Mleneck-Vautravers, Maryline J, Ezat, Mohamed M, Martrat, Belén, Grimalt, Joan O, Hodell, David A
• Format: Dataset
• Language: English
• Published: PANGAEA 2020
• Subjects: Heinrich Stadials; Interstadials; MIS 3; Portuguese Margin; DEPTH, sediment/rock; Age model; δ18O, bulk carbonate; Calypso Corer; Age model, GICC05; Age model, WD2014; Mass spectrometer MAT-253 ThermoFisher Scientific; MD123; Marion Dufresne 1995; Greenland; ice core; NGRIP
• Online Access: https://dx.doi.org/10.1594/pangaea.919837; https://doi.pangaea.de/10.1594/PANGAEA.919837

Bulk carbonate oxygen isotopes: Oxygen isotopes were measured using a ThermoFisher GasBench II equipped with a CTC Combi-Pal autosampler and interfaced via continuous flow with a ThermoFisher MAT 253 isotope ratio mass spectrometer (IRMS). About 200-300 mg of bulk sample was used. Analytical precision is estimated to be ±0.08% for d18O of an internal standard (Carrara marble).Age model: The age model was developed by aligning the abrupt transitions of d18O record of G. bulloides in core MD01-2444 to warming and cooling events in the NGRIP d18Oice record, presented on: (i) the GICC05 timescale [Svensson, A. et al. A 60,000 year Greenland stratigraphic ice core chronology. Clim. Past 4, 47–57 (2008)]; and (ii) the WD2014: modified timescale, whereby NGRIP GICC05 ice ages 31.2–67.2 ka are multiplied by 1.0063. [Buizert, C. et al. The WAIS Divide deep ice core WD2014 chronology – Part 1: Methane synchronization (68–31 ka BP) and the gas age–ice age difference. Clim. Past 11, 153-173 (2015)]. ...