Age model of sediment core MSM45/19_2

• Main Authors: Lochte, Annalena Antonia, Schneider, Ralph R
• Format: Dataset
• Language: English
• Published: PANGAEA 2022
• Subjects: 8.2 ka event; Age; 14C calibrated; Age model; Calendar age; DEPTH; sediment/rock; GC; Gravity corer; Holocene; Labrador Sea; Maria S. Merian; MSM45; MSM45_418-2; MSM45-19-2; radiocarbon age model; Arctic; Ice Sheet; Northwest Atlantic; Sea ice
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.945717; https://doi.org/10.1594/PANGAEA.945717

The presented data originates from the 1306cm long gravity core MSM45-19-2 (58°45.68 N, 61°56.25 W, 202m water depth) taken during R/V Maria S. Merian cruise MSM45 in August 2015 at 202 m water depth on the northern Labrador Shelf, northeast Canada, northwest Atlantic. Radiocarbon dating was done to secure the chorology of core MSM45-19-2 for further palaeoceanographic interpretations. The chronology of core MSM45-19-2 is based on linear interpolation of the calibrated (median probability)14C AMS ages. The sedimentation rate varies between 0.037 and 1.22 cm per year and decreases toward the top of the core, which may be related to stronger current activity during the late Holocene leading to winnowing of fine particles (e.g. Rashid et al., 2017) or a shift of the sediment deposition center toward the outer shelf after sea-level high stand was reached. In addition, decreased glacial meltwater runoff after 7 ka BP corresponding to the end of significant Laurentide Ice Sheet melting (Carlson et al., 2008) would have led to a diminished terrestrial sediment influx. The upper 500 cm of the core provide an average chronological resolution of ca. 70 yrs per sample, while the lower part of the core from 500 to 1300 cm provides an average chronological resolution of ca. 10 years per sample. 21 AMS 14C measurements which were carried out on mixed calcareous benthic foraminifera at the Leibniz Laboratory of Kiel University (CAU), Germany between 2016 and 2017. Each sample contained over 1000 specimens (about 5mg). The 14C dates were calibrated using Calib 7.1 (Stuiver et al.,2017; Stuiver and Reimer, 1993) and the Marine13 data set (Reimer et al., 2013) applying variable reservoir corrections (ΔR) of 144, 344, and 644 ± 38 years. Based on the modern Labrador Shelf marine radiocarbon correction (McNeely et al., 2006), we applied a ΔR of 144 ± 38 years to the radiocarbon dates between3 and 603 cm depth. An additional early Holocene sea-ice correction of 200 years (Bard et al., 1994; Lewis et al., 2012) led to the ΔR of 344 ± ...