Lochte, Annalena Antonia; Schneider, Ralph R (2022): Age model of sediment core MSM45/19_2 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.945717
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Abstract:
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 ± 38 years between 703 and 1033 cm depth. The larger component of Baffin Bay sourced Arctic waters contributing to the LC must have resulted in an even higher reservoir effect, because of the poor ventilation of polar waters with a perennial sea-ice cover (Austin et al., 1995). In order to maintain nearly continuous sedimentation rates, we applied a ΔR of 644 ± 38 years to the radiocarbon dates between 1043 and 1303 cm depth. An early Holocene reservoir correction of this order is further corroborated by the independent estimate of R = 880–1000 years (ΔR = 480–600 years) using the 14C-Plateau dating method for Arctic waters from the Barent Shelf south of Svalbard (Sarnthein and Werner, 2017). Dates are reported in calibrated years BP (before present).
Related to:
Lochte, Annalena Antonia; Repschläger, Janne; Kienast, Markus; Garbe-Schönberg, Dieter; Andersen, Nils; Hamann, Christian; Schneider, Ralph R (2019): Labrador Sea freshening at 8.5 ka BP caused by Hudson Bay Ice Saddle collapse. Nature Communications, 10(1), https://doi.org/10.1038/s41467-019-08408-6
Further details:
Austin, William EN; Bard, Edouard; Hunt, John B; Kroon, Dick; Peacock, J D (1995): The 14C Age of the Icelandic Vedde Ash: Implications for Younger Dryas Marine Reservoir Age Corrections. Radiocarbon, 37(1), 53-62, https://doi.org/10.1017/S0033822200014788
Bard, Edouard; Arnold, Maurice; Mangerud, Jan; Paterne, Martine; Labeyrie, Laurent D; Duprat, Josette M; Mélières, Marie-Antoinette; Sonstegaard, E; Duplessy, Jean-Claude (1994): The North Atlantik atmosphere-sea surface 14C gradient during the Younger Dryas climatic event. Earth and Planetary Science Letters, 126(4), 275-287, https://doi.org/10.1016/0012-821X(94)90112-0
Carlson, Anders Eskil; LeGrande, Allegra N; Oppo, Delia W; Came, Rosemarie E; Schmidt, Gavin A; Anslow, Faron S; Licciardi, Joseph M; Obbink, Elizabeth A (2008): Rapid early Holocene deglaciation of the Laurentide ice sheet. Nature Geoscience, 1(9), 620-624, https://doi.org/10.1038/ngeo285
Lewis, C F M; Miller, A A L; Levac, Elisabeth; Piper, David J W; Sonnichsen, G V (2012): Lake Agassiz outburst age and routing by Labrador Current and the 8.2 cal ka cold event. Quaternary International, 260, 83-97, https://doi.org/10.1016/j.quaint.2011.08.023
Rashid, Harunur; Piper, David J W; Lazar, Kelly B; McDonald, Kieran; Saint-Ange, Francky (2017): The Holocene Labrador Current: Changing linkages to atmospheric and oceanographic forcing factors. Paleoceanography, 32(5), 498-510, https://doi.org/10.1002/2016PA003051
Sarnthein, Michael; Werner, Kirstin (2017): Early Holocene planktic foraminifers record species-specific 14C reservoir ages in Arctic Gateway. Marine Micropaleontology, 135, 45-55, https://doi.org/10.1016/j.marmicro.2017.07.002
Stuiver, Minze; Reimer, Paula J (1993): Extended 14C data base and revised CALIB 3.0 14C age calibration program. Radiocarbon, 35(1), 215-230, https://doi.org/10.1017/S0033822200013904
Stuiver, Minze; Reimer, Paula J; Reimer, Ron W (2017): CALIB 7.1 [WWW program] at http://calib.org. Accessed 15 June 2017. http://calib.org
Funding:
GEOMAR - Helmholtz Centre for Ocean Research Kiel (GEOMAR), grant/award no. VH-KO-601: Helmholtz Research School on Ocean System Science and Technology
Coverage:
Latitude: 58.761330 * Longitude: -61.937500
Date/Time Start: 2015-08-10T18:20:00 * Date/Time End: 2015-08-10T18:20:00
Minimum DEPTH, sediment/rock: 0.03 m * Maximum DEPTH, sediment/rock: 13.03 m
Event(s):
MSM45_418-2 (MSM45-19-2) * Latitude: 58.761330 * Longitude: -61.937500 * Date/Time: 2015-08-10T18:20:00 * Elevation: -201.8 m * Location: Labrador Sea * Campaign: MSM45 * Basis: Maria S. Merian * Method/Device: Gravity corer (GC)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Lochte, Annalena Antonia | Geocode | |
| 2 | Calendar age | Cal age | ka BP | Lochte, Annalena Antonia | Age, 14C calibrated |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
21 data points