Wong, Wanyee; Risebrobakken, Bjørg; Ödalen, Malin; Tisserand, Amandine; Fahl, Kirsten; Stein, Ruediger; Jansen, Eystein: Planktonic foraminiferal Mg/Ca results from the eastern Fram Strait between 40 and 33.5 ka b2k [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.980595 (dataset in review)
Abstract:
We present a Neogloboquadrina pachyderma Mg/Ca-subsurface temperature (SubSTs) dataset from marine sediment core MD99-2304, retrieved from the eastern Fram Strait (77°37'15.6N, 9°56'54E) at a water depth of 1348 m. The core was collected using a piston corer during the Marion Dufresne IMAGES 5 expedition (leg MD114) in 1999. This dataset illustrates the subsurface condition in the eastern Fram Strait between 40 and 33.5 ka b2k, covering a period within Marine Isotope Stage 3 (MIS 3). Neogloboquadrina pachyderma specimens were dry-sieved between 150 and 212 μm and handpicked, with a temporal resolution of 20–40 years per sample. The final sampling resolution was determined by the availability of foraminifera in each sample. Trace element analysis was conducted on approximately 100 crushed foraminiferal shells per sample following a "full cleaning" protocol (Boyle, 1981; Boyle & Keigwin, 1985). This protocol involved the removal of clays, metal oxides, and barite, oxidation of organic matter, and surface leaching. Analyses were performed at the Trace Element Lab (TELab) at NORCE Bergen, Norway, using an Agilent 720 Inductively Coupled Plasma Optical Emission Spectrometer (ICP-OES). Measured Mg/Ca ratios showed negligible correlation with Fe/Ca, Al/Ca, and Mn/Ca (r² = 0.003, 0.0067, and 0.002, respectively), confirming that contamination from incomplete cleaning was minimal. Long-term precision, assessed using the ECRM-752-1 carbonate standard, yielded a value of 3.76 mmol/mol (1σ = 0.007 mmol/mol). Mg/Ca(N.p) values were calibrated to SubSTs using the equation from Elderfield & Ganssen (2000): T = 10 × ln(Mg/Ca(N.p) / 0.52).
Supplement to:
Wong, Wanyee; Risebrobakken, Bjørg; Ödalen, Malin; Tisserand, Amandine; Fahl, Kirsten; Stein, Ruediger; Jansen, Eystein (in prep.): Ocean control on sea ice in the Nordic Seas.
Related to:
Boyle, Edward A (1981): Cadmium, zinc, copper, and barium in foraminifera tests. Earth and Planetary Science Letters, 53(1), 11-35, https://doi.org/10.1016/0012-821X(81)90022-4
Boyle, Edward A; Keigwin, Lloyd D (1985): Comparison of Atlantic and Pacific paleochemical records for the last 215.000 years: changes in deep ocean circulation and chemical inventories. Earth and Planetary Science Letters, 76(1-2), 135-150, https://doi.org/10.1016/0012-821X(85)90154-2
Elderfield, Henry; Ganssen, Gerald M (2000): Past temperature and d18O of surface ocean waters inferred from foraminiferal Mg/Ca ratios. Nature, 405(6785), 442-445, https://doi.org/10.1038/35013033
Project(s):
ABRUPT Arctic Climate Change (ABRUPT)
Funding:
Coverage:
Latitude: 77.621067 * Longitude: 9.948333
Date/Time Start: 1999-08-01T00:00:00 * Date/Time End: 1999-08-01T00:00:00
Minimum DEPTH, sediment/rock: 8.1325 m * Maximum DEPTH, sediment/rock: 9.5975 m
Event(s):
MD99-2304 (3280N) * Latitude: 77.621067 * Longitude: 9.948333 * Date/Time: 1999-08-01T00:00:00 * Elevation: -1348.0 m * Recovery: 22.885 m * Location: Spitsbergen slope * Campaign: MD114 (IMAGES V) * Basis: Marion Dufresne (1995) * Method/Device: Calypso Corer (CALYPSO)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Depth, sediment/rock, top/minimum | Depth sed top | m | Wong, Wanyee | ||
| 2 | Depth, sediment/rock, bottom/maximum | Depth sed bot | m | Wong, Wanyee | ||
| 3 | DEPTH, sediment/rock | Depth sed | m | Wong, Wanyee | Geocode | |
| 4 | Depth, corrected | Depth corr | m | Wong, Wanyee | after removing the layer of the turbidte tail | |
| 5 | Age | Age | ka b2k | Wong, Wanyee | ||
| 6 | Neogloboquadrina pachyderma, Magnesium/Calcium ratio | N. pachyderma Mg/Ca | mmol/mol | Wong, Wanyee | ICP-OES (Agilent 720) | |
| 7 | Sub-surface temperature | SubT | °C | Wong, Wanyee | Calculated from Mg/Ca ratios (Elderfield & Ganssen, 2000) |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
1343 data points