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Spielhagen, Robert F; Mackensen, Andreas (2021): Coarse fraction and planktic stable isotope data from sediment core PS93/031-5 (NW Fram Strait). PANGAEA, https://doi.org/10.1594/PANGAEA.930316, In: Spielhagen, RF; Mackensen, A (2021): Coarse fraction, radiocarbon datings, and planktic stable isotope data from sediment core PS93/031-5 (NW Fram Strait). PANGAEA, https://doi.org/10.1594/PANGAEA.930425

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Abstract:
The coarse fraction content and the oxygen and carbon isotopic compositions of two morphotyes of planktic foraminifers Neogloboquadrina pachyderma were determined from sediment samples obtained from sediment core PS93/031-5. The age model is based on 9 radiocarbon datings obtained on ~2000 specimens of N. pachyderma each.
Grain size measurements occurred in May-July 2017. Stable isotope measurements were performed in August 2018 to February 2019. According to radiocarbon datings (https://doi.pangaea.de/10.1594/PANGAEA.930416) converted to calibrated years with the program Calib 8.2 (http://calib.org/calib/), using the IntCal20 data set and applying a reservoir correction of 550 years), the core covers the interval of 3,750-23,230 years before present, with the hiatus covering the interval 12,660-18,550 years.
Sediment core PS93/031-5 was obtained during RV POLARSTERN expedition PS93.1 in the northwestern Fram Strait on the Northeast Greenland continental margin from 2,135 m water depth.
The data were collected to reconstruct the Late Quaternary paleoenvironment in the northwestern Fram Strait, the glacial history of the northeast Greenland shelf, and the export of freshwater from the Arctic to the North Atlantic in the last ca. 21,000 years.
Sediment slices of approx. 5 mm thickness were taken from sediment core PS93/031-5 every 0.5 cm (~30 g dry sediment per sample). Sediments were freeze-dried, weighed, and washed with deionized water through a 63 µm mesh. The remaining coarse fraction was dried at 50°C and weighed. Coarse fraction percentages were calculated as [coarse fraction weight] * 100 / [dry bulk weight].
Planktic foraminifers Neogloboquadrina pachyderma were hand-picked from the 100-250 µm fraction for stable isotope measurements. 25 specimens of morphotypes 1 and 2 as well as 40 specimens of morphotypes 4 and 5 (following the morphotype concept of Eynaud, 2011) were analyzed separately for stable oxygen and carbon isotope compositions (δ18O, δ13C) in the stable isotope lab of AWI on a Finnigan MAT 253 gas mass spectrometer coupled to the automatic carbonate preparation device Kiel IV. The mass spectrometer was calibrated via international standard NBS19 to the PDB scale. Results are given in δ-notation vs. VPDB. Details on ice volume effect corrections and calculations of differences to oxygen isotope values of equilibrium calcite (δ18Oec) are given in Spielhagen and Mackensen (under review).
Keyword(s):
coarse fraction; Fram Strait; isotopes; Neogloboquadrina pachyderma; Quaternary
Related to:
Eynaud, Frédérique (2011): Planktonic foraminifera in the Arctic: a paleoceanographic view. IOP Conference Series: Earth and Environmental Science, 14, 1-12, https://doi.org/10.1088/1755-1315/14/1/012005
Funding:
Federal Ministry of Education and Research (BMBF), grant/award no. 03G0833C: System Laptev-Sea: Transdrift
Federal Ministry of Education and Research (BMBF), grant/award no. 03G0833D: System Laptev-Sea: Transdrift / Laptev-Sea Transdrift
German Science Foundation (DFG), grant/award no. DFG SP 526/5-1: Environmental and Climate History Off NorthEast Greenland
Coverage:
Latitude: 79.349500 * Longitude: -3.523830
Date/Time Start: 2015-07-09T16:50:00 * Date/Time End: 2015-07-09T16:50:00
Minimum DEPTH, sediment/rock: 0.0025 m * Maximum DEPTH, sediment/rock: 0.3725 m
Event(s):
PS93/031-5 * Latitude: 79.349500 * Longitude: -3.523830 * Date/Time: 2015-07-09T16:50:00 * Elevation: -2134.5 m * Location: North Greenland Sea * Campaign: PS93.1 (ARK-XXIX/2.1) * Basis: Polarstern * Method/Device: Giant box corer (GKG)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DEPTH, sediment/rockDepthmSpielhagen, Robert FGeocode
2AGEAgeka BPSpielhagen, Robert FAge, 14C calibrated, CALIB 8.2 and IntCal20Geocode – 550 yr reservoir correction
3Size fraction > 0.063 mm, sand>63 µm%Spielhagen, Robert Fcoarse fraction
4Neogloboquadrina pachyderma, δ18ON. pachyderma δ18O‰ PDBSpielhagen, Robert FMass spectrometer Finnigan MAT 253 coupled to a KIEL IV carbonate preparation deviceMorphotype Np1-2; size fraction 100-250 µm
5Neogloboquadrina pachyderma, δ18O standard deviationN. pachyderma δ18O std dev±Spielhagen, Robert FMass spectrometer Finnigan MAT 253 coupled to a KIEL IV carbonate preparation deviceMorphotype Np1-2
6Neogloboquadrina pachyderma, δ18ON. pachyderma δ18O‰ PDBSpielhagen, Robert FMass spectrometer Finnigan MAT 253 coupled to a KIEL IV carbonate preparation deviceMorphotype Np4-5; size fraction 100-250 µm
7Neogloboquadrina pachyderma, δ18O standard deviationN. pachyderma δ18O std dev±Spielhagen, Robert FMass spectrometer Finnigan MAT 253 coupled to a KIEL IV carbonate preparation deviceMorphotype Np4-5
8Neogloboquadrina pachyderma, δ13CN. pachyderma δ13C‰ PDBSpielhagen, Robert FMass spectrometer Finnigan MAT 253 coupled to a KIEL IV carbonate preparation deviceMorphotype Np1-2; size fraction 100-250 µm
9Neogloboquadrina pachyderma, δ13C standard deviationN. pachyderma δ13C std dev±Spielhagen, Robert FMass spectrometer Finnigan MAT 253 coupled to a KIEL IV carbonate preparation deviceMorphotype Np1-2
10Neogloboquadrina pachyderma, δ13CN. pachyderma δ13C‰ PDBSpielhagen, Robert FMass spectrometer Finnigan MAT 253 coupled to a KIEL IV carbonate preparation deviceMorphotype Np4-5; size fraction 100-250 µm
11Neogloboquadrina pachyderma, δ13C standard deviationN. pachyderma δ13C std dev±Spielhagen, Robert FMass spectrometer Finnigan MAT 253 coupled to a KIEL IV carbonate preparation deviceMorphotype Np4-5
12Neogloboquadrina pachyderma, δ18ON. pachyderma δ18O‰ PDBSpielhagen, Robert FIce volume correctedMorphotype Np1-2
13Neogloboquadrina pachyderma, δ18ON. pachyderma δ18O‰ PDBSpielhagen, Robert FIce volume correctedMorphotype Np4-5
14Δδ18OΔδ18OSpielhagen, Robert FIce volume correctedMorphotype Np1-2 [d18O (Np1-2) of N.pachyderma - d18Oec at 70-90 m]
15Δδ18OΔδ18OSpielhagen, Robert FIce volume correctedMorphotype Np4-5 [d18O (Np4-5) of N.pachyderma - d18Oec at 35-45 m]
Size:
975 data points

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