Nørgaard-Pedersen, Niels; Mikkelsen, Naja; Lassen, Susanne Juul; Kristoffersen, Yngve; Sheldon, Emma (2014): Age determination and faunal composition of sediments off northern Greenland [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.833626, Supplement to: Nørgaard-Pedersen, N et al. (2007): Reduced sea ice concentrations in the Arctic Ocean during the last interglacial period revealed by sediment cores off northern Greenland. Paleoceanography, 22(1), PA1218, https://doi.org/10.1029/2006PA001283
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Abstract:
We present a record encompassing marine isotope stages 7-1 from a hitherto unexplored and heavily ice-covered area of the Arctic Ocean, the Lomonosov Ridge off the northern Greenland-Canada continental margin, using nannofossil and benthic foraminifera stratigraphy. Planktic foraminifera assemblages are used as a key paleoceanographic proxy, and a surprisingly large variability is found for an interior Arctic Ocean site. Abundant small (63-125 µm) subpolar Turborotalita quinqueloba occur in two sections, possibly representing substages 5e (last interglacial) and 5a (warm interstadial). However, the present-day circulation pattern and the very distant location of high productive regions cannot explain such high abundances of subpolar specimens in the interior, perennially sea ice-covered Arctic Ocean. Hence our proxy record indicates that last interglacial sea ice concentrations were reduced off some areas of northern Greenland-Canada. Whether this was part of a larger regional pattern or it represents the influence of polynya areas with locally increased productivity remains to be solved. With respect to glacial conditions, increased ice-rafted debris (IRD) deposition in the area appears to be associated with glacial stages 6, 4, and late 3. Stage 2 sediments (including the Last Glacial Maximum) are condensed with a sparse IRD content only.
Coverage:
Median Latitude: 85.307425 * Median Longitude: -47.670433 * South-bound Latitude: 84.812670 * West-bound Longitude: -84.829830 * North-bound Latitude: 88.036000 * East-bound Longitude: 144.166200
Date/Time Start: 1991-08-27T00:00:00 * Date/Time End: 1991-09-12T00:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets
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Datasets listed in this publication series
- Nørgaard-Pedersen, N; Mikkelsen, N; Lassen, SJ et al. (2014): (Table 4) Planktic foraminifera in core-top sedoments of the Artic Ocean. https://doi.org/10.1594/PANGAEA.833625
- Nørgaard-Pedersen, N; Mikkelsen, N; Lassen, SJ et al. (2014): (Table 2) Age determination of sediment cores GreenICE_10 and GreenICE_11. https://doi.org/10.1594/PANGAEA.833623
- Nørgaard-Pedersen, N; Mikkelsen, N; Lassen, SJ et al. (2014): (Table 3) Nannofossil abundances in sediment cores GreenICE_10 and GreenICE_11. https://doi.org/10.1594/PANGAEA.833624