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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
2018
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| Online Access: | https://doi.org/10.1594/PANGAEA.895535 |
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| _version_ | 1867168195795746816 |
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| author | Telesiński, Maciej Mateusz Bauch, Henning A Spielhagen, Robert F |
| author_facet | Telesiński, Maciej Mateusz Bauch, Henning A Spielhagen, Robert F |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Sediment core PS1904 reveals continuous records of planktic and benthic foraminiferal stable isotopes (d18O/d13C) from the north-eastern Greenland continental margin. The data show good comparability with other records from the Nordic Seas, allowing the stratigraphic range of PS1904 to be dated to Marine Isotope Stage (MIS) 6. Focusing on MIS 5 reveals light d18O values during MIS 5a compared to the last interglacial peak (MIS 5e) which indicates that surface and bottom water layers were strongly affected by freshwater during the former event. We present two possible scenarios explaining the origin and routing of the freshwater: (i) drainage of a Eurasian proglacial lake coupled with the collapse of the Kara Sea Ice Sheet at the MIS 5b/a boundary, and (ii) destabilization and melting of the nearby Greenland Ice Sheet. Although both scenarios could have acted simultaneously, sediment records from the Eurasian sector of the Arctic Ocean hint at the proglacial lake system in north-western Siberia as the largest freshwater source. Regardless of the actual source, the freshwater lowered the surface ocean salinity causing water column stratification and sea ice expansion. Increased sea-ice abundance led to a higher albedo and probably contributed to the cooling and global ice sheet growth that occurred subsequently during MIS 4. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_895535 |
| institution | PANGAEA |
| language | en |
| publishDate | 2018 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Planktic and benthic stable oxygen and carbon isotope, IRD, planktic foraminifera data and sand fraction content of sediment core PS1904-2 Telesiński, Maciej Mateusz Bauch, Henning A Spielhagen, Robert F ARK-VII/1; Counting >250 µm fraction; Counting 125-250 µm fraction; DEPTH, sediment/rock; Foraminifera, planktic; Foraminifera, planktic, subpolar; GIK21904-2 PS17/079; Greenland Sea; Ice rafted debris; KAL; Kasten corer; Mass spectrometer, Finnigan, MAT 253; Neogloboquadrina pachyderma, δ13C; Neogloboquadrina pachyderma, δ18O; Oridorsalis umbonatus, δ13C; Oridorsalis umbonatus, δ18O; Polarstern; PS17; PS1904-2; Size fraction > 0.063 mm, sand Sediment core PS1904 reveals continuous records of planktic and benthic foraminiferal stable isotopes (d18O/d13C) from the north-eastern Greenland continental margin. The data show good comparability with other records from the Nordic Seas, allowing the stratigraphic range of PS1904 to be dated to Marine Isotope Stage (MIS) 6. Focusing on MIS 5 reveals light d18O values during MIS 5a compared to the last interglacial peak (MIS 5e) which indicates that surface and bottom water layers were strongly affected by freshwater during the former event. We present two possible scenarios explaining the origin and routing of the freshwater: (i) drainage of a Eurasian proglacial lake coupled with the collapse of the Kara Sea Ice Sheet at the MIS 5b/a boundary, and (ii) destabilization and melting of the nearby Greenland Ice Sheet. Although both scenarios could have acted simultaneously, sediment records from the Eurasian sector of the Arctic Ocean hint at the proglacial lake system in north-western Siberia as the largest freshwater source. Regardless of the actual source, the freshwater lowered the surface ocean salinity causing water column stratification and sea ice expansion. Increased sea-ice abundance led to a higher albedo and probably contributed to the cooling and global ice sheet growth that occurred subsequently during MIS 4. |
| title | Planktic and benthic stable oxygen and carbon isotope, IRD, planktic foraminifera data and sand fraction content of sediment core PS1904-2 |
| topic | ARK-VII/1; Counting >250 µm fraction; Counting 125-250 µm fraction; DEPTH, sediment/rock; Foraminifera, planktic; Foraminifera, planktic, subpolar; GIK21904-2 PS17/079; Greenland Sea; Ice rafted debris; KAL; Kasten corer; Mass spectrometer, Finnigan, MAT 253; Neogloboquadrina pachyderma, δ13C; Neogloboquadrina pachyderma, δ18O; Oridorsalis umbonatus, δ13C; Oridorsalis umbonatus, δ18O; Polarstern; PS17; PS1904-2; Size fraction > 0.063 mm, sand |
| url | https://doi.org/10.1594/PANGAEA.895535 |