Ocean surface and bottom water conditions, iceberg drift and sediment transport on the North Iceland margin during MIS 3 and 2
Radiocarbon dates and marine tephra suggest that the upper 10 m of core MD99-2274 off North Iceland extends from ~0 to ~65 ka BP. A multi-proxy sediment and biomarker study at a ~0.5 ky resolution is used to derive a paleoclimate scenario for this area of the southwestern Nordic Seas, which during t...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.931154 2023-05-15T16:29:00+02:00 Ocean surface and bottom water conditions, iceberg drift and sediment transport on the North Iceland margin during MIS 3 and 2 Andrews, John T Smik, Lukas Belt, Simon T Sicre, Marie-Alexandrine McCave, I Nick LATITUDE: 67.582500 * LONGITUDE: -17.073500 * DATE/TIME START: 1999-08-01T00:00:00 * DATE/TIME END: 1999-08-01T00:00:00 2021-05-05 application/zip, 4 datasets https://doi.pangaea.de/10.1594/PANGAEA.931154 https://doi.org/10.1594/PANGAEA.931154 en eng PANGAEA Andrews, John T; Smik, Lukas; Belt, Simon T; Sicre, Marie-Alexandrine; McCave, I Nick (2021): Ocean surface and bottom water conditions, iceberg drift and sediment transport on the North Iceland margin during MIS 3 and MIS 2. Quaternary Science Reviews, 252, 106722, https://doi.org/10.1016/j.quascirev.2020.106722 https://doi.pangaea.de/10.1594/PANGAEA.931154 https://doi.org/10.1594/PANGAEA.931154 CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY 1553Is/Fr alkenones CALYPSO Calypso Corer flow speeds Iceland margin IMAGES V Marion Dufresne (1995) MD114 MD99-2274 mineral compositions North Iceland Shelf sea ice biomarker Dataset 2021 ftpangaea https://doi.org/10.1594/PANGAEA.931154 https://doi.org/10.1016/j.quascirev.2020.106722 2023-01-20T07:34:44Z Radiocarbon dates and marine tephra suggest that the upper 10 m of core MD99-2274 off North Iceland extends from ~0 to ~65 ka BP. A multi-proxy sediment and biomarker study at a ~0.5 ky resolution is used to derive a paleoclimate scenario for this area of the southwestern Nordic Seas, which during the Holocene had intermittent excursions of icebergs and a seasonal cover of drifting sea ice across the site. The sortable silt mean size (S̅S̅) suggests a bottom current (1000 m depth) flow speed maximum to minimum range of ~8 cm/s during Marine Isotope Stages 2 to 3, but the data are unreliable for the Holocene. Slow-down in flow speeds may be associated with massive ice and water discharges linked to the Hudson Strait ice stream (H-events) and to melt of icebergs from Greenland in the Nordic seas where convection would have been suppressed. Five pulses of sediment with a distinct felsic component are associated with iceberg transport from E/NE Greenland. Sea ice, open water and sea surface temperature (SST) biomarker proxies (i.e. IP25, brassicasterol and alkenones) all point towards near-perennial sea ice cover during MIS 3 and 2, rather than seasonal sea ice or open water conditions. Indeed, our biomarker and sediment data require that the seas north of Iceland have a thick, nearly continuous cover of sea-ice through which icebergs, calved from ice stream termini, drift slowly southward. The cross-correlation of the quartz % records between MD99-2274 and the well-dated core PS2644 in Blosseville Basin indicates significant coherence in the records at a multi-millennial (~8 ky) timescale. A transition to open ocean conditions is evident from the early Holocene onwards, albeit with the occurrence of some drift ice and icebergs. Dataset Greenland Greenland Sea Hudson Strait Iceland Nordic Seas Sea ice PANGAEA - Data Publisher for Earth & Environmental Science Greenland Hudson Hudson Strait ENVELOPE(-70.000,-70.000,62.000,62.000) ENVELOPE(-17.073500,-17.073500,67.582500,67.582500) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
1553Is/Fr alkenones CALYPSO Calypso Corer flow speeds Iceland margin IMAGES V Marion Dufresne (1995) MD114 MD99-2274 mineral compositions North Iceland Shelf sea ice biomarker |
spellingShingle |
1553Is/Fr alkenones CALYPSO Calypso Corer flow speeds Iceland margin IMAGES V Marion Dufresne (1995) MD114 MD99-2274 mineral compositions North Iceland Shelf sea ice biomarker Andrews, John T Smik, Lukas Belt, Simon T Sicre, Marie-Alexandrine McCave, I Nick Ocean surface and bottom water conditions, iceberg drift and sediment transport on the North Iceland margin during MIS 3 and 2 |
topic_facet |
1553Is/Fr alkenones CALYPSO Calypso Corer flow speeds Iceland margin IMAGES V Marion Dufresne (1995) MD114 MD99-2274 mineral compositions North Iceland Shelf sea ice biomarker |
description |
Radiocarbon dates and marine tephra suggest that the upper 10 m of core MD99-2274 off North Iceland extends from ~0 to ~65 ka BP. A multi-proxy sediment and biomarker study at a ~0.5 ky resolution is used to derive a paleoclimate scenario for this area of the southwestern Nordic Seas, which during the Holocene had intermittent excursions of icebergs and a seasonal cover of drifting sea ice across the site. The sortable silt mean size (S̅S̅) suggests a bottom current (1000 m depth) flow speed maximum to minimum range of ~8 cm/s during Marine Isotope Stages 2 to 3, but the data are unreliable for the Holocene. Slow-down in flow speeds may be associated with massive ice and water discharges linked to the Hudson Strait ice stream (H-events) and to melt of icebergs from Greenland in the Nordic seas where convection would have been suppressed. Five pulses of sediment with a distinct felsic component are associated with iceberg transport from E/NE Greenland. Sea ice, open water and sea surface temperature (SST) biomarker proxies (i.e. IP25, brassicasterol and alkenones) all point towards near-perennial sea ice cover during MIS 3 and 2, rather than seasonal sea ice or open water conditions. Indeed, our biomarker and sediment data require that the seas north of Iceland have a thick, nearly continuous cover of sea-ice through which icebergs, calved from ice stream termini, drift slowly southward. The cross-correlation of the quartz % records between MD99-2274 and the well-dated core PS2644 in Blosseville Basin indicates significant coherence in the records at a multi-millennial (~8 ky) timescale. A transition to open ocean conditions is evident from the early Holocene onwards, albeit with the occurrence of some drift ice and icebergs. |
format |
Dataset |
author |
Andrews, John T Smik, Lukas Belt, Simon T Sicre, Marie-Alexandrine McCave, I Nick |
author_facet |
Andrews, John T Smik, Lukas Belt, Simon T Sicre, Marie-Alexandrine McCave, I Nick |
author_sort |
Andrews, John T |
title |
Ocean surface and bottom water conditions, iceberg drift and sediment transport on the North Iceland margin during MIS 3 and 2 |
title_short |
Ocean surface and bottom water conditions, iceberg drift and sediment transport on the North Iceland margin during MIS 3 and 2 |
title_full |
Ocean surface and bottom water conditions, iceberg drift and sediment transport on the North Iceland margin during MIS 3 and 2 |
title_fullStr |
Ocean surface and bottom water conditions, iceberg drift and sediment transport on the North Iceland margin during MIS 3 and 2 |
title_full_unstemmed |
Ocean surface and bottom water conditions, iceberg drift and sediment transport on the North Iceland margin during MIS 3 and 2 |
title_sort |
ocean surface and bottom water conditions, iceberg drift and sediment transport on the north iceland margin during mis 3 and 2 |
publisher |
PANGAEA |
publishDate |
2021 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.931154 https://doi.org/10.1594/PANGAEA.931154 |
op_coverage |
LATITUDE: 67.582500 * LONGITUDE: -17.073500 * DATE/TIME START: 1999-08-01T00:00:00 * DATE/TIME END: 1999-08-01T00:00:00 |
long_lat |
ENVELOPE(-70.000,-70.000,62.000,62.000) ENVELOPE(-17.073500,-17.073500,67.582500,67.582500) |
geographic |
Greenland Hudson Hudson Strait |
geographic_facet |
Greenland Hudson Hudson Strait |
genre |
Greenland Greenland Sea Hudson Strait Iceland Nordic Seas Sea ice |
genre_facet |
Greenland Greenland Sea Hudson Strait Iceland Nordic Seas Sea ice |
op_relation |
Andrews, John T; Smik, Lukas; Belt, Simon T; Sicre, Marie-Alexandrine; McCave, I Nick (2021): Ocean surface and bottom water conditions, iceberg drift and sediment transport on the North Iceland margin during MIS 3 and MIS 2. Quaternary Science Reviews, 252, 106722, https://doi.org/10.1016/j.quascirev.2020.106722 https://doi.pangaea.de/10.1594/PANGAEA.931154 https://doi.org/10.1594/PANGAEA.931154 |
op_rights |
CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.931154 https://doi.org/10.1016/j.quascirev.2020.106722 |
_version_ |
1766018690831089664 |