Ocean surface and bottom water conditions, iceberg drift and sediment transport on the North Iceland margin during MIS 3 and MIS 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...
Published in: | Quaternary Science Reviews |
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ftucambridgeesc:oai:eprints.esc.cam.ac.uk:5980 2023-05-15T16:28:43+02:00 Ocean surface and bottom water conditions, iceberg drift and sediment transport on the North Iceland margin during MIS 3 and MIS 2 Andrews, J.T. Smik, L. Belt, S.T. Sicre, M.-A. McCave, I.N. 2020 text http://eprints.esc.cam.ac.uk/5980/ http://eprints.esc.cam.ac.uk/5980/1/%2721a%20Andrews%20et,%202274,%20N.%20Iceland%20flow%20temp,%20ice.%20QSR.pdf https://doi.org/10.1016/j.quascirev.2020.106722 en eng Elsevier http://eprints.esc.cam.ac.uk/5980/1/%2721a%20Andrews%20et,%202274,%20N.%20Iceland%20flow%20temp,%20ice.%20QSR.pdf Andrews, J.T. and Smik, L. and Belt, S.T. and Sicre, M.-A. and McCave, I.N. (2020) 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. p. 106722. ISSN 0277-3791 DOI https://doi.org/10.1016/j.quascirev.2020.106722 <https://doi.org/10.1016/j.quascirev.2020.106722> 01 - Climate Change and Earth-Ocean Atmosphere Systems Article PeerReviewed 2020 ftucambridgeesc https://doi.org/10.1016/j.quascirev.2020.106722 2021-12-16T23:18:07Z 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 2–3, 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, HBI III, 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 experienced a nearly continuous cover of sea ice, together with icebergs calved from ice stream termini, which drifted 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. Article in Journal/Newspaper Greenland Greenland Sea Hudson Strait Iceland Nordic Seas Sea ice University of Cambridge, Department of Earth Sciences: ESC Publications Greenland Hudson Hudson Strait ENVELOPE(-70.000,-70.000,62.000,62.000) Quaternary Science Reviews 252 106722 |
institution |
Open Polar |
collection |
University of Cambridge, Department of Earth Sciences: ESC Publications |
op_collection_id |
ftucambridgeesc |
language |
English |
topic |
01 - Climate Change and Earth-Ocean Atmosphere Systems |
spellingShingle |
01 - Climate Change and Earth-Ocean Atmosphere Systems Andrews, J.T. Smik, L. Belt, S.T. Sicre, M.-A. McCave, I.N. Ocean surface and bottom water conditions, iceberg drift and sediment transport on the North Iceland margin during MIS 3 and MIS 2 |
topic_facet |
01 - Climate Change and Earth-Ocean Atmosphere Systems |
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 2–3, 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, HBI III, 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 experienced a nearly continuous cover of sea ice, together with icebergs calved from ice stream termini, which drifted 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 |
Article in Journal/Newspaper |
author |
Andrews, J.T. Smik, L. Belt, S.T. Sicre, M.-A. McCave, I.N. |
author_facet |
Andrews, J.T. Smik, L. Belt, S.T. Sicre, M.-A. McCave, I.N. |
author_sort |
Andrews, J.T. |
title |
Ocean surface and bottom water conditions, iceberg drift and sediment transport on the North Iceland margin during MIS 3 and MIS 2 |
title_short |
Ocean surface and bottom water conditions, iceberg drift and sediment transport on the North Iceland margin during MIS 3 and MIS 2 |
title_full |
Ocean surface and bottom water conditions, iceberg drift and sediment transport on the North Iceland margin during MIS 3 and MIS 2 |
title_fullStr |
Ocean surface and bottom water conditions, iceberg drift and sediment transport on the North Iceland margin during MIS 3 and MIS 2 |
title_full_unstemmed |
Ocean surface and bottom water conditions, iceberg drift and sediment transport on the North Iceland margin during MIS 3 and MIS 2 |
title_sort |
ocean surface and bottom water conditions, iceberg drift and sediment transport on the north iceland margin during mis 3 and mis 2 |
publisher |
Elsevier |
publishDate |
2020 |
url |
http://eprints.esc.cam.ac.uk/5980/ http://eprints.esc.cam.ac.uk/5980/1/%2721a%20Andrews%20et,%202274,%20N.%20Iceland%20flow%20temp,%20ice.%20QSR.pdf https://doi.org/10.1016/j.quascirev.2020.106722 |
long_lat |
ENVELOPE(-70.000,-70.000,62.000,62.000) |
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 |
http://eprints.esc.cam.ac.uk/5980/1/%2721a%20Andrews%20et,%202274,%20N.%20Iceland%20flow%20temp,%20ice.%20QSR.pdf Andrews, J.T. and Smik, L. and Belt, S.T. and Sicre, M.-A. and McCave, I.N. (2020) 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. p. 106722. ISSN 0277-3791 DOI https://doi.org/10.1016/j.quascirev.2020.106722 <https://doi.org/10.1016/j.quascirev.2020.106722> |
op_doi |
https://doi.org/10.1016/j.quascirev.2020.106722 |
container_title |
Quaternary Science Reviews |
container_volume |
252 |
container_start_page |
106722 |
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1766018401627537408 |