FN Archimer Export Format PT J TI Ocean surface and bottom water conditions, iceberg drift and sediment transport on the North Iceland margin during MIS 3 and MIS 2 BT AF Andrews, J.T. Smik, L. Belt, S.T. Sicre, M.-A. McCave, I.N. AS 1:1;2:2;3:2;4:3;5:4; FF 1:;2:;3:;4:;5:; C1 Institute of Arctic and Alpine Research, Department of Geological Sciences, University of Colorado, Boulder, CO, 80303, USA Biogeochemistry Research Centre, School of Geography, Earth and Environmental Sciences, University of Plymouth, Drake Circus, Plymouth, PL4 8AA, UK LOCEAN, CNRS, Sorbonne Université, Campus Pierre et Marie Curie, 4 Place Jussieu, Paris, France Godwin Laboratory for Palaeoclimate Research, Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, CB2 3EQ, UK C2 UNIV COLORADO BOULDER, USA UNIV PLYMOUTH, UK UNIV PARIS 06, FRANCE UNIV CAMBRIDGE, UK IF 4.456 TC 1 UR https://archimer.ifremer.fr/doc/00664/77652/95959.pdf LA English DT Article CR IMAGES V LEG 1-MD114 IMAGES V LEG 4-MD114 IMAGES V LEG 5 BO Marion Dufresne DE ;Iceland Plateau;MIS 2 and 3;Sea ice biomarkers;IP25;Alkenones;Sortable silt;Sediment provenance AB 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. PY 2021 PD JAN SO Quaternary Science Reviews SN 0277-3791 PU Elsevier BV VL 252 UT 000604567600003 DI 10.1016/j.quascirev.2020.106722 ID 77652 ER EF