Journal cover Journal topic
Climate of the Past An interactive open-access journal of the European Geosciences Union
doi:10.5194/cp-2017-22
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
28 Mar 2017
Review status
This discussion paper is under review for the journal Climate of the Past (CP).
Central Arctic Ocean paleoceanography from ~ 50 ka to present, on the basis of ostracode faunal assemblages from SWERUS 2014 expedition
Laura Gemery1, Thomas M. Cronin1, Robert K. Poirier1,2, Christof Pearce3,4, Natalia Barrientos3, Matt O’Regan3, Carina Johansson3, Andrey Koshurnikov5,6, and Martin Jakobsson3 1US Geological Survey, Reston, Virginia, USA
2Rensselaer Polytechnic Institute, Department of Earth & Environmental Sciences, Troy, New York, USA
3Department of Geological Sciences and Bolin Centre for Climate Research, Stockholm University, Stockholm, 10691, Sweden
4Department of Geoscience, Aarhus University, Aarhus, 8000, Denmark
5Tomsk National Research Polytechnic University, Tomsk, Russia
6Moscow State University, Geophysics, Russian Federation
Abstract. Late Quaternary paleoceanographic changes in the central Arctic Ocean were reconstructed from a multicore and gravity core from the Lomonosov Ridge (Arctic Ocean) collected during the 2014 SWERUS-C3 Expedition. Ostracode assemblages dated by accelerator mass spectrometry (AMS) indicate changing sea-ice conditions and warm Atlantic Water (AW) inflow to the Arctic Ocean from ~ 50 ka to present. Key taxa used as environmental indicators include Acetabulastoma arcticum (perennial sea ice), Polycope spp. (productivity and sea ice), Krithe hunti (partially sea-ice free conditions, deep water inflow), and Rabilimis mirabilis (high nutrient, AW inflow). Results indicate seasonally sea-ice free conditions during Marine Isotope Stage (MIS) 3 (~ 57–29 ka), rapid deglacial changes in water mass conditions (15–11 ka), seasonally sea-ice free conditions during the early Holocene (~ 10–7 ka) and perennial sea ice during the late Holocene. Comparisons with faunal records from other cores from the Mendeleev and Lomonosov Ridges suggest generally similar patterns, although sea-ice cover during the last glacial maximum may have been less extensive at the southern Lomonosov Ridge at our core site (~ 85.15° N, 152° E) than farther north and towards Greenland. The new data also provide evidence for abrupt, large-scale shifts in ostracode species depth and geographical distributions during rapid climatic transitions.

Citation: Gemery, L., Cronin, T. M., Poirier, R. K., Pearce, C., Barrientos, N., O’Regan, M., Johansson, C., Koshurnikov, A., and Jakobsson, M.: Central Arctic Ocean paleoceanography from ~ 50 ka to present, on the basis of ostracode faunal assemblages from SWERUS 2014 expedition, Clim. Past Discuss., doi:10.5194/cp-2017-22, in review, 2017.
Laura Gemery et al.
Laura Gemery et al.
Laura Gemery et al.

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Short summary
Continuous, highly abundant and well preserved fossil ostracodes were studied from radiocarbon-dated sediment cores collected on the Lomonosov Ridge (Arctic Ocean) that indicate varying oceanographic conditions during the last ~ 50 ka. Ostracode assemblages from cores taken during the SWERUS-C3 2014 Expedition, Leg 2, reflect paleoenvironmental changes during glacial, deglacial, and interglacial transitions, including changes in sea-ice cover and Atlantic water inflow into the Eurasian Basin.
Continuous, highly abundant and well preserved fossil ostracodes were studied from...
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