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Christof Pearce

Central Arctic Ocean paleoceanography from ~ 50 ka to present, on the basis of ostracode faunal assemblages from the SWERUS 2014 expedition

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  • Laura Gemery, United States Geological Survey
  • ,
  • Thomas M. Cronin, United States Geological Survey
  • ,
  • Robert K. Poirier, United States Geological Survey, Rensselaer Polytechnic Institute
  • ,
  • Christof Pearce
  • Natalia Barrientos, Stockholm University
  • ,
  • Matt O'Regan, Stockholm University
  • ,
  • Carina Johansson, Stockholm University
  • ,
  • Andrey Koshurnikov, Tomsk National Research Polytechnic University, Moscow State University
  • ,
  • Martin Jakobsson, Stockholm University

Late Quaternary paleoceanographic changes at the Lomonosov Ridge, central Arctic Ocean, were reconstructed from a multicore and gravity core recovered 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. (variable sea-ice margins, high surface productivity), Krithe hunti (Arctic Ocean deep water), and Rabilimis mirabilis (water mass change/AW inflow). Results indicate periodic seasonally sea-ice-free conditions during Marine Isotope Stage (MIS) 3 (57-29ka), rapid deglacial changes in water mass conditions (15-11ka), seasonally sea-ice-free conditions during the early Holocene (10-7ka) 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 new Lomonosov Ridge core site ( 85.15°N, 152°E) than farther north and towards Greenland. The new data provide evidence for abrupt, large-scale shifts in ostracode species depth and geographical distributions during rapid climatic transitions.

Original languageEnglish
JournalClimate of the Past
Pages (from-to)1473-1489
Number of pages17
Publication statusPublished - 3 Nov 2017

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