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Postglacial paleoceanography and paleoenvironments in the northwestern Barents Sea

Published online by Cambridge University Press:  07 May 2019

Elena Ivanova Open the ORCID record for Elena Ivanova [Opens in a new window] ,
Ivar Murdmaa ,
Anne de Vernal ,
Bjørg Risebrobakken ,
Alexander Peyve ,
Camille Brice ,
Elvira Seitkalieva  and
Sergey Pisarev
Elena Ivanova*
Affiliation:
Shirshov Institute of Oceanology, Russian Academy of Sciences, 117997 Moscow, Russia
Ivar Murdmaa
Affiliation:
Shirshov Institute of Oceanology, Russian Academy of Sciences, 117997 Moscow, Russia
Anne de Vernal
Affiliation:
Geotop, Université du Québec à Montréal, H3C 3P8, Montréal, Québec, Canada
Bjørg Risebrobakken
Affiliation:
NORCE Norwegian Research Centre, Bjerknes Centre for Climate Research, 5007, Bergen, Norway
Alexander Peyve
Affiliation:
Geological Institute, Russian Academy of Sciences, 119017 Moscow, Russia
Camille Brice
Affiliation:
Geotop, Université du Québec à Montréal, H3C 3P8, Montréal, Québec, Canada
Elvira Seitkalieva
Affiliation:
Shirshov Institute of Oceanology, Russian Academy of Sciences, 117997 Moscow, Russia
Sergey Pisarev
Affiliation:
Shirshov Institute of Oceanology, Russian Academy of Sciences, 117997 Moscow, Russia
*
*Corresponding author e-mail address: [email protected] (E.V. Ivanova).
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Abstract

The Barents Sea offers a suitable location for documenting advection of warm and saline Atlantic Water (AW) into the Arctic and its impact on deglaciation and postglacial conditions. We investigate the timing, succession, and mechanisms of the transition from proximal glaciomarine to marine environment in the northwestern Barents Sea. Two studied sediment cores demonstrate diachronous retreat of the grounded ice sheet from the Kvitøya Trough (core S2528) to Erik Eriksen Trough (core S2519). Oxygen isotope records from core S2528 depict a two-step pattern, with lower δ18O values prior to the Younger Dryas (YD), and higher values afterward because of advection of the more saline, 18O-enriched AW. At this location, subsurface AW penetration increased during the Allerød and YD/Preboreal transition. In the study area, foraminiferal and dinocyst data from the YD interval suggest cold conditions, extensive sea-ice cover, and brine formation, along with the flow of chilled AW at subsurface and the development of a high-productivity polynya in the Erik Eriksen Trough. Dense winter sea-ice cover with seasonal productivity persisted in the Kvitøya Trough area during the early Holocene, whereas surface warming seems to have occurred during the middle Holocene interval.

Keywords

diamictonforaminifersdinocystsstable isotopesdiachronous deglaciationAtlantic Watericeberg calving
Type
Research Article
Information
Quaternary Research , Volume 92 , Issue 2 , September 2019 , pp. 430 - 449
Copyright
Copyright © University of Washington. Published by Cambridge University Press, 2019 

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