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Title: Multiproxy paleoceanographic study from the western Barents Sea reveals dramatic Younger Dryas onset followed by oscillatory warming trend
Authors: Łącka, Magdalena
Michalska, Danuta
Pawłowska, Joanna
Szymańska, Natalia
Szczuciński, Witold
Forwick, Matthias
Zajączkowski, Marek
Keywords: climate change
Barents Sea
Younger Dryas
marine sediments
polar research
marine geology
sea ice
oceanic circulation
Issue Date: Sep-2020
Publisher: Springer Nature
Citation: Scientific Reports 10:15667, (2020), doi: 10.1038/s41598-020-72747-4
Abstract: The Younger Dryas (YD) is recognized as a cool period that began and ended abruptly during a time of general warming at the end of the last glacial. New multi-proxy data from a sediment gravity core from Storfjordrenna (western Barents Sea, 253 m water depth) reveals that the onset of the YD occurred as a single short-lived dramatic environment deterioration, whereas the subsequent warming was oscillatory. The water masses in the western Barents Sea were likely strongly stratified at the onset of the YD, possibly due to runoff of meltwater combined with perennial sea-ice cover, the latter may last up to several decades without any brake-up. Consequently, anoxic conditions prevailed at the bottom of Storfjordrenna, leading to a sharp reduction of benthic biota and the appearance of vivianite microconcretions which formation is favoured by reducing conditions. While the anoxic conditions in Storfjordrenna were transient, the unfavorable conditions for benthic foraminifera lasted for c. 1300 years. We suggest that the Pre-Boreal Oscillation, just after the onset of the Holocene, may have been a continuation of the oscillatory warming trend during the YD.
Sponsorship: Narodowe Centrum Nauki granty: 2016/21/B/ST10/02308, 2019/33/B/ST10/00297, 2013/10/E/ST10/00166
Appears in Collections:Artykuły naukowe (WNGiG)

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