Nordic Seas polynyas and their role in preconditioning marine productivity during the Last Glacial Maximum

Jochen Knies , Denizcan Köseoğlu , Leif Rise , Nicole Baeten , Valérie K. Bellec , Reidulv Bøe , Martin Klug , Giuliana Panieri , Patrycja Jernas , Simon T. Belt


Arctic and Antarctic polynyas are crucial sites for deep-water formation, which helps sustain global ocean circulation. During glacial times, the occurrence of polynyas proximal to expansive ice sheets in both hemispheres has been proposed to explain limited ocean ven- tilation and a habitat requirement for marine and higher-trophic terrestrial fauna. Nonetheless, their existence remains equivocal, not least due to the hitherto paucity of sufficiently characteristic proxy data. Here we demonstrate polynya formation in front of the NW Eurasian ice sheets during the Last Glacial Maximum (LGM), which resulted from katabatic winds blowing seaward of the ice shelves and upwelling of warm, sub-surface Atlantic water. These polynyas sustained ice-sheet build-up, ocean ventilation, and marine productivity in an otherwise glacial Arctic desert. Following the catastrophic meltwater discharge from the collapsing ice sheets at ~17.5 ka BP, polynya formation ceased, marine productivity declined dramatically, and sea ice expanded rapidly to cover the entire Nordic Seas.
Author Jochen Knies
Jochen Knies,,
, Denizcan Köseoğlu
Denizcan Köseoğlu,,
, Leif Rise
Leif Rise,,
, Nicole Baeten
Nicole Baeten,,
, Valérie K. Bellec
Valérie K. Bellec,,
, Reidulv Bøe
Reidulv Bøe,,
, Martin Klug
Martin Klug,,
, Giuliana Panieri
Giuliana Panieri,,
, Patrycja Jernas (FOG / IO)
Patrycja Jernas,,
- Institute of Oceanography
, Simon T. Belt
Simon T. Belt,,
Journal seriesNature Communications, ISSN , e-ISSN 2041-1723, (A 45 pkt)
Issue year2018
Publication size in sheets0.5
Article number3959
Keywords in EnglishNordic Seas polynyas, last glacial maximum, marine productivity
ASJC Classification1300 General Biochemistry, Genetics and Molecular Biology; 1600 General Chemistry; 3100 General Physics and Astronomy
Languageen angielski
LicenseJournal (articles only); published final; Uznanie Autorstwa (CC-BY); with publication
Score (nominal)45
Score sourcejournalList
ScoreMinisterial score = 45.0, 05-02-2020, ArticleFromJournal
Publication indicators Scopus SNIP (Source Normalised Impact per Paper): 2017 = 2.912; WoS Impact Factor: 2018 = 11.878 (2) - 2018=13.811 (5)
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