EGU24-299, updated on 08 Mar 2024
https://doi.org/10.5194/egusphere-egu24-299
EGU General Assembly 2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

Sea ice distribution in the northeastern Nordic Seas during the Dansgaard-Oeschger events

Wanyee Wong1, Bjørg Risebrobakken1, Kirsten Fahl3, Rüdiger Stein3,4,5, Eystein Jansen1,2, and Juliette Supiot Tessier6,7
Wanyee Wong et al.
  • 1NORCE Norwegian Research Centre, Bjerknes Centre for Climate Research, 5007 Bergen, Norway
  • 2Department of Earth Science, University of Bergen, Bjerknes Centre for Climate Research, 5007 Bergen, Norway
  • 3Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, 27568 Bremerhaven, Germany
  • 4Faculty of Geosciences (FB5), University of Bremen, 28359 Bremen, Germany
  • 5Key Laboratory of Marine Chemistry Theory and Technology, Ocean University of China, 266100 Qingdao, China
  • 6Université des Sciences et Technologies de Lille, 59655 Villeneuve d’Ascq, France
  • 7Department of Earth Sciences, Uppsala University, 75236 Uppsala, Sweden

Sea ice conditions in the eastern Fram Strait during the Dansgaard-Oeschger (D-O) events are reconstructed using biomarkers. The role of the Nordic Seas sea ice has long been recognized as a significant factor influencing the D-O climate changes. Two full D-O cycles between 40 and 34 ka b2k, covering Greenland Stadial (GS) 9, also known as Heinrich Stadial (HS) 4, to Greenland Interstadial (GI) 7 are investigated in high resolution (20-40 yr/sample). Preliminary results suggest an extended sea ice cover in the eastern Fram Strait during both stadials. Repeated polynyas were present during GS-9/HS-4, but not during GS-8. The retreat of the extended sea ice cover in the eastern Fram Strait occurred later during the GS-9/HS-4 to GI-8 transition than during the GS-8 to GI-7 transition. Both interstadials were characterized by a seasonal sea ice cover, with the summer/fall sea ice edge occasionally moving farther north than the study site. Our findings provide new insights on the importance of ocean-ice processes in driving the D-O events.

How to cite: Wong, W., Risebrobakken, B., Fahl, K., Stein, R., Jansen, E., and Supiot Tessier, J.: Sea ice distribution in the northeastern Nordic Seas during the Dansgaard-Oeschger events, EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-299, https://doi.org/10.5194/egusphere-egu24-299, 2024.

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