Contamination of 8.2 ka cold climate records by the Storegga tsunami in the Nordic Seas

Stein Bondevik (), Bjørg Risebrobakken, Steven J. Gibbons, Tine L. Rasmussen and Finn Løvholt
Additional contact information
Stein Bondevik: P.O. Box 133
Bjørg Risebrobakken: Bjerknes Centre for Climate Research
Steven J. Gibbons: P.O. Box. 3930 Ullevål Stadion
Tine L. Rasmussen: UiT the Arctic University of Norway
Finn Løvholt: P.O. Box. 3930 Ullevål Stadion

Nature Communications, 2024, vol. 15, issue 1, 1-7

Abstract: Abstract The 8200-year BP cooling event is reconstructed in part from sediments in the Norwegian and North Seas. Here we show that these sediments have been reworked by the Storegga tsunami – dated to the coldest decades of the 8.2 ka event. We simulate the maximum tsunami flow velocity to be 2–5 m/s on the shelf offshore western Norway and in the shallower North Sea, and up to about 1 m/s down to a water depth of 1000 m. We re-investigate sediment core MD95-2011 and found the cold-water foraminifera in the 8.2 ka layer to be re-deposited and 11,000 years of age. Oxygen isotopes of the recycled foraminifera might have led to an interpretation of a too large and dramatic climate cooling. Our simulations imply that large parts of the sea floor in the Norwegian and North Seas probably were reworked by currents during the Storegga tsunami.

Date: 2024
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DOI: 10.1038/s41467-024-47347-9

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