Coastal lake sediments from Arctic Svalbard suggest colder summers are stormier

Zofia Stachowska, Willem G. M. Bilt () and Mateusz C. Strzelecki
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Zofia Stachowska: University of Szczecin
Willem G. M. Bilt: University of Bergen
Mateusz C. Strzelecki: University of Wrocław

Nature Communications, 2024, vol. 15, issue 1, 1-12

Abstract: Abstract The Arctic is rapidly losing its sea ice cover while the region warms faster than anywhere else on Earth. As larger areas become ice-free for longer, winds strengthen and interact more with open waters. Ensuing higher waves also increase coastal erosion and flooding, threatening communities and releasing permafrost carbon. However, the future trajectory of these changes remains poorly understood as instrumental observations and geological archives remain rare and short. Here, we address this critical knowledge gap by presenting a continuous Holocene-length reconstruction of Arctic eolian activity using coastal lake sediments from Svalbard. Exposed to both polar Easterlies and Westerly storm tracks, sheltered by a bedrock barrier, and subjected to little post-glacial uplift, our study site provides a stable baseline to assess Holocene changes in the dominant wind systems of the Barents Sea region. To do so with high precision, we rely on multiple independent lines of proxy evidence for wind-blown sediment input. Our reconstructions reveal quasi-cyclic summer wind maxima during regional cold periods, and challenge the view that a warmer and less icy future Arctic will be stormier.

Date: 2024
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DOI: 10.1038/s41467-024-53875-1

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