Seasonal sea ice persists through the Holocene Thermal Maximum at 80°N

The cryospheric response to climatic warming responsible for recent Arctic sea ice decline can be elucidated using marine geological archives which offer an important long-term perspective. The Holocene Thermal Maximum, between 10 and 6 thousand years ago, provides an opportunity to investigate sea ice during a warmer-than-present interval. Here we use organic biomarkers and benthic foraminiferal stable isotope data from two sediment cores in the northernmost Barents Sea (>80 °N) to reconstruct seasonal sea ice between 11.7 and 9.1 thousand years ago. We identify the continued persistence of sea-ice biomarkers which suggest spring sea ice concentrations as high as 55%. During the same period, high foraminiferal oxygen stable isotopes and elevated phytoplankton biomarker concentrations indicate the influence of warm Atlantic-derived bottom water and peak biological productivity, respectively. We conclude that seasonal sea ice persisted in the northern Barents Sea during the Holocene Thermal Maximum, despite warmer-than-present conditions and Atlantic Water inflow.


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Authors: Pieńkowski, A.J., Husum, K., Belt, S.T., Ninneman, U., Köseoğlu, D., Divine, D.V., Smik, L., Knies, J., Hogan, K. ORCIDORCID record for K. Hogan, Noormets, R.

On this site: Kelly Hogan
15 June, 2021
Nature Communications Earth and the Environment / 2
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