Identification of Paleo Arctic Winter Sea Ice Limits and the Marginal Ice Zone: Optimised Biomarker-based Reconstructions of Late Quaternary Arctic Sea Ice

L. Smik1, S.T. Belt1, P. Cabedo-Sanz1, A. Navarro-Rodriguez1, S.M.P. Berben2, J. Knies3,4 and K. Husum5


Biogeochemistry Research Centre, Plymouth University, Plymouth, U.K.


Department of Geology, University of Tromsø, Norway


Geological Survey of Norway, Trondheim, Norway


CAGE – Centre for Arctic Gas Hydrate, University of Tromsø, Norway


Norwegian Polar institute, Tromsø, Norway

Presented at: UK Arctic Science Conference 2015, Sheffield, U.K., 16-18 September 2015.

Download: Poster as an A4 pdf file.


In recent years, the analysis of the biomarker IP25 (Belt et al., 2007), a highly branched isoprenoid (HBI) lipid made uniquely by certain Arctic sea icedwelling diatoms (Brown et al., 2014), has been suggested to provide a more direct measure of past sea ice when detected in underlying sediments. Further, combined measurements of IP25 and phytoplankton biomarkers was suggested to provide more semi-quantitative estimates of sea ice concentration. In the current study, we apply this approach using a further HBI lipid, to characterise the maximum (winter) sea ice extent and MIZ, thus providing more detailed information regarding paleo sea ice conditions than through analysis of IP25 alone.

Download the complete poster as an A4 pdf file.

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