Development of Proxy Methods for Climate Reconstruction in the Barents Sea

Deniz Koseoglu1, Simon Belt1 and Jochen Knies2,3


Biogeochemistry Research Centre, Plymouth University, Plymouth, United Kingdom
2 Centre for Arctic Gas Hydrate, Environment and Climate, UiT – The Arctic University of Norway, Tromsø, Norway
3 Geological Survey of Norway, Trondheim, Norway

Presented at: 4th Annual Palaeo-Arctic Spatial and Temporal (PAST) Gateways Meeting, Geological Survey of Norway, Trondheim, Norway, 23-27 May 2016
27th Annual Meeting of the British Organic Geochemical Society, Imperial College London, London, U.K., 13-14 July 2016.

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IP25, a highly branched isoprenoid (HBI) monoene (Belt et al., 2007), was determined to be a highly specific and selective indicator of seasonal sea ice cover following several studies throughout the Arctic Ocean (for a review, see Belt and Müller, 2013). Furthermore, combined analysis of IP25 with other phytoplankton biomarkers provided a stronger, semi-quantitative correlation with sea ice concentration and a more detailed description of the climatically sensitive polar regions (Smik et al., 2016). The ice proxy is biosynthesized by minor diatom species belonging to the Haslea and Pleurosigma genera, which inhabit the underside of sea ice (Brown et al., 2014). In the present study, the spatial distribution of IP25 and structurally similar HBI lipids was evaluated across the highly productive and hydrographically complex Barents Sea region to determine whether they reflect the overlying oceanographic conditions.

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