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Stein, Ruediger; Fahl, Kirsten (2012): Biomarker distributions in sediment core PS2767-4. PANGAEA,, Supplement to: Stein, R; Fahl, K (2012): A first southern Lomonosov Ridge (Arctic Ocean) 60 ka IP25 sea-ice record. Polarforschung, 82(1), 83-86, hdl:10013/epic.40434.d001

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Here, we present a first (low-resolution) biomarker sea-ice proxy record from the High Arctic (southern Lomonosov Ridge), going back in time to about 60 ka (MIS 3 to MIS 1). Variable concentrations of the sea-ice diatom specific highly branched isoprenoid (HBI) with 25 carbon atoms ("IP25"), in combination with the phytoplankton biomarker brassicasterol, suggest variable seasonal sea-ice coverage and open-water productivity during MIS 3. During most of MIS 2, the spring to summer sea-ice margin significantly extended towards the south, resulting in a drastic decrease in phytoplankton productivity. During the Early Holocene Climate Optimum, brassicasterol reached its maximum, interpreted as signal for elevated phytoplankton productivity due to a significantly reduced sea-ice cover. During the mid-late Holocene, IP25 increased and brassicasterol decreased, indicating extended sea-ice cover and reduced phytoplankton productivity, respectively. The HBI diene/IP25 ratios probably reached maximum values during the Bølling-Allerød warm period and decreased during the Holocene, suggesting a correlation with sea-surface temperature.
Latitude: 79.743100 * Longitude: 144.006100
Date/Time Start: 1995-08-31T00:00:00 * Date/Time End: 1995-08-31T00:00:00
Minimum DEPTH, sediment/rock: 0.300 m * Maximum DEPTH, sediment/rock: 8.220 m
PS2767-4 (PS36/066) * Latitude: 79.743100 * Longitude: 144.006100 * Date/Time: 1995-08-31T00:00:00 * Elevation: -572.0 m * Recovery: 8.25 m * Location: Arctic Ocean * Campaign: ARK-XI/1 (PS36) * Basis: Polarstern * Method/Device: Kasten corer (KAL) * Comment: 9 core sections: 0.22-1.22, 1.22-2.22, 2.22-3.22, 3.22-4.22, 4.22-5.22, 5.22-6.22, 6.22-7.22, 7.22-8, 8-8.2 m
428 data points

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