Biomarker distributions in sediment core PS2767-4 ...

• Main Authors: Stein, Ruediger, Fahl, Kirsten
• Format: Dataset
• Language: English
• Published: PANGAEA 2012
• Subjects: DEPTH, sediment/rock; AGE; Carbon, organic, total; 2,6,10,14-Tetramethyl-7-3-methylpent-4-enylpentadecane, per unit mass total organic carbon; 2,10,14-Trimethyl-6-enyl-7-3-methylpent-1-enylpentadecene, per unit mass total organic carbon; C25 highly branched isoprenoid diene/IP25 ratio; Phytoplankton biomarker Brassicasterol IP25 index; 24-Methylcholesta-5,22E-dien-3beta-ol, per unit mass total organic carbon; 24-Methylcholest-5-en-3beta-ol, per unit mass total organic carbon; 24-ethylcholest-5-en-3beta-ol, per unit mass total organic carbon; Kasten corer; Element analyser CHN, LECO CNS 2000; Gas chromatography - Mass spectrometry GC-MS; Calculated; ARK-XI/1; Polarstern; Paleoenvironmental Reconstructions from Marine Sediments @ AWI AWI_Paleo; Arctic Ocean; Lomonosov Ridge; Phytoplankton; Sea ice
• Online Access: https://dx.doi.org/10.1594/pangaea.803235; https://doi.pangaea.de/10.1594/PANGAEA.803235

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 ... : Supplement to: Stein, Ruediger; Fahl, Kirsten (2012): A first southern Lomonosov Ridge (Arctic Ocean) 60 ka IP25 sea-ice record. Polarforschung, 82(1), 83-86 ...