Late glacial and deglacial age model and biomarker analyses of sediment core MSM05/5_712-2 from the western continental slope of Svalbard ...

• Main Authors: Müller, Juliane, Stein, Ruediger
• Format: Dataset
• Language: English
• Published: PANGAEA 2014
• Subjects: DEPTH, sediment/rock; AGE; Sedimentation rate; Carbon, organic, total; 2,6,10,14-Tetramethyl-7-3-methylpent-4-enylpentadecane, per unit mass total organic carbon; 24-Methylcholesta-5,22E-dien-3beta-ol, per unit mass total organic carbon; Phytoplankton biomarker Brassicasterol IP25 index; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol, per unit mass total organic carbon; Phytoplankton biomarker Dinosterol IP25 index; 2,10,14-Trimethyl-6-enyl-7-3-methylpent-1-enylpentadecene, per unit mass total organic carbon; 2,10,14-Trimethyl-6-enyl-7-3-methylpent-1-enylpentadecene/2,6,10,14-Tetramethyl-7-3-methylpent-4-enylpentadecane ratio; Kasten corer; Calculated; Element analyser CHN, LECO; Gas chromatography - Mass spectrometry GC-MS; MSM05/5; Maria S. Merian; Paleoenvironmental Reconstructions from Marine Sediments @ AWI AWI_Paleo; Arctic Ocean; Fram Strait; North Atlantic; Phytoplankton; Sea ice; Svalbard
• Online Access: https://dx.doi.org/10.1594/pangaea.833668; https://doi.pangaea.de/10.1594/PANGAEA.833668

The transition from last glacial to deglacial and subsequently to modern interglacial climate conditions was accompanied by abrupt shifts in the palaeoceanographic setting in the subpolar North Atlantic. Knowledge about the role that sea ice coverage played during these rapid climate reversals is limited since most marine sediment cores from the higher latitudes provide only a coarse temporal resolution and often poorly preserved microfossils. Here we present a highly resolved reconstruction of sea ice conditions that characterised the eastern Fram Strait - a key area for water mass exchange between the Arctic Ocean and the North Atlantic - for the past 30 ka BP. This reconstruction is based on the distribution of the sea ice biomarker IP25 and phytoplankton derived biomarkers in a sediment core from the continental slope of western Svalbard. During the late glacial (30 ka to 19 ka BP), recurrent advances and retreats of sea ice characterised the study area and point to a hitherto less considered oceanic ... : For the calculation of the PBIP25 and PDIP25 indices mean concentrations of the respective biomarkers and the following concentration balance factors were used: 0.0127 for PBIP25 and 0.0322 for PDIP25. ...