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Müller, Juliane; Stein, Ruediger (2014): Late glacial and deglacial age model and biomarker analyses of sediment core MSM05/5_712-2 from the western continental slope of Svalbard. PANGAEA,, Supplement to: Müller, J; Stein, R (2014): High-resolution record of late glacial and deglacial sea ice changes in Fram Strait corroborates ice-ocean interactions during abrupt climate shifts. Earth and Planetary Science Letters, 403, 446-455,

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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 (and/or atmospheric) variability. A long-lasting perennial sea ice coverage in eastern Fram Strait persisted only at the very end of the Last Glacial Maximum (i.e. from 19.2 to 17.6 ka BP) and was abruptly reduced at the onset of Heinrich Event 1 - coincident with or possibly even inducing the collapse of the Atlantic Meridional Overturning Circulation (AMOC). Further maximum sea ice conditions prevailed during the Younger Dryas cooling event and support the assumption of an AMOC reduction due to increased formation and export of Arctic sea ice through Fram Strait. A significant retreat of sea ice and sea surface warming are observed for the Early Holocene.
Latitude: 78.915662 * Longitude: 6.767167
Date/Time Start: 2007-08-04T10:00:00 * Date/Time End: 2007-08-04T10:00:00
Minimum DEPTH, sediment/rock: 2.11 m * Maximum DEPTH, sediment/rock: 8.90 m
MSM05/5_712-2 * Latitude: 78.915662 * Longitude: 6.767167 * Date/Time: 2007-08-04T10:00:00 * Elevation: -1389.0 m * Recovery: 9.5 m * Location: Fram Strait * Campaign: MSM05/5 * Basis: Maria S. Merian * Device: Kasten corer (KAL)
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.
#NameShort NameUnitPrincipal InvestigatorMethodComment
1DEPTH, sediment/rockDepthmGeocode
2AGEAgeka BPGeocode
3Sedimentation rateSed ratecm/kaMüller, JulianeCalculated
4Carbon, organic, totalTOC%Müller, JulianeElement analyser CHN, LECO
52,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane per unit mass total organic carbonIP25/TOCµg/gMüller, JulianeGas chromatography - Mass spectrometry (GC-MS)
624-Methylcholesta-5,22E-dien-3beta-ol per unit mass total organic carbonBrassicasterol/TOCµg/gMüller, JulianeGas chromatography - Mass spectrometry (GC-MS)
7Phytoplankton biomarker Brassicasterol IP25 indexPBIP25Müller, JulianeCalculated
84alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol per unit mass total organic carbonDinosterol/TOCµg/gMüller, JulianeGas chromatography - Mass spectrometry (GC-MS)
9Phytoplankton biomarker Dinosterol IP25 indexPDIP25Müller, JulianeCalculated
102,10,14-Trimethyl-6-enyl-7-(3-methylpent-1-enyl)pentadecene per unit mass total organic carbonC25 HBI diene/TOCµg/gMüller, JulianeGas chromatography - Mass spectrometry (GC-MS)
112,10,14-Trimethyl-6-enyl-7-(3-methylpent-1-enyl)pentadecene/2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane ratioDIP25Müller, JulianeCalculated
3295 data points

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