Biomarker record of sediment core MSM44_353-3 ...

• Main Authors: Saini, Jeetendra, Stein, Ruediger, Fahl, Kirsten, Weiser, Jens, Hebbeln, Dierk, Hillaire-Marcel, Claude, de Vernal, Anne
• Format: Dataset
• Language: English
• Published: PANGAEA 2020
• Subjects: Baffin Bay; brassicasterol; HBI III; Holocene; IP25; PIP25 index; Sea ice; DEPTH, sediment/rock; AGE; Carbon, organic, total; Size fraction 2.000-0.063 mm, sand; Sedimentation rate; Accumulation rate, mass; Accumulation rate, total organic carbon; 2,6,10,14-Tetramethyl-7-3-methylpent-4-enylpentadecane per unit sediment mass; 2,6,10,14-Tetramethyl-7-3-methylpent-4-enylpentadecane, per unit mass total organic carbon; Accumulation rate, 2,6,10,14-Tetramethyl-7-3-methylpent-4-enylpentadecane; 24-Methylcholesta-5,22E-dien-3beta-ol per unit sediment mass; 24-Methylcholesta-5,22E-dien-3beta-ol, per unit mass total organic carbon; Accumulation rate, 24-Methylcholesta-5,22E-dien-3beta-ol; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol per unit sediment mass; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol, per unit mass total organic carbon; Accumulation rate, 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol; 9Z-2,6,10,14-Tetramethyl-7-3-methylpent-4-enylidenpentadeca-9-ene per unit sediment mass; 9Z-2,6,10,14-Tetramethyl-7-3-methylpent-4-enylidenpentadeca-9-ene, per unit mass total organic carbon; Accumulation rate, 9Z-2,6,10,14-Tetramethyl-7-3-methylpent-4-enylidenpentadeca-9-ene; Phytoplankton biomarker HBI TR25 index; Phytoplankton biomarker Brassicasterol IP25 index; Phytoplankton biomarker Dinosterol IP25 index; Phytoplankton biomarker C25 HBI Z triene IP25 index; Gravity corer; Grain size, sieving; Calculated; Gas chromatography - Mass spectrometry GC-MS; MSM44; Maria S. Merian; Paleoenvironmental Reconstructions from Marine Sediments @ AWI AWI_Paleo; albedo; Baffin; Greenland; Ice Sheet; Melville bugt; Phytoplankton
• Online Access: https://dx.doi.org/10.1594/pangaea.911365; https://doi.pangaea.de/10.1594/PANGAEA.911365

Arctic sea ice is a critical component of the climate system, known to influence ocean circulation, earth's albedo, and ocean-atmosphere heat and gas exchange. Current developments in the use of IP25 (a sea ice proxy with 25 carbon atoms only synthesized by Arctic sea ice diatoms) have proven it to be a suitable proxy for palaeo-sea ice reconstructions over hundreds of thousands to even million years timescales. In the NE-Baffin Bay, off NW-Greenland, Melville Bugt is a climate-sensitive region characterized by strong seasonal sea ice variability and strong melt-water discharge from the Greenland Ice Sheet (GIS). Here, we present a centennial-scale resolution Holocene sea ice record, based on IP25 and open-water phytoplankton biomarkers (brassicasterol, dinosterol and HBI III) using core GeoB19927-3 (73°35.26' N, 58°05.66' W). Seasonal to ice-edge conditions near the core site is documented for most of the Holocene period with some significant variability. A cold interval, in the lower-most part, ...