Biomarker concentrations in gravity core MSM45_19-2 ...

• Main Authors: Kolling, Henriette Marie, Schneider, Ralph R, Stein, Ruediger, Fahl, Kirsten
• Format: Dataset
• Language: English
• Published: PANGAEA 2022
• Subjects: 8.2 ka event; Biomarker; brassica sterol; campesterol; dionsterol; HBI III; Holocene; IP25; Labrador Shelf; primary production; Sea ice; Terrigenious input; DEPTH, sediment/rock; Accumulation rate per year; 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 per year; Highly branched isoprenoids Z, triunsatured per unit sediment mass; Highly branched isoprenoids Z, triunsatured, per unit mass total organic carbon; Accumulation rate, highly branched isoprenoids Z, triunsatured per year; 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 per year; 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 per year; 24-Methylcholest-5-en-3beta-ol per unit sediment mass; 24-Methylcholest-5-en-3beta-ol, per unit mass total organic carbon; Accumulation rate, 24-Methylcholest-5-en-3beta-ol per year; Gravity corer; MSM45; Maria S. Merian; ice algae; Ice Sheet
• Online Access: https://dx.doi.org/10.1594/pangaea.949065; https://doi.pangaea.de/10.1594/PANGAEA.949065

Sea ice and paleoenvironmental conditions were reconstructed based on gravity core MSM45_19-2 from the northern Labrador Shelf. Gravity core MSM45_19-2 was obtained during R/V Maria S. Merian expedition MSM45 (58°45.68'N, 61°56.25'W, water depth: 202 m) in 2015 (Schneider et al., 2016).For paleoenvironmental reconstructions of the last 9,000 years BP, biomarkers representing sea ice algae productivity (IP25), open-water phytoplankton productivity (brassicasterol, dinosterol and HBI III (Z)) and terrigenous input (campesterol) where analyzed. Aim of this study was to investigate (i) the role sea ice played before and during the final demise of the Laurentide Ice Sheet between 8.7 and 8.2 kyr BP, and (ii) the effects of meltwater events on remaining sea-ice cover and primary productivity.Concentrations of specific biomarkers were analyzed. 4-5 g of each sediment sample were extracted by sonication (3 x 15 min) using dichloromethane:methanol (2:1 v/v; 30 ml) as solvent. Prior to biomarker extraction two ...