Alkanol composition of marine and terrestrial sedimentary archives from sub-Antarctic South Georgia

• Main Authors: Berg, Sonja, Kusch, Stephanie, Jivcov, Sandra
• Format: Dataset
• Language: English
• Published: PANGAEA 2024
• Subjects: alkanols; ANT-XXIX/4; Area/locality; Calculation according to Marzi et al. (1993); Calculation according to Poynter & Eglinton (1990); Carbon Preference Index; n-Alkanols; Co1305; Co1306; Co1308; Cruise/expedition; DATE/TIME; Depth; bathymetric; bottom/max; sediment/rock; top/min; Docosanol of total fatty alcohols; DW-SG_062; DW-SG_063; DW-SG_064; Eicosanol of total fatty alcohols; ELEVATION; Event label; fjord; Gas chromatography - Flame Ionization Detection (GC-FID); GC; Gravity corer; Heneicosanol of total fatty alcohols; Heptacosanol of total fatty alcohols; Heptadecanol of total fatty alcohols; Hexacosanol of total fatty alcohols; Hexadecanol of total fatty alcohols; lake; LATITUDE; LONGITUDE; n-Alkanol average chain length; Nonadecanol of total fatty alcohols; Octacosanol of total fatty alcohols; Octadecanol of total fatty alcohols; PCUWI; peat; Pentacosanol of total fatty alcohols; Piston corer; UWITEC; Polarstern; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas; Arctic; Antarctic; Fid; Poynter; in Berg; Antarc*; Sea ice
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.967408; https://doi.org/10.1594/PANGAEA.967408

The dataset comprises alkanol composition data that was obtained on sediment samples from sub-Antarctic South Georgia. The sediments were collected from a range of different sites, including lakes, peat deposits, a marine inlet and a fjord during RV Polarstern expedition PS81 in 2013. Prior to the geochemical analyses reported here, the sediments were freeze-dried and ground. More details on the study sites, sampling and data evaluation can be found in Berg et al. (submitted manuscript). Alkyl lipid biomarkers were extracted by accelerated solvent extraction (ASE 300, Thermo, USA) with dichloromethane and methanol (DCM, MeOH; 9:1, v/v at 120°C, 75 bar) (cores Co1305, PS81/283, and Co1308) or via consecutive ultrasonication in DCM:Hexan (1:1), MeOH:DCM (1:1) and MeOH (core Co1306 and the peat and soil samples). The total lipid extract (TLE) was saponified with 0.5 M KOH in MeOH and water (9:1, v/v) at 80°C for 2 h. Neutral lipids (NL) were extracted from the TLE with dichloromethane by liquid-liquid phase separation. Alkanes were purified from NL by silica gel column chromatography (SiO2, deactivated, mesh-size 60) by elution with hexane and alkanols by elution with chloroform. Prior to analysis by gas chromatography (GC, Agilent 7890B, Agilent Technologies, USA) equipped with a flame ionization detector (FID), alkanols were acetylated. Alkanols were identified and quantified against authentic external standards. Concentrations are given as fractional abundances for the compound class.