Berg, Sonja; Kusch, Stephanie; Jivcov, Sandra (2024): Alkanoic acid composition of marine and terrestrial sedimentary archives from sub-Antarctic South Georgia [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.967441, In: Berg, S et al. (2024): Alkyl lipid distribution, elemental composition and compound-specific 14C isotope composition in marine and terrestrial sedimentary archives from sub-Antarctic South Georgia [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.967394
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Abstract:
The dataset comprises alkanoic acids 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. To purify alkanoic acids, the remaining TLE was acidified to pH 1 and acids were extracted from the TLE with dichloromethane by liquid-liquid phase separation. Prior to analysis by gas chromatography (GC, Agilent 7890B, Agilent Technologies, USA) equipped with a flame ionization detector (FID), alkanoic acids were converted to methyl ester derivatives. Alkanoic acids were identified and quantified against authentic external standards. Concentrations are given as fractional abundances for the compound class.
Related to:
Berg, Sonja; et al. (accepted): Alkyl lipid distributions and compound-specific 14C isotope compositions in diverse sedimentary archives in sub-Antarctic South Georgia: Deconvolving (past and present) marine and terrestrial sources and revealing localized export dynamics in response to environmental change.
Project(s):
Funding:
German Research Foundation (DFG), grant/award no. 463250038: Integrating terrestrial and marine sediment records from East Antarctica to explore late Pleistocene and Holocene ice sheet instability
German Research Foundation (DFG), grant/award no. 5472008: Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas
Coverage:
Median Latitude: -54.194631 * Median Longitude: -36.572256 * South-bound Latitude: -54.215333 * West-bound Longitude: -36.592600 * North-bound Latitude: -54.187100 * East-bound Longitude: -36.538000
Date/Time Start: 2013-04-01T00:00:00 * Date/Time End: 2013-04-11T00:00:00
Minimum Elevation: -198.1 m * Maximum Elevation: 76.0 m
Event(s):
Co1305 * Latitude: -54.192900 * Longitude: -36.591100 * Date/Time: 2013-04-01T00:00:00 * Elevation: -19.6 m * Recovery: 11.04 m * Campaign: ANT-XXIX/4 (PS81) * Basis: Polarstern * Method/Device: Piston corer, UWITEC (PCUWI)
Co1306 * Latitude: -54.188500 * Longitude: -36.578610 * Elevation: 2.0 m * Campaign: ANT-XXIX/4 (PS81) * Basis: Polarstern * Method/Device: Russian peat corer and gravity corer
Co1308 * Latitude: -54.192000 * Longitude: -36.544750 * Elevation: 24.0 m * Campaign: ANT-XXIX/4 (PS81) * Basis: Polarstern * Method/Device: Russian peat corer and gravity corer
Parameter(s):
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
2927 data points
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