Down-core geochemical data from Disko 2 lake sediment core (West Greenland) collected in April 2013

• Main Authors: Stevenson, Mark A, McGowan, Suzanne, Pearson, Emma J, Swann, George E A, Leng, Melanie J, Jones, Vivienne J, Bailey, Joseph J, Huang, Xianyu, Whiteford, Erika
• Format: Dataset
• Language: English
• Published: PANGAEA 2021
• Subjects: 24-Methylcholesta-5,22E-dien-3beta-ol/sum sterols; Accumulation rate; carbon; per year; dry mass; Accumulation rate per year; Age; standard error; Americium-241; error; Arctic; beta-Carotene; per unit mass total organic carbon; Caesium-137; Calculated; Calculated after Bourbonniere and Meyers; 1996: (C27+C29+C31)/(C15+C17+C19); Calculated after Matsuda and Koyama; 1977: 0.5*((C12+C14+C16)+(C22+C24+C26+C28+C30))+((C14+C16+C18)+(C24+C26+C28+C30+C32))/((C13+C15+C17)+(C23+C25+C27+C29 +C31)); Calculated after Zheng et al.; 2007; Calculation according to Marzi et al. (1993); organic; total; Carbon/Nitrogen ratio; carbon isotope analysis; Carbon Preference Index; n-Alkanoic acids; Carbon Preference Index 2; n-Alkanes ((C23+C25+C27 )+(C25+C27+C29))/2*(C24+C26+C28); Coupled gas chromatography/mass spectrometry (GC/MS) on an Agilent Technologies 7890A GC linked to 5795C MS triple axis mass detector; equipped with a HP DB5-MS column; CRS model (Constant Rate of Supply); D2-K1-2013; Depth; bottom/max; sediment/rock; top/min; Disko Bay; Greenland; Disko Island; Dry mass per area
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.927276; https://doi.org/10.1594/PANGAEA.927276

Lake sediment samples were taken in April 2013 from the ice by drilling through lake ice and recovering an undisturbed core using a HON-Kajak sediment corer. Samples were analysed for pigments (University of Nottingham), carbon isotopes and C/N ratios (BGS, Keyworth), lipid biomarkers (Newcastle University) and compound-specific carbon isotopes (CUG, Wuhan). The purpose of the analyses was to develop an environmental reconstruction of carbon cycling for an upland lake (named Disko 2) to encompass the Little Ice Age to recent warming climate periods. Analyses were completed as part of Mark A. Stevenson's PhD research while based at the University of Nottingham, UK (Stevenson, 2017, http://eprints.nottingham.ac.uk/46579). ²¹⁰Pb, ²²⁶Ra, ¹³⁷Cs and ²⁴¹Am concentrations were measured by direct gamma assay in the Environmental Radiometric Facility at University College London (Dr Handong Yang), using an ORTEC HPGe GWL series well-type coaxial low background intrinsic germanium detector. Radiometric dating techniques follow Appleby et al, 1986 (doi:10.1007/BF00026640), Appleby et al, 1992 (doi:10.1016/0168-583X(92)95328-O) and Appleby, 2001 (doi:10.1007/0-306-47669-X_9) with core extrapolation and linear interpolation used to derive an age depth model to the base of the core. The pigment β-carotene was analysed on an Agilent 1200 series high-performance liquid chromatography (HPLC) using separation conditions outlined in McGowan et al., 2012 (doi:10.1111/j.1365-2427.2011.02689.x). Bulk δ¹³C and C~org~/N ratios were analysed on acidified samples using a Costech ECS4010 elemental analyser (EA) coupled to a VG Triple Trap and a VG Optima dual-inlet mass spectrometer. Key lipid biomarkers (n-alkanes, n-alkanoic acids (as fatty acid methyl esters (FAMEs), n-alkanols and sterols) were analysed using an Agilent 7890A GC coupled to a 5975C MS according to Pearson et al., 2007 (doi:10.1016/j.orggeochem.2007.02.007) and are expressed as ratios, relative to the total of each compound class. Specific ratios were also calculated for ...