Biomarker indices and concentrations and biomarker-based temperature estimates from the Iberian Margin core MD95-2042 ...

• Main Authors: Davtian, Nina, Bard, Edouard
• Format: Dataset
• Language: English
• Published: PANGAEA 2023
• Subjects: air temperature; Alkenones; Antarctica; d18O; GDGTs; Greenland; Iberian margin; RI-OH; Sea surface temperature; TEX86; UK'37; Sample code/label; DEPTH, sediment/rock; AGE; Marine isotope stage; Hydroxylated glycerol dialkyl glycerol tetraethers; Hydroxylated acyclic glycerol dialkyl glycerol tetraether; Hydroxylated monocyclic glycerol dibiphytanyl glycerol tetraether; Ring index of hydroxylated glycerol dialkyl glycerol tetraethers; Sea surface temperature, annual mean; Isoprenoid glycerol dialkyl glycerol tetraethers; Tetraether index of 86 carbon atoms of isoprenoid glycerol dialkyl glycerol tetraether; Tetraether index of 86 carbon atoms; Sub-surface temperature; Dicyclic glycerol dialkyl glycerol tetraether/Tricyclic glycerol dialkyl glycerol tetraether ratio; Alkenone, C373+C372; Alkenone, unsaturation index UK'37; Comment; Calypso Corer; Calculated according to Lü et al. 2015; SST, from Ri OH-GDGTs, Fietz et al. 2020; SST, from RI-OH Lü et al. 2015; Calculated according to Schouten et al. 2002; SST, from TEXH86, Darfeuil et al. 2016; Calculated from TEX86 Tierney and Tingley, 2014, 2015; Taylor et al. 2013; Calculated from UK37 Prahl and Wakeham, 1987; Calculated after Conte et al. 2006; SST, from UK'37, BAYSPLINE Tierney and Tingley, 2018; MD101; Marion Dufresne 1995; International Marine Global Change Study IMAGES; Antarc*
• Online Access: https://dx.doi.org/10.1594/pangaea.957182; https://doi.pangaea.de/10.1594/PANGAEA.957182

This dataset provides the following information for core MD95-2042: depth, age, summed OH-GDGT, iGDGT, and di-unsaturated and tri-unsaturated C37 alkenone concentrations, OH-GDGT-based, iGDGT-based, and alkenone-based paleothermometric indices, GDGT-2/GDGT-3 ratio, and biomarker-based sea surface temperature (SST) and 0‐ to 200‐m sea temperature (subT; gamma function probability distribution for target temperatures with a = 4.5 and b = 15) estimates. Sediment samples were taken every 5 cm from core MD95-2042 and homogenized before lipid extraction. The lipid extracts were splitted into two fractions: one for alkenone analysis by gas chromatography coupled to a flame ionization detector, and the other for GDGT analysis by high-performance liquid chromatography coupled to mass spectrometry. All GDGT analyses were done in duplicate. The 1σ analytical uncertainties from 37 replicate analyses of the core catcher sample from core MD95-2042 are 0.007 (0.4 °C) for RI-OH, 0.008 (0.2 °C) for RI-OH′, 0.003 (0.2 °C) for ... : The age model has been defined by 14C dating (14C ages calibrated using Marine20 calibration curve, Heaton et al., 2020 Radiocarbon, https://doi.org/10.1017/RDC.2020.68) and two additional tie points for the 0–43 ka BP period and by synchronization to the Chinese speleothem record by Cheng et al. (2016) Nature (https://doi.org/10.1038/nature18591) for the 43–160 ka BP periodRI-OH′ stands for 'Ring Index of hydroxylated tetraethers with OH-GDGT-0' (Lü et al., 2015 OG; https://doi.org/10.1016/j.orggeochem.2015.10.004)Annual SSTs were calculated from RI-OH′ following Fietz et al. (2020) Oceanography (https://doi.org/10.5670/oceanog.2020.207)RI-OH stands for 'Ring Index of hydroxylated tetraethers without OH-GDGT-0' (Lü et al., 2015 OG; https://doi.org/10.1016/j.orggeochem.2015.10.004)Annual SSTs were calculated from RI-OH following Lü et al. (2015) OG (https://doi.org/10.1016/j.orggeochem.2015.10.004)TEX86 stands for 'TetraEther indeX of tetraethers consisting of 86 carbon atoms' (Schouten et al., 2002 EPSL; ...