Publikationsdatum:
2024-01-19
Beschreibung:
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 TEX86, 0.238 for GDGT-2/GDGT-3, and 0.010 (0.26 °C) for UK′37. RI-OH′-SST estimates are from the following global calibration: SST = (RI-OH′ + 0.029)/0.0422 (Fietz et al., 2020). RI-OH-SST estimates are from the following global calibration: SST = (RI-OH − 1.11)/0.018 (Lü et al., 2015). TEX86H-SST estimates are from the following regional paleocalibration: SST = 68.4 × TEX86H + 33.0 (Darfeuil et al., 2016). UK′37-SST estimates are from the following global calibration: SST = 29.876 × UK′37 − 1.334 (Conte et al., 2006). Bayesian calibrations were also used for TEX86-SST and TEX86-subT estimates (BAYSPAR; Tierney & Tingley, 2014, 2015) and for UK′37-SST estimates (BAYSPLINE; Tierney & Tingley, 2018). Alkenone data covering the 160–70 and 70–0 ka BP periods are from Davtian et al. (2021) and Darfeuil et al. (2016), respectively. GDGT data covering the 160–45 ka BP period are from Davtian et al. (2021). The age model of core MD95-2042 for the 160–43 and 43–0 ka BP periods was obtained by tuning to Chinese speleothems (Cheng et al., 2016) and by recalibrating existing 14C ages with the Marine20 calibration curve (Heaton et al., 2020), respectively. MIS, Marine Isotope Stage; GDGT, glycerol dialkyl glycerol tetraether; and N/A, not available.
Schlagwort(e):
AGE; air temperature; Alkenone, C37:3+C37:2; Alkenone, unsaturation index UK'37; Alkenones; Antarctica; Calculated according to Lü et al. (2015); Calculated according to Schouten et al. (2002); Calculated after Conte et al. (2006); Calculated from TEX86 (Tierney and Tingley, 2014, 2015); Calculated from UK37 (Prahl and Wakeham, 1987); CALYPSO; Calypso Corer; Comment; d18O; DEPTH, sediment/rock; Dicyclic glycerol dialkyl glycerol tetraether/Tricyclic glycerol dialkyl glycerol tetraether ratio; GDGTs; Greenland; Hydroxylated acyclic glycerol dialkyl glycerol tetraether; Hydroxylated glycerol dialkyl glycerol tetraethers; Hydroxylated monocyclic glycerol dibiphytanyl glycerol tetraether; Iberian margin; IMAGES; IMAGES I; International Marine Global Change Study; Isoprenoid glycerol dialkyl glycerol tetraethers; Marge Ibérique; Marine isotope stage; Marion Dufresne (1995); MD101; MD952042; MD95-2042; Ring index of hydroxylated glycerol dialkyl glycerol tetraethers; RI-OH; Sample code/label; Sea surface temperature; Sea surface temperature, annual mean; SST, from Ri OH-GDGTs, Fietz et al. (2020); SST, from RI-OH Lü et al. (2015); SST, from TEXH86, Darfeuil et al. (2016); SST, from UK'37, BAYSPLINE (Tierney and Tingley, 2018); Sub-surface temperature; Taylor et al. (2013); Tetraether index of 86 carbon atoms; Tetraether index of 86 carbon atoms of isoprenoid glycerol dialkyl glycerol tetraether; TEX86; UK'37
Materialart:
Dataset
Format:
text/tab-separated-values, 21514 data points
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