Biomarker indices and concentrations and biomarker-based temperature estimates from the Iberian Margin core MD95-2042 ...
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 te...
Main Authors: | , |
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Format: | Dataset |
Language: | English |
Published: |
PANGAEA
2023
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Subjects: | |
Online Access: | https://dx.doi.org/10.1594/pangaea.957182 https://doi.pangaea.de/10.1594/PANGAEA.957182 |
Summary: | 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; ... |
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