ALBERT

Description: We present the full compilation of δO2/N2 and δ18O of O2 data measured in the gas phase on the EPICA Dome C ice core from 1420 m to the bottom (3191 m), hence covering the last 800 kyr. The EPICA Dome C ice core has been drilled in Antarctica (-75.1°S; 123.395°E; 3233 m elevation) between 1996 and 2004 and measurements were performed from 2001 to 2022. Some of the data were already presented in previous published studies (Dreyfus et al., 2007, 2008; Landais et al., 2012; Bazin et al., 2016; Extier et al., 2018) but corrections were performed in the present data file. The new highly-resolved datasets have been measured over five glacial terminations (TII, III, IV, V and VI) by Grisart (2023) using a dual inlet Delta 219 V plus (Thermo Electron Corporation) mass spectrometer at the LSCE. They are combined to previous published data to obtain the final compilation of the δ18O of O2 and δO2/N2 records covering the last 800 kyr.

Description: Oxygen and hydrogen isotope data were obtained in water samples collected in the Laptev Sea along the 130.5E meridian in route 63 of R/V "Akademik Mstislav Keldysh" in 2015 and in route 69 of R/V "Akademik Mstislav Keldysh" in 2017. Sampling was done using the Rosette SBE 32. Isotope analysis was performed in the laboratory of Isotope Geochemistry and Geochronology of IGEM RAS (Moscow) in 2015-2016 (for route 63) and in 2017 (for route 69). Oxygen isotope composition of water samples determined by CF IRMS using the Delta V+ with the GasbenchII option (Thermo, Germany). Hydrogen isotope composition of water samples determined by DI IRMS using the DeltaPlus with H/Device option (Thermo, Germany). The δD and δ¹⁸O values were determined with an accuracy of 0.3 and 0.05 per mill correspondently.

Description: Oxygen, hydrogen, and carbon isotope data with the [DIC] concentrations were analyzed in water samples collected in the East Siberian Sea along the Kolyma and Indigirka sub-meridian profile in route 69 of R/V "Akademik Mstislav Keldysh" in 2017. Sampling was done using the Rosette SBE 32. Isotope analysis was performed in the laboratory of Isotope Geochemistry and Geochronology of IGEM RAS (Moscow) in 2017. Oxygen isotope composition of water samples determined by CF IRMS using the Delta V+ with the GasbenchII option (Thermo, Germany). Hydrogen isotope composition of water samples determined by DI IRMS using the DeltaPlus with H/Device option (Thermo, Germany). The δD and δ¹⁸O values were determined with an accuracy of 0.3 and 0.05 per mill correspondently. The δ¹³C(DIC) and DIC concentrations were analyzed using the Delta V+ with the GasbenchII option (Thermo, Germany). The δ¹³C(DIC) and [DIC] values were determined with an accuracy of 0.05 per mill and 5 rel. % correspondently.

Description: Hydrogen isotope composition of aquatic (mid-chain n-alkenes, C20-HBIs, C37-alkenones) and terrestrial (long-chain n-alkanes) biomarker groups were analysed in core H7 from Hala Hu, China. The lake is located on the northern margin of the Tibetan Plateau (97.24 - 97.47°E, 38.12 - 38.25°N, 4078 m above sea level), along the modern marginal zone between the Asian Summer Monsoon (ASM) and westerlies influences. The core was drilled at the deepest point (65 m) of the lake and extends from 212 to 636 cm sediment depth. According to the age-model (Yan et al., 2020) the covered time period is 7462 - 23610 cal yr BP. After quantification of compounds, for separate δD-analysis of n-alkanes and n-alkenes, the non-polar aliphatic fraction was further split chromatographically into a saturated and unsaturated fraction, using aluminum-coated silicagel as stationary phase and hexane and DCM as solvents. To obtain sufficient amounts for isotope analysis, in some cases several samples have been merged, especially in the older section of the core. Compound specific hydrogen isotope values were then obtained by using gas chromatography isotope ratio mass spectrometry (GC-IRMS). We used a Thermo Scientific® Trace GC equipped with a Restek RTX-5 column (30 m, inner diameter 0.25 mm, film thickness 0.25 μm). The GC was connected via a GC Isolink with high temperature combustion furnace (1400 °C) and a Conflo IV interface to a Delta V Plus isotope ratio mass spectrometer. The δD values of the alkenones were determined by a GC/Thermal Conversion/isotope ratio monitoring mass spectrometer (GC-TC-irMS). For this a GC, equipped with a CPsil 5 CB column (25 meters, 0.32 mm inner diameter, film thickness 0.4 μm) was coupled to a GC-isolink I via a Conflo IV to a Thermo Electron DELTA V mass spectrometer.

Description: Hydrogen isotope composition of aquatic (mid-chain n-alkenes, C20-HBIs, C37-alkenones) and terrestrial (long-chain n-alkanes) biomarker groups were analysed in core H11 from Hala Hu, China. The lake is located on the northern margin of the Tibetan Plateau (97.24 - 97.47°E, 38.12 - 38.25°N, 4078 m above sea level), along the modern marginal zone between the Asian Summer Monsoon (ASM) and westerlies influences. The core was drilled at the deepest point (65 m) of the lake and extends from 0 to 212 cm sediment depth. According to the age-model (Yan et al., 2020) the covered time period is modern - 9216 cal yr BP. For separate δD-analysis of n-alkanes and n-alkenes, after quantification the non-polar aliphatic fraction was further split chromatographically into a saturated and unsaturated fraction, using aluminum-coated silicagel as stationary phase and hexane and DCM as solvents. Compound specific hydrogen isotope values were then obtained by using gas chromatography isotope ratio mass spectrometry (GC-IRMS). We used a Thermo Scientific® Trace GC equipped with a Restek RTX-5 column (30 m, inner diameter 0.25 mm, film thickness 0.25 μm). The GC was connected via a GC Isolink with high temperature combustion furnace (1400 °C) and a Conflo IV interface to a Delta V Plus isotope ratio mass spectrometer. The δD values of the alkenones were determined by a GC/Thermal Conversion/isotope ratio monitoring mass spectrometer (GC-TC-irMS). For this a GC, equipped with a CPsil 5 CB column (25 meters, 0.32 mm inner diameter, film thickness 0.4 μm) was coupled to a GC-isolink I via a Conflo IV to a Thermo Electron DELTA V mass spectrometer.