Biogeochemical parameters of thawed sediments underneath a Yedoma and Alas thermokarst lake in Eastern Siberia

• Main Authors: Jongejans, Loeka Laura, Liebner, Susanne, Knoblauch, Christian, Mangelsdorf, Kai, Strauss, Jens
• Format: Dataset
• Language: English
• Published: PANGAEA 2021
• Subjects: Alas lake; Archaeol per unit sediment mass; Arctic; AWI Arctic Land Expedition; Biomarkers; Calculated; Carbon; organic; total; Carbon and nitrogen and sulfur (CNS) element analyzer; Elementar; Vario MAX; Carbon in Permafrost / Kohlenstoff im Permafrost; Carbon Preference Index; n-Alkanes; Central_Yakutia_Yukechi_2015; Central Yakutia; CLICCS; Cluster of Excellence: Climate; Climatic Change; and Society; Core; Depth; bottom/max; sediment/rock; top/min; Element analyser (calculated by TC-TIC); Event label; Gas chromatograph-mass spectrometer; GC-MS; greenhouse gas production; Isoprenoid acyclic glycerol dialkyl glycerol tetraether per unit sediment mass; KoPF; Liquid chromatography-mass spectrometry (LC-MS); n-Alkane; average chain length; total per unit sediment mass; Nitrogen; PETA-CARB; pH; porewater; soil; Rapid Permafrost Thaw in a Warming Arctic and Impacts on the Soil Organic Carbon Pool; permafrost; Thermokarst; Yakutia; Siberia
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.928132; https://doi.org/10.1594/PANGAEA.928132

This dataset describes two 17 m long sediment cores taken from beneath two thermokarst lakes in the Yukechi Alas, Central Yakutia, Russia. The first core was taken from below an Alas thermokarst lake (YU-L7; 61.76397°N, 130.46442°E) and the second core below and Yedoma lake (YU-L15; 61.76086°N, 130.47466°E). The dataset presents biogeochemical and biomarker parameters of sediment cores YU-L7 and YU-L15. Biogeochemical analyses include total carbon (TC) content, total organic carbon (TOC) content, total nitrogen (TN) content. Biomarker parameters include the n-alkane concentration, average chain length (ACL), carbon preference index (CPI), brGDGT concentration, archaeol concentration and the isoGDGT-0 concentration. The n-alkanes were measured in the aliphatic fraction by gas chromatography-mass spectromety using a Trace GC Ultra coupled to a DSQ MS. The branched and isoprenoid glycerol dialkyl glycerol tetraethers, as well as the dialkyl glycerol diether lipid (archaeol) were measured in the NSO fraction using a Shimadzu LC-10AD high-performance liquid chromatograph coupled to a Finnigan TSQ 7000 mass spectrometer via an atmospheric pressure chemical ionization interface. The pH soil is the sediment pH which was assessed by adding 6.12 mL of 0.01 M CaCl~2~ to ~2.5 g dried sediment and measuring with a Multilab 540 (WTW) at 20°C.