Publication Date:
2024-04-26
Description:
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.
Keywords:
Alas lake; Archaeol per unit sediment mass; Arctic; AWI Arctic Land Expedition; Biomarkers; Calculated; Carbon, organic, total; Carbon, 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; DEPTH, sediment/rock; Depth, 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; n-Alkane, total per unit sediment mass; Nitrogen, total; PETA-CARB; pH, porewater; pH, soil; Rapid Permafrost Thaw in a Warming Arctic and Impacts on the Soil Organic Carbon Pool; RCDT; RU-Land_2015_CentralYakutia_Yuke; Sample ID; Sum branched glycerol dialkyl glycerol tetraether, per unit sediment mass; talik; thawed permafrost; thermokarst lake; Truck mounted rotary drill; WTW MultiLab 540; Yedoma deposits; Yedoma lake; YUK15-YU-L15; YUK15-YU-L7
Type:
Dataset
Format:
text/tab-separated-values, 294 data points
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