Sub-decadal diatom oxygen isotope record of the last 220 years (2015-1790CE) of sediment short core EN18232-1 from Lake Khamra, SW Yakutia, Siberia, Russia@en

The dataset includes diatom oxygen isotope data for 39 samples from short core EN18232-1, Lake Khamra, and corresponding key geochemical characteristics of the purified lake sediment samples based on Energy-Dispersive X-ray Spectroscopy (EDS) measurements. For each sample (Sample ID) the corresponding core depth (Depth sed top/bottom) and the calculated mean age (Age) are given. EDS measurements were carried out by a JEOL M-IT500HR analytical scanning electron microscope (SEM) with an integrated EDS-system supplied with a Peltier element cooled SD detector (SDD) at AWI Potsdam. The standardless procedure was used according to Chapligin et al. (2012), including 6 repetitions, acceleration voltage of 20.0 kV, magnification of 300 and a measuring time of 30 seconds. All detectable elements are normalized to 100% weight. Elements are given as oxides with weight percentages (in %) and summed up to the total sum (total %) of each sample. The diatom oxygen isotope data was generated in the ISOLAB Facility at AWI Potsdam with a semi-automated laserfluorination line (Chapligin et al., 2010) in combination with a SERCON HS2022 mass spectrometer (https://hdl.handle.net/10013/sensor.4880f572-3c55-4e3e-a2e7-485d9bfa06b2). All δ18Odiatom values are given in per mill (‰) vs. Vienna Standard Mean Ocean Water (VSMOW). The dataset includes the mean of measured δ18Odiatom values (Diatom δ18O mean), the standard deviation (Diatom δ18O std dev) and number of replicates (Repl), as well as the calculated contamination (Contamination in %) and the δ18Odiatom corrected for contamination (Diatom δ18O corrected). Details of the contamination correction and isotope analytics are given in Stieg et al. (2024).本数据集涵盖堪拉湖（Lake Khamra）短岩芯EN18232-1的39份样品的硅藻氧同位素数据，以及基于能量色散X射线光谱（Energy-Dispersive X-ray Spectroscopy, EDS）测量获得的纯化湖底沉积物样品关键地球化学特征。针对每份样品（样品编号Sample ID），均给出对应岩芯深度（沉积物顶/底深度Depth sed top/bottom）与计算得到的平均年龄（Age）。 EDS测量由波茨坦阿尔弗雷德·魏格纳研究所（AWI Potsdam）的JEOL M-IT500HR型分析型扫描电子显微镜（SEM）完成，该设备搭载集成EDS系统与佩尔捷制冷硅漂移探测器（SDD）。测量采用无标样流程，遵循Chapligin等人2012年的研究方法，包含6次重复测量，加速电压为20.0 kV，放大倍数为300倍，单次测量时长为30秒。所有可检测元素均归一化至100%重量占比，元素以氧化物形式给出重量百分比（%），并汇总得到每份样品的总重量占比（总%）。 硅藻氧同位素数据由波茨坦阿尔弗雷德·魏格纳研究所ISOLAB实验室采用半自动激光氟化系统（Chapligin等，2010）结合SERCON HS2022型质谱仪完成测试（测试链接：https://hdl.handle.net/10013/sensor.4880f572-3c55-4e3e-a2e7-485d9bfa06b2）。所有δ¹⁸O_硅藻值均以相对于维也纳标准平均海水（Vienna Standard Mean Ocean Water, VSMOW）的千分比（‰）表示。数据集包含实测δ¹⁸O_硅藻值的平均值（Diatom δ¹⁸O mean）、标准偏差（Diatom δ¹⁸O std dev）、重复测量次数（Repl），以及计算得到的污染校正率（污染占比%）和经污染校正后的δ¹⁸O_硅藻值（Diatom δ¹⁸O corrected）。污染校正与同位素分析的详细方法参见Stieg等人2024年的研究成果。