Geochemical measurements of Holocene sediment sequence retrieved from Lake Loitsana, Finland@en

This dataset provides geochemical measurements for the Holocene sediment sequence retrieved from Lake Loitsana (Finland) in 2008. The data are presented as percentages (Corg, N), ‰ vs PDB (δ13Corg) and ‰ vs air (δ18O). All parameters are presented against both depth (cm) and age (cal yr. BP). Two age/depths models are presented: the first model represents the original age/depth model applied to the records (Shala et al., 2014; 2017) and the second age/depth model, which is the author-preferred version, presents updated age-estimates derived using the r package 'Bacon' (Blaauw and Christensen, 2011). The geochemical dataset provides information on Holocene lake ecosystem and catchment dynamics. A total of 144 samples from the Holocene sediment sequence were freeze-dried, ground and weighed into tin capsules for C/N-analysis. Additional material was taken from each sample for organic carbon (Corg) analysis. The material was weighed into silver capsules, treated with HCL (10%) and dried overnight before analysis. Concentrations were measured through combustion in a Carlo Erba NC2500 Elemental Analyzer at the Stable Isotope Lab at the Department of Geological Sciences, Stockholm University.本数据集提供了2008年从芬兰洛伊察纳湖（Lake Loitsana）获取的全新世（Holocene）沉积序列的地球化学测量数据。 数据以百分比形式（有机碳（Corg）、全氮（N））、相对于PDB标准的千分比值（δ¹³Corg）以及相对于空气的千分比值（δ¹⁸O）展示。所有参数均以深度（单位：厘米，cm）与校准距今年代（cal yr BP）为关联变量进行展示。 本数据集包含两套年代-深度模型：第一套为应用于该沉积记录的原始年代-深度模型（Shala等，2014；2017）；第二套为作者推荐的最优版本，通过R语言包'Bacon'（Blaauw与Christensen，2011）计算得到更新后的年代估算结果。 该地球化学数据集可用于解析全新世湖泊生态系统与流域动态变化。研究人员从该全新世沉积序列中选取共计144份样品，经冷冻干燥、研磨后称取至锡胶囊中，用于碳氮（C/N）分析。每份样品还取额外等分试样用于有机碳（Corg）分析：称取该部分试样至银胶囊中，经10%盐酸（HCl）处理后过夜干燥，随后进行分析测试。 样品浓度通过燃烧法在斯德哥尔摩大学地质科学系稳定同位素实验室的Carlo Erba NC2500元素分析仪上完成测定。