Stable isotopes in recent biogenic carbonates from Lake Locknesjön, Sweden collected in 2018

This dataset presents measurements of stable isotopes in biogenic carbonates (δ13C and δ18O) from Lake Locknesjön, Sweden. Carbonate samples were collected in 2018 from different lacustrine organisms along a water depth gradient from 0 to 8 m depth: encrustations from the calcifying algae Chara hispida, valves from the bivalve mollusk Pisidium sp., and valves from two species of ostracods, Candona candida and Candona neglecta. Adult specimen and different juvenile stages of the ostracods were sampled. The carbonate samples originate from living organisms, i.e. which were alive at the time of sampling in 2018, and from their subfossil remains in the uppermost centimeter of the lake sediments. The carbonate samples were collected by a diving team. Carbonate isotope measurements were carried out at MARUM, Bremen, Germany, using a ThermoFisher Scientific 253plusgas isotope ratio mass spectrometer with a Kiel IV automated carbonate preparation device. The standard deviation of the reference standards over the measurement period was 0.06‰ for δ18O and 0.03‰ for δ13C.

本数据集收录了瑞典洛克讷松湖（Lake Locknesjön）中生物成因碳酸盐（biogenic carbonates）的稳定同位素（δ13C与δ18O）测定数据。2018年，研究团队沿0至8米的水深梯度，采集了多种湖生生物（lacustrine organisms）体内的碳酸盐样品：包括钙化藻类（calcifying algae）糙轮藻（Chara hispida）形成的钙结壳、双壳类软体动物（bivalve mollusk）豌豆螺属（Pisidium sp.，未定种）的壳瓣，以及两种介形类（ostracods）——白色坎顿介（Candona candida）与疏忽坎顿介（Candona neglecta）的壳瓣。此外还采集了介形类的成体标本及不同发育阶段的幼体标本。本次采集的碳酸盐样品既来自2018年采样时仍存活的活体生物，也采自湖泊沉积物最上层1厘米中的亚化石（subfossil）残骸。所有碳酸盐样品均由潜水团队完成采集。碳酸盐同位素测定工作在德国不来梅海洋环境科学中心（MARUM）开展，使用赛默飞世尔科技（ThermoFisher Scientific）的253 Plus型气体同位素比值质谱仪（253plusgas isotope ratio mass spectrometer）搭配Kiel IV型自动化碳酸盐制备装置（Kiel IV automated carbonate preparation device）完成。测量周期内参考标准的标准差为：δ18O为0.06‰，δ13C为0.03‰。