Radionuclide (210Pb, 137Cs) and mercury measurements from short sediment cores (multicorer) taken during ALKOR cruises AL557 and AL561, Skagerrak@en

Six short sediment cores (<50cm) were collected using a Multicorer on the continental margin of the Skagerrak between 434 - 677 meter water depth. The sediment cores were retrieved during two research cruises with the RV Alkor, the cruise Al557 from 4th to 23rd of June 2021 and the cruise AL561 from 2nd to 13th of August 2021. Sediment samples were analysed for lead-210 (210Pb) and caesium-137 (137Cs) by gamma spectrometry, fraction modern carbon-14 (F14C) using the MICADAS micro-scale Accelerator Mass Spectrometer, and mercury (Hg) using a Direct Mercury Analyzer DMA-80 evo. The dataset was used to setup an age-depth model covering the last 120 years to determine the temporal variability in sedimentation rates in the Skagerrak.本研究在斯卡格拉克海峡大陆边缘434~677米水深区间内，采用多管采样器（Multicorer）采集了6根长度小于50厘米的短沉积物岩芯。上述岩芯由阿尔科尔号科考船（RV Alkor）在两次科考航次中获取：分别为2021年6月4日至23日执行的Al557航次，以及2021年8月2日至13日执行的AL561航次。研究团队对沉积物样品开展了多项分析：采用γ能谱法（gamma spectrometry）测定铅-210（lead-210, ²¹⁰Pb）与铯-137（caesium-137, ¹³⁷Cs）的活度；利用MICADAS微型加速器质谱仪（micro-scale Accelerator Mass Spectrometer）测试现代碳分馏比值（F¹⁴C）；采用直接测汞仪DMA-80 evo检测汞（mercury, Hg）的含量。本数据集被用于构建覆盖过去120年的年龄-深度模型，以解析斯卡格拉克海峡沉积速率的时间变化特征。