Excess 210Pb, 137C, total organic carbon content, HBI biomarkers (IPSO25, HBI III) and biogenic silica of marine deposits from sediment core 2018_R2_2F from Sheldon Cove, Antarctic Peninsula

Description: Sediment core 2018_R2_2F was collected from Sheldon Cove, Antarctic Peninsula (67.55°S 68.27°W) from a water depth of 177 m, in December 2018 as part of expedition JR18003 by the British Antarctic Survey aboard RV James Clark Ross (Sands et al. 2019). Total core length was 25 cm. The dataset presented here consists of: gamma spectrometry measurements of excess 210Pb (calculated as a difference between the total 210Pb and the average of 214Pb and 214Bi) and 137Cs; total organic carbon (TOC) content; biogenic silica (BSi) content; and HBI biomarker (IPSO25, HBI III) concentrations. The excess 210Pb and 137Cs were measured at the Institute of Geology at Adam Mickiewicz University in Poznań, Poland, using a gamma detector Canberra BE3830, cooled with cryostat Cryo-Pulse®5 plus. The detector is placed in 10 cm thick lead shield walls and is equipped with a remote detector chamber option (RDC-6 inches) for low energy background reduction. The detector was commercially characterized by ISOCS (In-Situ Object Calibration Software) and LabSOCS (Laboratory Sourceless Object Calibration Software). Efficiencies for measured geometries were determined using LabSOCS code applying all corrections for sample geometry, matrix, and container type, and were verified with IAEA standards measurements. The results (spectra) were analyzed in Canberra GENIE-2000 v. 3.3 gamma spectrometry software and are presented with 2-sigma uncertainty ranges (Szczuciński, submitted). TOC concentrations (given in %) were measured at the Faculty of Earth Sciences, University of Silesia, Poland, using an Eltra CS-500 IRanalyzer with a Total Inorganic Carbon module according to the procedure described in Racka et al. (2010). TOC was calculated as the difference between TC (total carbon) and TIC (total inorganic carbon). Each TOC sample was analysed in duplicate. Analytical precision and accuracy were better than ±2% for TC and ±3% for TIC. HBI biomarker preparation and analysis followed slightly modified (Pieńkowski et al. 2021) standard protocols (Belt 2012). HBI concentrations are given per weight of sediment (ng/g sed), and organic carbon content (μg/g OC) (Belt et al. 2012). Biogenic (opaline) silica (BSi) analysis on dried, homogenised samples followed Heiri et al. (2001) and Bechtel et al. (2007). Each BSi and TOC sample was analysed in duplicate; values are given in %. BSi and TOC standard deviation calculations are based on data from the replication. References * Bechtel, A., Woszczyk, M., Reischenbacher, D., Sachsenhoffer, R., Gratzer, R., Püttmann, W. Spychalski, W., 2007: Biomarkers and geochemical indicators of Holocene environmental changes in Lake Sarbsko (Poland). Org. Geoch. 38, 1112–1131. * Belt, S.T., Brown, T.A., Navarro Rodriguez, A., Cabedo Sanz, P., Tonkin, A., Ingle, R. 2012. A reproducible method for the extraction, identification and quantification of the Arctic sea ice proxy IP25 from marine sediments. Anal. Methods 4, 705-713. * Heiri, O., Lotter, A. F., Lemcke, G., 2001. Loss on ignition as a method for estimating organic and carbonate content in sediments: reproducibility and comparability of results. J. Paleolimnol. 25, 101-110. * Pieńkowski, A.J., Husum, K., Belt, S.T., Ninnemann, U., Köseoğlu, D., Divine, D.V., Smik, L., Knies, J., Hogan, K., Noormets, R. 2021. Seasonal sea ice persisted through the Holocene Thermal Maximum at 80°N. Commun. Earth Environ. 2, 124. * Racka, M., Marynowski, L., Filipiak, P., Sobstel, M., Pisarzowska, A., Bond, D.P.G., 2010: Anoxic Annulata events in the Late Famennian of the Holy Cross Mountains (Southern Poland): geochemical and palaeontological record. Palaeogeography, Palaeoclimatology, Palaeoecology 297(3-4), 549-575. * Sands, C.J., Annett, A., Apeland, B., Barnes, D.K.A, Bascur, M., Bruning, P., Costa, M., Dadd, G., De Lecea, A., Ensor, N., Featherstone, A., Flint, G., Goodger, D., Guzzi, A., Howard, F., Hunter, D., Jenkins, S., Kender, S., Lincoln, B., Munoz-Ramirez C., Pienkowski, A., Retallick, K., Roman-Gonzalez, A., Scourse, J., Sheen, K., Whitaker, T., Williams, J., Zhao, L., Zwerschke, N., 2019: JR18003 Cruise Report. British Antarctic Survey, 132 pp. * Szczuciński, W. (submitted): Applications of gamma-emitting isotopes (210Pb and 137Cs) for assessment of sedimentary processes – insights from studies of lake, deltaic and continental shelf deposits. Projects * CHARME: CHanging AntaRctic Marine Environments, Web: https://charme.amu.edu.pl/, Award: Norwegian Financial Mechanism 2014-2021, UMO-2020/37/K/ST10/04127 File descriptions: Excel file with all data, as well as core details (coordinates and water depth). Comment: This dataset is related to the following article which has been accepted for publication: Pieńkowski, Anna J.; Szczuciński, Witold; Breszka, Agnieszka; Chyleński, Maciej; Juras, Anna; Romel, Paulina; Rozwalak, Piotr; Trzebny, Artur; Dabert, Mirosława; Belt, Simon; Jagodziński, Robert; Smik, Lukas; Włodarski, Wojciech. Sedimentary ancient DNA and HBI biomarkers as sea-ice indicators: a complementary approach in Antarctic fjord environments. Limnology Oceanography Letters. doi: 10.1002/lol2.10395

描述：2018_R2_2F号沉积物岩芯于2018年12月随英国南极调查局（British Antarctic Survey）JR18003科考航次，搭乘詹姆斯·克拉克·罗斯号（RV James Clark Ross）科考船采自南极半岛谢尔顿湾（Sheldon Cove，67.55°S 68.27°W），水深177米处（Sands等，2019）。岩芯总长度为25厘米。
本数据集包含以下测定数据：过量²¹⁰Pb（以总²¹⁰Pb与²¹⁴Pb、²¹⁴Bi的平均值之差计算）和¹³⁷Cs的γ能谱测量结果、总有机碳（total organic carbon, TOC）含量、生物成因二氧化硅（biogenic silica, BSi）含量，以及HBI生物标志物（IPSO25、HBI III）浓度。
过量²¹⁰Pb与¹³⁷Cs的测定由波兰波兹南亚当·密茨凯维奇大学地质研究所完成，使用配备Cryo-Pulse®5 plus低温冷却装置的Canberra BE3830型γ探测器。该探测器置于10厘米厚的铅屏蔽墙内，并配备远程探测室选件（RDC-6英寸）以降低低能本底。探测器通过ISOCS（原位物体校准软件，In-Situ Object Calibration Software）与LabSOCS（实验室无源物体校准软件，Laboratory Sourceless Object Calibration Software）完成商业化标定。采用LabSOCS程序对测定几何条件的效率进行计算，校正了样品几何、基质与容器类型的所有影响，并通过国际原子能机构（IAEA）标准样品测量进行验证。测定结果（能谱）通过Canberra GENIE-2000 v.3.3 γ能谱分析软件处理，结果以2σ不确定度范围表示（Szczuciński，已投稿）。
总有机碳浓度（以百分比计）由波兰西里西亚大学地球科学学院完成测定，采用配备总无机碳模块的Eltra CS-500型红外分析仪，参照Racka等（2010）所述方法操作。总有机碳以总碳（total carbon, TC）与总无机碳（total inorganic carbon, TIC）的差值计算。每个TOC样品均进行平行双样分析，总碳的分析精密度与准确度优于±2%，总无机碳则优于±3%。
HBI生物标志物的制备与分析参照经微调的标准流程（Pieńkowski等，2021；原标准见Belt，2012）。HBI浓度以沉积物干重计（ng/g 沉积物），有机碳含量以μg/g 有机碳计（Belt等，2012）。
对干燥均质化样品的生物成因（蛋白石质）二氧化硅（BSi）分析参照Heiri等（2001）与Bechtel等（2007）的方法。每个BSi与TOC样品均进行平行双样分析，结果以百分比计。BSi与TOC的标准差基于平行样数据计算得到。
参考文献
* Bechtel, A., Woszczyk, M., Reischenbacher, D., Sachsenhoffer, R., Gratzer, R., Püttmann, W., Spychalski, W., 2007：波兰萨尔布斯科湖全新世环境变化的生物标志物与地球化学指标. 《有机地球化学》38, 1112–1131.
* Belt, S.T., Brown, T.A., Navarro Rodriguez, A., Cabedo Sanz, P., Tonkin, A., Ingle, R. 2012：海洋沉积物中北极海冰代用指标IP25的提取、鉴定与定量可重复方法. 《分析方法》4, 705-713.
* Heiri, O., Lotter, A. F., Lemcke, G., 2001：烧失量法估算沉积物中有机碳与碳酸盐含量：结果的重现性与可比性. 《古湖沼学杂志》25, 101-110.
* Pieńkowski, A.J., Husum, K., Belt, S.T., Ninnemann, U., Köseoğlu, D., Divine, D.V., Smik, L., Knies, J., Hogan, K., Noormets, R. 2021：80°N区域全新世暖期仍存在季节性海冰. 《地球环境通讯》2, 124.
* Racka, M., Marynowski, L., Filipiak, P., Sobstel, M., Pisarzowska, A., Bond, D.P.G., 2010：波兰圣十字山脉晚法门期的缺氧Annulata事件：地球化学与古生物学记录. 《古地理学、古气候学、古生态学》297(3-4), 549-575.
* Sands, C.J. 等, 2019：JR18003科考航次报告. 英国南极调查局, 132页.
* Szczuciński, W.（已投稿）：γ发射同位素（²¹⁰Pb与¹³⁷Cs）在沉积过程评估中的应用——来自湖泊、三角洲与大陆架沉积研究的启示.
研究项目 * CHARME：南极海洋环境变化（CHanging AntaRctic Marine Environments），网址：https://charme.amu.edu.pl/，资助编号：挪威金融机制2014-2021年项目，UMO-2020/37/K/ST10/04127
文件说明：包含全部数据及岩芯详细信息（坐标与水深）的Excel文件。
备注：本数据集与以下已录用待发表论文相关：Pieńkowski, Anna J.; Szczuciński, Witold; Breszka, Agnieszka; Chyleński, Maciej; Juras, Anna; Romel, Paulina; Rozwalak, Piotr; Trzebny, Artur; Dabert, Mirosława; Belt, Simon; Jagodziński, Robert; Smik, Lukas; Włodarski, Wojciech. 沉积古DNA与HBI生物标志物作为海冰指示剂：南极峡湾环境中的互补研究方法. Limnology Oceanography Letters. doi: 10.1002/lol2.10395