Records of biogenic carbon parameter concentrations from sediment core GeoB19927-3 during the Holocene

The dataset contains concentrations of bioproductivity parameters from sediment samples from sediment core GeoB19927-3 (73°35,26' N, 58°05,66' W) located in Southern Melville Bay (Baffin Bay). The dataset covers the depth interval between 760-0 cm top depths, corresponding to 7.7 kyrs BP – present. The core was taken at 932 meters of water depth by gravity coring during cruise MSM44 in 2015 (Dorschel et al., 2015). The core consists of 1147 cm of sediment. The chronology has been provided by Saini et al. (2020). Excess lead is present down to 4.5 cm core depth, indicating that the core top is of recent age and only experienced minor disturbance during coring. In the upper 25 cm, the sampling for palynology was made at 1 cm interval, which corresponds to a temporal resolution of 30 years. Within the 25 cm to 280 cm interval every 5 cm and within the 280 cm to 760 cm interval every 10 cm were sub-sampled for palynology and all other analysis. Palynology sample processing followed the procedure for palynological preparation described in Vernal et al. (2010). The taxonomy of dinocysts used here was based on Rochon et al. (1999) and de Vernal et al. (2020). Organic linings of foraminifera were counted on the basis of the marker-grains method (Matthews, 1969) by adding a capsule of Lycopodium clavatum spores. Only complete linings were considered. For foraminifera analysis between 4-16 grams of freeze-dried sediment samples were wet sieved over a 63 µm mesh sieve and oven-dried at ~50 °C for one day. The whole fraction > 63 µm was picked and counted for planktonic and benthic foraminifers. Planktonic and benthic specimens and their fragments were sorted into two groups and separately weighed to six decimal places using a Sartorius microbalance. Each sample was weighed five times to determine the average weight of their accumulative shells. Benthic samples were analysed with attention given to the five species yielding acid-resistant organic linings (B. elegantissima, M. zandamee, E. excavatum, C. lobatulus, C. wuellerstorfi).

该数据集包含来自沉积物岩心GeoB19927-3（北纬73°35.26′，西经58°05.66′）的沉积物样本中生物生产力参数的浓度，该岩心位于巴芬湾（Baffin Bay）南部的梅尔维尔湾区域。数据集覆盖顶部以下760-0厘米的深度区间，对应距今7.7千年至现代。该岩心于2015年MSM44航次期间通过重力取心（gravity coring）在932米水深处获取（Dorschel等，2015），总长1147厘米。年代学数据由Saini等（2020）提供。过剩铅（excess lead）存在于岩心深度4.5厘米以下，表明岩心顶部为近期形成，且取心过程中仅受到轻微扰动。在上部25厘米区间，孢粉学（palynology）采样间隔为1厘米，对应时间分辨率为30年；25厘米至280厘米区间每5厘米进行一次子采样，280厘米至760厘米区间每10厘米进行一次子采样，这些子样本用于孢粉学及其他所有分析。孢粉样本处理遵循Vernal等（2010）描述的孢粉制备流程。本研究使用的沟鞭藻囊孢（dinocysts）分类学基于Rochon等（1999）和de Vernal等（2020）的成果。有孔虫（foraminifera）的耐酸有机壁通过添加石松（Lycopodium clavatum）孢子胶囊，采用标记颗粒法（marker-grains method，Matthews，1969）进行计数，仅统计完整的壁结构。针对有孔虫分析，取4-16克冻干沉积物样本通过63微米筛网进行湿筛，随后在约50°C烘箱中干燥一天；将>63微米的全部分级挑出，计数浮游及底栖有孔虫。浮游与底栖有孔虫标本及其碎片被分为两组，使用赛多利斯（Sartorius）微量天平（microbalance）分别称重至小数点后六位；每个样本称重五次以确定其累积壳体的平均重量。底栖样本分析重点关注五种可产生耐酸有机壁的物种：B. elegantissima、M. zandamee、E. excavatum、C. lobatulus、C. wuellerstorfi。