Lithogenic particle flux to the subantarctic Southern Ocean: a multi-tracer estimate using sediment trap samples (publication data)

This dataset contains temporal and compositional data on the Southern Ocean Time Series (SOTS) 1000 m depth sediment trap between 2010 and 2019. This study has added new data on 40 trace metals and isotopes (TEIs) in addition to the sinking particle flux data available on the Australian Ocean Data Network (AODN portal) and published in Wynn-Edwards et al. (2020; Frontiers in Earth Science). The TEI data was collected by strong acid digestion of archived SOTS 1000 m sinking particle samples collected from sediment trap deployments from 2010 to 2019. Following digestion, sinking particle samples were analysed for TEI concentration at the UTAS Central Science Laboratory using High Resolution Inductively Coupled Plasma Mass Spectrometry (HR-ICP-MS). The data presented here contains TEI concentration data, elemental fluxes calculated from the sediment trap mass fluxes (Wynn-Edwards et al., 2020) and a range of lithogenic particle fluxes derived from various upper continental crust concentrations reported in the literature. Several iterations of lithogenic flux are included for key lithogenic tracers Al, Fe, Ti and Th, with some mean fluxes of the combination of these tracers included. Here, several multi-tracer lithogenic fluxes are included based on the inclusion of Th concentrations using isotope dilution or linear calibration methods.

The final lithogenic fluxes used in the publication are linearly calibrated Al, Ti, Fe and Th flithogenic fluxes and the mean value of these four tracers. Additional V and Pb tracer concentrations were used to assess anthropogenic influences. These results were used to estimate seasonal and interannual lithogenic particle flux in the subantarctic Southern Ocean. Additionally, particle composition, sources and provenance were examined using the attached data. The findings were used to provide an estimate of dust deposition in the subantarctic Southern Ocean south of Australia, contextualised by particle trajectory reanalysis, satellite data products and biogeochemical processes.

本数据集包含2010至2019年间南大洋时间序列（Southern Ocean Time Series, SOTS）1000米深度沉积物捕获器的时序与组分数据。本研究在澳大利亚海洋数据网络（Australian Ocean Data Network, AODN 门户）公开且Wynn-Edwards等人（2020；《地球科学前沿（Frontiers in Earth Science）》）已发表的沉降粒子通量数据基础上，新增了40种痕量金属与同位素（trace metals and isotopes, TEIs）的相关数据。
痕量金属与同位素数据通过对2010至2019年沉积物捕获器部署期间获取的存档SOTS 1000米沉降粒子样品进行强酸消解完成采集。消解完成后，使用高分辨率电感耦合等离子体质谱（High Resolution Inductively Coupled Plasma Mass Spectrometry, HR-ICP-MS），在塔斯马尼亚大学（University of Tasmania, UTAS）中央科学实验室对样品的TEI浓度进行分析。本数据集涵盖TEI浓度数据、基于沉积物捕获器质量通量计算得到的元素通量（Wynn-Edwards等，2020），以及一系列基于文献报道的不同上陆壳浓度推导的陆源颗粒通量。针对关键陆源示踪剂铝（Al）、铁（Fe）、钛（Ti）和钍（Th），本数据集提供了多组陆源通量计算结果，并包含部分由这些示踪剂组合得到的平均通量。此外，还提供了基于同位素稀释法或线性校准法引入钍浓度得到的多示踪剂陆源通量。
本研究最终采用的陆源通量为经线性校准的铝、钛、铁、钍陆源通量，以及这四种示踪剂的平均值。额外收录的钒（V）和铅（Pb）示踪剂浓度数据，用于评估人为活动的影响。上述结果被用于估算亚南极南大洋的陆源颗粒通量季节与年际变化。此外，本数据集附带的数据还被用于分析颗粒的组成、来源与成因。研究结果还被用于估算澳大利亚以南亚南极南大洋的粉尘沉降量，并结合粒子轨迹再分析数据、卫星数据产品与生物地球化学过程对该估算结果进行了情境化阐释。