Russian river total suspended solids (TSS), mercury in TSS, and drivers of long-term trends, 1974-2018

This project investigates long-term trends in total suspended solids (TSS) and mercury in TSS (i.e., particulate mercury, PHg) from 1974–2018 in eight major Russian rivers within the pan-Arctic watershed. River water samples were collected approximately monthly from the near-surface (0–0.5 m) and processed following clean techniques for analysis of trace metals. Laboratory procedures followed standard methods and were consistent through the duration of the study. Measurements of TSS and PHg concentration together with published observations on daily river discharge were used to estimate annual TSS and PHg concentrations and flux magnitudes, and the trends of each, using the United States Geological Survey weighted regressions on time, discharge, and season (WRTDS) modeling approach (Hirsch et al., 2010; doi:10.1111/j.1752-1688.2010.00482.x). Full methodological details, including statistical analyses and quality-assurance / quality-control, can be found in the manuscript associated with these data: "Multi-decadal declines in particulate mercury and sediment export from Russian rivers in the pan-Arctic basin", by Scott Zolkos et al.本项目聚焦泛北极流域内的8条俄罗斯主要河流，探究了1974—2018年间总悬浮颗粒物（total suspended solids, TSS）及其结合态汞（即颗粒态汞，particulate mercury, PHg）的长期变化趋势。研究人员按月于近表层（0~0.5米）水域采集河流水样，并采用洁净分析技术开展痕量金属相关实验。实验室分析流程遵循标准方法，且在整个研究周期内保持统一。随后结合实测的TSS与PHg浓度数据，以及已公开的每日河流径流量观测资料，采用美国地质调查局提出的时间-径流量-季节加权回归（weighted regressions on time, discharge, and season, WRTDS）建模方法（Hirsch等，2010；doi:10.1111/j.1752-1688.2010.00482.x），估算了年际TSS与PHg浓度及通量规模，并分析了二者的变化趋势。本数据集完整的方法学细节（含统计分析与质量保证/质量控制流程）可参阅配套学术论文：《泛北极盆地俄罗斯河流颗粒态汞与沉积物输出的数十年衰减趋势》（作者：Scott Zolkos等）。