Concentration of dissolved organic carbon in water samples taken from the Upper Clark Fork River (Montana, USA) during water year 2023 (1 Oct 2022 - 30 Sep 2023)

The Upper Clark Fork River (UCFR) Long Term Research in Environmental Biology (LTREB) umbrella monitoring project generating these data is conducted separately and complementarily to the 200-million-dollar (USD) superfund project for ecological restoration of the UCFR, associated tributaries, and head water streams including Silver Bow and Warm Springs Creeks. Restoration along the UCFR in western Montana includes removal of metal-laden floodplain soils, lowering of the floodplain to its original elevation, and re-vegetation of over 70 km of the river’s floodplain closest to contaminant sources. The UCFR LTREB project includes bi-weekly water quality monitoring across the first 200 km of the river and its major tributaries along a gradient of heavy metal contamination associated with historic mining. Monitoring includes inorganic phosphorus and nitrogen concentrations, biotic standing stocks, and dissolved and whole-water heavy metal concentrations. The monitoring program began in 2017 with funding extended through 2028. The original analytical intent for these data was to assess the response of river dissolved organic carbon to the floodplain restoration. Data are total organic carbon combustion analyses (Shimadzu Scientific Instruments) of the concentration of organic carbon dissolved in filtered samples of well-mixed river thalweg water. Data are from the 2023 water year (1 Oct 2022 to 30 Sep 2023) from samples collected on the Upper Clark Fork River (USGS HUC 17010201) at project sites distributed along the river from the vicinity of Anaconda to Missoula, Montana, USA.

本数据集源自克拉克福克河上游（Upper Clark Fork River, UCFR）长期环境生物学研究（Long Term Research in Environmental Biology, LTREB）综合监测项目，该项目与针对UCFR、相关支流及西尔弗鲍克溪、沃姆斯普林斯溪等源头溪流开展生态修复的2亿美元（美元）超级基金项目（superfund project）并行实施、互为补充。蒙大拿州西部UCFR沿岸的修复工作包括移除携带有重金属的河漫滩土壤、将河漫滩恢复至原始高程，以及对紧邻污染源的70余公里河漫滩进行植被重建。UCFR LTREB项目覆盖河流前200公里及其主要支流的每两周一次的水质监测，监测区域沿与历史采矿活动相关的重金属污染梯度分布，监测指标涵盖无机磷、氮浓度，生物现存量，以及溶解态与全水体重金属浓度。本监测项目始于2017年，资助期限已延长至2028年。本数据集最初的分析目标是评估河流溶解有机碳对河漫滩修复工程的响应，数据采用燃烧法通过岛津科学仪器（Shimadzu Scientific Instruments）对混匀的河流深槽水过滤样品中的溶解有机碳浓度进行总有机碳分析得到，数据集来自2023水文年（2022年10月1日至2023年9月30日），采样点位于美国蒙大拿州从阿纳康达周边到米苏拉沿线的克拉克福克河上游（美国地质调查局水文单元编码USGS HUC 17010201）项目监测区域。