Multispectral absorbance and fluorescence analysis of dissolved organic carbon in water samples taken from the Upper Clark Fork River (Montana, USA) during water years 2017 and 2018 (1 Oct 2016 - 30 Sep 2018)

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 likely to be 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 multispectral absorbance and fluorescence analyses of organic carbon dissolved in samples of well-mixed river thalweg water. Data include excitation-emission matrices, absorbance spectroscopy, as well as absorbance and fluorometric summary indices calculated at specific wavelengths of excitation and emission. Data are from the 2017 and 2018 water years (1 Oct 2016 to 30 Sep 2018). Data were collected on the Upper Clark Fork River (USGS HUC 17010201) at 13 project sites distributed along the river from the vicinity of Anaconda to Missoula, Montana, USA. These data are a correction of a previously published data product (doi:10.6073/pasta/6ba30f4ebb63175a4399c5d0aa6a8698). Inconsistencies between availability of EEMS data, absorbance data, and fluorometric summary metrics have been corrected. Part of resolving these inconsistencies included correcting the year on a limited number of the records in the fluorometric summary metric table.

本数据集源自克拉克福克河上游（Upper Clark Fork River, UCFR）环境生物学长期研究（Long Term Research in Environmental Biology, LTREB）综合监测项目，该项目与耗资2亿美元（美元计价）的克拉克福克河及其附属支流、源头溪流（含银鲍溪与暖春溪）生态修复超级基金项目（superfund）独立开展且互为补充。蒙大拿州西部克拉克福克河沿岸的修复工作包括移除富含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余公里河岸带进行植被重建。克拉克福克河上游LTREB项目对河流首段200公里流域及其主要支流开展每两周一次的水质监测，监测区域覆盖与历史采矿活动相关的重金属污染梯度带。监测指标涵盖无机磷、氮浓度，生物现存量，以及溶解态与全水相重金属浓度。该监测项目于2017年启动，资助期限有望延长至2028年。本数据集最初的分析目标为评估河流溶解有机碳（dissolved organic carbon）对河漫滩修复工程的响应。数据集包含对充分混匀的河流深槽水体样本中溶解有机碳的多光谱吸光度与荧光光谱分析结果，具体包括激发-发射矩阵（excitation-emission matrices）、吸光度光谱，以及在特定激发与发射波长下计算得到的吸光度与荧光汇总指数。数据集涵盖2017与2018水文年度（2016年10月1日至2018年9月30日）的监测数据。数据采集于美国蒙大拿州境内从阿纳康达周边至米苏拉的克拉克福克河上游（USGS HUC 17010201）的13个监测点位。本数据集是对此前已发布数据集（DOI:10.6073/pasta/6ba30f4ebb63175a4399c5d0aa6a8698）的修正版本。此前激发-发射矩阵数据、吸光度数据与荧光汇总指标之间的可用性不一致问题已得到修正，解决此类不一致性的工作包括修正荧光汇总指标表中少量记录的年份信息。