Geochemical data collected in river water and shallow groundwater in a subarctic region (Matane river, QC, Canada)

This study aims to quantify groundwater discharges and associated DIC and CO2 fluxes at a high- and low- resolution scales on the Matane River (Qc, Canada). The flux calculations were based on a dataset including radon-222 activities (i.e., 222Rn), and measurements of dissolved inorganic carbon (i.e., DIC), total alkalinity, CO2 partial pressure (i.e., PCO2), and pH. The low-resolution study was undertaken at the corridor scale (07/2017), while the high-resolution study focused on a ~800 m long meander reach (08/2017). At the corridor scale, for the 12 sampling points, river water was analyzed in a riffle and in a pool to better represent river sections. Groundwater was also sampled from 4 private wells and in 2 piezometers for the corridor scale study, and from 12 piezometers inserted into the 18 ha meander floodplain for the meander scale study.

本研究旨在量化加拿大魁北克省马塔讷河（Matane River）不同低、高分辨率尺度下的地下水排放量，以及与之伴生的溶解无机碳（dissolved inorganic carbon, DIC）与二氧化碳（CO₂）通量。通量计算基于包含氡-222（radon-222, ²²²Rn）活度、溶解无机碳（DIC）、总碱度、二氧化碳分压（CO₂ partial pressure, PCO₂）及pH值的数据集。
低分辨率研究于廊道尺度开展（2017年7月），而高分辨率研究则聚焦于一段长约800米的河曲河段（2017年8月）。在廊道尺度下，针对12个采样点，研究人员分别对浅滩与深潭处的河水进行分析，以更具代表性地刻画河道断面特征。该尺度研究还采集了4口私人水井与2个测压管的地下水样品；而河曲尺度研究则从嵌入18公顷河曲漫滩的12个测压管中采集了地下水样品。