Supplemental tables for a study of the seasonal Impacts of the Physical Environment on Biogeochemical Cycles in Arctic Lakes of the Mackenzie River Delta ...

• Main Author: Wheat, Charles Geoffrey
• Format: Dataset
• Language: English
• Published: Zenodo 2023
• Subjects: Arctic, lakes, OsmoSampler, diagenesis, solute transport, Mackenzie River, Manganese, Iron; Arctic; Inuvik; Mackenzie River; Mackenzie river
• Online Access: https://dx.doi.org/10.5281/zenodo.7974988; https://zenodo.org/record/7974988

submitted abstract We conducted two- and six-year-long deployments of continuous water samplers (OsmoSamplers) and sensors (Temperature, pressure, light level, dissolved oxygen (DO) and conductivity) in nine lakes within the mid- to outer-delta region of the Mackenzie River and documented biogeochemical fluctuations (Mn, Fe, sulfate, and DO), defined physical processes that that drive such fluctuations, and constrained the impact of lake solutes on annual riverine fluxes. Five lakes were in the mid-delta region near Inuvik, NT, two lakes were in the outer delta, and two lakes were on the Arctic coastal plain and were not impacted by the Mackenzie River. In general, temperature minima occurred in September/October, indicative of ice formation, and distinct hydrostatic pressure (water level) anomalies occurred in May/June associated with ice breakup, lasting for days to months and impacting lake levels up to 4.2 m higher than “normal”. Such anomalies coincide with a dramatic change in solute concentrations. ... : Three Key points 140 maximum characters with spaces) 1. Continuous water samplers and sensors constrain physical forcing and oxygen inputs that affect biogeochemical processes in Arctic lakes. 2. Once dissolved oxygen is removed, dissolved Mn then Fe are released to lake waters; eventually sulfate removal occurs in most lakes. 3. Lake solutes (Mn and Fe) can affect yearly riverine fluxes if increases in concentration prior to spring floods are greater than 10 fold. ...