Fig. 3: CH4 fluxes from different sources and relationship between total CH4 emissions and groundwater inflow rates.
From: Groundwater discharge as a driver of methane emissions from Arctic lakes
a Inputs of CH4 to the study lakes are groundwater inflow and inlet streams, while outputs are emissions to the atmosphere (Atm flux) (by diffusion (Diff) and ebullition (Ebull)) and outlet streams. Box plots for groundwater CH4 inputs were generated by considering median values reported at each lake for each season. The boundaries of each box plot indicate the 25th and 75th percentiles of these fluxes, and the solid line in each box marks the median. Different lower-case letters indicate differences between water sources. The data used to generate the box plots is represented with gray circles. b In summer, as groundwater inflow rates increase, higher atmospheric CH4 emissions are found. The solid line represents the linear regression between total CH4 emissions and groundwater inflow rates (y = (6.5 ± 1.7) x + (0.1 ± 6.2), df = 8, F = 15, p < 0.005). The shaded area represents 95% confidence intervals.
