Tank et al. Dissolved C flux from circumboreal catchments Table S1: Results of the regression analyses shown in Fig. 4. In all cases, the independent variable is the contribution of groundwater flux to total discharge. The dependent variable is as noted. r indicates the analysis of the residuals of the daily model results. LEGEND: JN: June AU: August INT: Intercept COEFF: Coefficient p: p-value VARIABLE JN_INT JN_COEFF JN_p AU_INT AU_COEFF AU_p Permafrost 73.616 -1.874 0.017 77.958 -1.638 0.003 HCO3-, r -5.556 0.646 0.082 -1.984 0.351 0.081 HCO3-:DOC, r -0.673 0.119 0.283 -2.217 0.281 0.009 DOC, r 2.295 -0.855 0.112 1.574 -0.397 0.131