Fig. 1. The map of study areas and locations of sampling site.
Fig. 2. The correlation matrices of observed variables.
Fig. 3. The variations of CO2 net atmospheric flux (NAF) during the monitoring period.
Fig. 4. The boxplots of comparison for (a) kg and (b) CO2 NAF for each equations
Fig. 5. Correlation matrices of water velocity and CO2 NAF.
Fig. 6. Bi-plots of PCA results
Fig. 7. The partial dependence plots showing the marginal effects of a single variable on NAF
Fig. 8. The comparison of performances of the best SMLR and RF models
Table 1. The ranges of pCO2 in streams and rivers reported in previous studies
Table 2. The location of sampling sites
Table 3. Water quality conditions of the study sites during the study period
Table 4. The description statistics of the observed weirs variables
Table 5. The summary statistics of estimated CO2 NAF for each weir
Table 6. The comparison of the CO2 NAF estimated in this study with previous studies
Table 7. The description statistics of summary statistics of kg and CO2 NAF for different gas transfer velocityEquations
Table 8. Subset regression variables that best matched the performance criterion of weirs
Table 9. The best SMLR models and parsimonious RF models for estimating CO2 NAF for each weir
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