Fig. 3: Relationship between R_s, R_h, R_a, and atmospheric CO₂ increment.

a Interannual variation of R_s and atmospheric CO₂ increment; (b) Scatter plot with fitted line of R_s and atmospheric CO₂ increment; (c) Interannual variation of R_h and atmospheric CO₂ increment; (d) Scatter plot with fitted line of R_h and atmospheric CO₂ increment. e Interannual variation of R_a and atmospheric CO₂ increment; (f) Scatter plot with fitted line of R_a and atmospheric CO₂ increment. Anomaly calculations were performed on R_s, R_h, and atmospheric CO₂ increment to eliminate differences in magnitude.