Figure 6

Comparison of ∆¹³C (=δ¹³C_observed − δ¹³C_{source-predicted}) versus ∆¹⁴C of WSOC and WIOC at Beijing and KCOG. ∆¹³C denotes the difference in δ¹³C between δ¹³C signals of observed and source mixture predicted by MCMC simulations for each WSOC (or WIOC) sample (that is, ∆¹³C = δ¹³C_observed − δ¹³C_{source-predicted}). The dual-isotope signatures of the original sources are marked by grey shade (dark grey and light grey represent 1σ and 2σ numerical spread, respectively), including coal, fossil fuel, and biomass/biogenic sources. The δ¹³C source endmember databases are found in Table S3.