Mass and isotopic concentrations of water-insoluble refractory carbon in total suspended particulates at Mt. Waliguan Observatory (China)

- Weekly variations of WIRC mass concentrations were agreeable with those of aethalometer BC.
- WIRC mass concentrations were higher than those of aethalometer BC.
- WIRC δ13C PDB was (−25.3 ± 0.8)‰ (n = 79) with little seasonality.
- WIRC 14C pMC ((67.2 ± 7.7)%, n = 29) provided signatures of different air mass transport paths.