Recent reports indicate that the absorption enhancement of black carbon (BC) and brown carbon (BrC)
particles is determined by the evolution of morphology and mixing state during the atmospheric processing.
In this study, laboratory-generated BC-BrC mixture particles (BC-BrC) were exposed to sulfuric
acid, ammonia/triethylamine, and water vapor sequentially to investigate the alteration in light absorption,
morphology and mixing state during simulated atmospheric processing.