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. Source-specific optical properties of light-absorbingcarbonaceous (LAC) aerosols in the atmosphere are poorly understood becausethey are generated by various sources. In this study, a receptor modelcombining multi-wavelength absorption and chemical species was used toexplore the source-specific optical properties of LAC aerosols in a tropicalmarine monsoon climate zone. The results showed that biomass burning andship emissions were the dominant contributors to average aerosol lightabsorption. The source-specific absorption Ångströmexponent (AAE) indicated that black carbon (BC) was the dominant LAC aerosolin ship and motor vehicle emissions. Moreover, brown carbon (BrC) waspresent in biomass-burning emissions. The source-specific mass absorptioncross section (MAC) showed that BC from ship emissions had a strongerlight-absorbing capacity compared to emissions from biomass burning andmotor vehicles. The BrC MAC derived from biomass burning was also smallerthan the BC MAC and was highly dependent on wavelength. Furthermore,radiative effect assessment indicated a comparable atmospheric forcing andheating capacity of LAC aerosols between biomass burning and ship emissions.This study provides insights into the optical properties of LAC aerosolsfrom various sources. It also sheds more light on the radiative effects ofLAC aerosols generated by ship emissions.

atmospheric chemistry and physics

Optical source apportionment and radiative effect of light-absorbing carbonaceous aerosols in a tropical marine monsoon climate zone: the importance of ship emissions