TY - JOUR
T1 - Seasonal variations of mass absorption efficiency of elemental carbon in PM2.5 in urban Guangzhou of South China
AU - Pei, Chenglei
AU - Wu, Yunfei
AU - Tao, Jun
AU - Zhang, Leiming
AU - Zhang, Tao
AU - Zhang, Runqi
AU - Li, Sheng
N1 - Publisher Copyright:
© 2022
PY - 2023/11
Y1 - 2023/11
N2 - This study investigates seasonal variations of mass absorption efficiency of elemental carbon (MAEEC) and possible influencing factors in urban Guangzhou of South China. Mass concentrations of elemental carbon (EC) and organic carbon (OC) in PM2.5 and aerosol absorption coefficient (bap) at multi-wavelengths were simultaneously measured in four seasons of 2018–2019 at hourly resolution by a semi-continuous carbon analyzer and an aethalometer. Seasonal average mass concentrations of EC were in the range of 1.36–1.70 μgC/m3 with a lower value in summer than in the other seasons, while those of OC were in the range of 4.70–6.49 μgC/m3 with the lowest value in summer and the highest in autumn. Vehicle exhaust from local traffic was identified to be the predominant source of carbonaceous aerosols. The average aerosol absorption Ångström exponents (AAE) were lower than 1.2 in four seasons, indicating EC and bap were closely related with vehicle exhaust. Seasonal MAEEC at 550 nm was 11.0, 8.5, 10.4 and 11.3 m2/g in spring, summer, autumn, and winter, respectively. High MAEEC was related with the high mass ratio of non-carbonaceous aerosols to EC and high ambient relative humidity.
AB - This study investigates seasonal variations of mass absorption efficiency of elemental carbon (MAEEC) and possible influencing factors in urban Guangzhou of South China. Mass concentrations of elemental carbon (EC) and organic carbon (OC) in PM2.5 and aerosol absorption coefficient (bap) at multi-wavelengths were simultaneously measured in four seasons of 2018–2019 at hourly resolution by a semi-continuous carbon analyzer and an aethalometer. Seasonal average mass concentrations of EC were in the range of 1.36–1.70 μgC/m3 with a lower value in summer than in the other seasons, while those of OC were in the range of 4.70–6.49 μgC/m3 with the lowest value in summer and the highest in autumn. Vehicle exhaust from local traffic was identified to be the predominant source of carbonaceous aerosols. The average aerosol absorption Ångström exponents (AAE) were lower than 1.2 in four seasons, indicating EC and bap were closely related with vehicle exhaust. Seasonal MAEEC at 550 nm was 11.0, 8.5, 10.4 and 11.3 m2/g in spring, summer, autumn, and winter, respectively. High MAEEC was related with the high mass ratio of non-carbonaceous aerosols to EC and high ambient relative humidity.
KW - Absorption enhancement
KW - Non-carbonaceous aerosols
KW - Relative humidity
KW - Vehicle exhaust
UR - http://www.scopus.com/inward/record.url?scp=85146343012&partnerID=8YFLogxK
U2 - 10.1016/j.jes.2022.04.019
DO - 10.1016/j.jes.2022.04.019
M3 - Article
C2 - 37451792
AN - SCOPUS:85146343012
SN - 1001-0742
VL - 133
SP - 83
EP - 92
JO - Journal of Environmental Sciences (China)
JF - Journal of Environmental Sciences (China)
ER -