Source Appointment of Carbon-Containing Aerosols based on Multi-wavelength Continuous Monitoring

Objective To investigate the source of carbon-containing aerosol by monitoring the concentration of carbon-containing aerosol in multiple wavebands based on optical technology.

Methods During December 16-18, 2019, a miniature multi-band aerosol monitoring instrument was used to continuously monitor the mass concentration of carbon-containing aerosol in Jinan of Shandong province, China.

Results From 9 a.m. December 16 to 4 a.m. December 17, the Absorption Exponent (AAE, α) gradually decreased from greater than 1.5 to about 1, indicating that the main aerosol source in this monitoring period gradually changed from biomass combustion to motor vehicle combustion. the α value fluctuated around 1 from 4 a.m. to 12 a.m. December 17, indicating that the main aerosol source in this monitoring period was motor vehicle combustion. from 12 a.m. December 17 to 3 a.m. December 18, the α value gradually increased from 1 to about 2, indicating that the main aerosol source in this monitoring period gradually changed from motor vehicle combustion to biomass combustion.

Conclusion The main source of carbon-containing aerosol changes with time, mainly from motor vehicle combustion in daytime and biomass combustion at night.