The transport of bioaerosols observed by wideband integrated bioaerosol sensor and coherent Doppler lidar.

Bioaerosols, usually defined as aerosols derived from biological systems, including bacteria, fungi, and viruses, play an important role in atmospheric physical and chemical processes, such as ice nucleation and cloud condensation. Thus their transport affects regional climate change and public health. Lidar is an effective technique for aerosol detection and pollution monitoring as well as profiling the vertical distribution of wind vectors. In this paper, a coherent Doppler wind lidar (CDWL) was deployed for wind and aerosol detection in Hefei, China, from 11 March to 20 March in 2020. A wideband integrated bioaerosol sensor (WIBS) was deployed to monitor the local fluorescent bioaerosol variation. During the observation, three aerosol transport event was captured. The WIBS data show that some types of fluorescent aerosol particles exhibit abnormal increases in concentration and fraction to total particles or whole fluorescent aerosols during the transport events. We attribute these increases to the transported external fluorescent bioaerosols instead of local bioaerosols. Based on the Hybrid Single Particle Lagrangian Integrated Trajectory (HYSPLIT) backward trajectory model and the characteristics of external aerosols in WIBS, their possible sources, transport paths, and components are given. This work proves the influence of external aerosol transport on local high particulate matter (PM) pollution and fluorescent aerosol particle composition and gives a possible method for real-time monitoring of fluorescent biological aerosol transport events. It contributes to the further understanding of bioaerosol transport. [ABSTRACT FROM AUTHOR]