Abstract
Bioaerosols are usually defined as aerosols derived from biological systems such as bacteria, fungi, and viruses. They play an important role in atmospheric physical and chemical processes including ice nucleation and cloud condensation. As such, their dispersion affects not only public health but regional climate as well. Lidar is an effective technique for aerosol detection and pollution monitoring. It is also used to profile 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 to 20 March in 2020. A wideband integrated bioaerosol sensor (WIBS) was deployed to monitor variations in local fluorescent bioaerosol levels. During observation, three aerosol transport events were captured. The WIBS data show that during these transport events, several types of fluorescent aerosol particles exhibit abnormal increases in either their concentration, number fractions to total particles, or number fractions to whole fluorescent aerosols. These increases are attributed to 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 discussed. This work proves the influence of external aerosol transport on local high particulate matter (PM) pollution and fluorescent aerosol particle composition. The combination of WIBS and CDWL expands the aerosol monitoring parameters and proves to be a potential method for the real-time monitoring of fluorescent biological aerosol transport events. It contributes to the further understanding of bioaerosol transport.
Highlights
Aerosols are suspensions of fine solid particles or liquid droplets in the atmosphere
After 6:00 on 17 March, turbulence intensity began to increase as sunrise occurred, which inhibit local aerosol accumulation increased particles are dominated by transported external aerosols in which there were a higher fraction of particles in the coarse mode
The results of a coherent Doppler wind lidar and a bioaerosol sensor wideband integrated bioaerosol sensor (WIBS), local meteorological parameters, local particulate matter (PM) concentrations, and the Hybrid Single Particle Lagrangian Integrated Trajectory (HYSPLIT) backward trajectory model are used during the investigation
Summary
Aerosols are suspensions of fine solid particles or liquid droplets in the atmosphere. DAPI staining and DNA sequencing results show an increased level of airborne bacteria 60 concentrations and diversity in Northern China during Asian dust events (Tang et al, 2017) These studies are based on aerosol sampling technologies and offline analyses such as microscopy analysis and DNA sequencing. These offline analysis methods limit the temporal resolution during monitoring and the detection time for the external aerosol transport event. These sampling and offline analysis methods provide a typical time resolution ranging from a few hours to a few days, which may 65 not provide the ability to distinguish the bioaerosol process over a short time scale from the slower bioaerosol long-term variation trend. The lower threshold of CNR is set to -35 dB for low uncertainty in β′ retrieval
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