Abstract

<strong class="journal-contentHeaderColor">Abstract.</strong> Bioaerosols are usually defined as aerosols arising 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 also regional climate. 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) is deployed for aerosol and wind detection in Hefei, China, from 11 to 20 March in 2020. A wideband integrated bioaerosol sensor (WIBS) is used to monitor variations in local fluorescent bioaerosols. Three aerosol transport events are captured. The WIBS data show that, during these transport events, several types of fluorescent aerosol particles exhibit abnormal increases in their concentration, number fractions to total particles, and number fractions to whole fluorescent aerosols. These increases are attributed to 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. The results prove 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 provides a potential method for real-time monitoring of fluorescent biological aerosol transport events. In addition, it also helps to understand the relationships between atmospheric phenomena at high altitudes like virga and the variation of surface bioaerosol. It contributes to the further understanding of long-range bioaerosol transport, the roles of bioaerosols in atmospheric processes, and in aerosol–cloud–precipitation interactions.

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

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Summary

Introduction

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

PM data and meteorological data
WIBS data measurements and processing
Lidar and in situ observation
Categorized WIBS data
Transport path and transported bioaerosol types
Findings
Conclusion

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