Preprints
https://doi.org/10.5194/amt-2021-401
https://doi.org/10.5194/amt-2021-401

  07 Dec 2021

07 Dec 2021

Review status: this preprint is currently under review for the journal AMT.

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

Dawei Tang1, Tianwen Wei1, Jinlong Yuan1, Haiyun Xia1,2,3, and Xiankang Dou1,4 Dawei Tang et al.
  • 1CAS Key Laboratory of Geospace Environment, School of Earth and Space Science, USTC, Hefei 230026, China
  • 2Hefei National Laboratory for Physical Sciences at the Microscale, Hefei 230026, China
  • 3CAS Center for Excellence in Comparative Planetology, Hefei 230026, China
  • 4School of Electronic Information, Wuhan University, Wuhan 430072, China

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.

Dawei Tang et al.

Status: open (until 08 Feb 2022)

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Dawei Tang et al.

Dawei Tang et al.

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Short summary
During 11–20 March 2020, three aerosol transport event was investigated by a lidar system and an online bioaerosol detection system in Hefei, China. Observation results reveal that the aerosol transport events not only cause high particulate matter pollution but the transport of external bioaerosols, resulting in changes in the fraction of fluorescent biological aerosol particles. This detection method improved the time resolution and provide more parameters for aerosol detection.