Special Issue on 2019 Asian Aerosol Conference (AAC)

Guoqing Liu This email address is being protected from spambots. You need JavaScript enabled to view it.1, Jiabao Wu1, Yong Li1, Lingling Su2, Minxia Ding3

Department of Nuclear Science and Technology, College of Physics and Opotoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
Center for Advanced Materials Diagnostic Technology, Shenzhen Technology University, Shenzhen 518118, China
Shenzhen Environmental Monitoring Center, Shenzhen 518049, China


 

Received: November 5, 2019
Revised: February 24, 2020
Accepted: February 27, 2020

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.


Download Citation: ||https://doi.org/10.4209/aaqr.2019.11.0560 


Cite this article:

Liu, G., Wu, J., Li, Y., Su, L. and Ding, M. (2020). Temporal Variations of 7Be and 210Pb Activity Concentrations in the Atmosphere and Aerosol Deposition Velocity in Shenzhen, South China. Aerosol Air Qual. Res. 20: 1607–1617. https://doi.org/10.4209/aaqr.2019.11.0560


HIGHLIGHTS

  • 7Be and 210Pb in aerosols and deposition fluxes were measured for a whole year.
  • Temporal trends of 7Be and 210Pb in aerosols and deposition fluxes were studied.
  • Factors controlling 7Be and 210Pb in aerosols and deposition fluxes were evaluated.
  • The deposition velocity of aerosols were calculated using 7Be and 210Pb.
 

ABSTRACT


Naturally occurring beryllium-7 (7Be) and lead-210 (210Pb) serve as powerful tracers in atmospheric studies. In this study, 7Be and 210Pb were simultaneously measured in atmospheric aerosols and deposition samples for an entire year (from January to December 2017) in Shenzhen, South China. The activity concentrations of the airborne 7Be and 210Pb ranged from 0.33 to 9.42 mBq m–3 (averaging 3.23 mBq m–3) and from 0.59 to 4.72 mBq m–3 (averaging 1.58 mBq m–3), respectively, and were observed to be high during the winter but low during the summer. Moreover, the relatively high 210Pb concentration was probably due to the elevated level of radon in this region’s soil. The deposition fluxes of the 7Be and 210Pb were found to range from 0.25 to 3.04 Bq m–2 day–1 (averaging 1.57 Bq m–2 day–1) and from 0.34 to 1.31 Bq m–2 day–1 (averaging 0.73 Bq m–2 day–1), respectively. The temporal trends of these fluxes were largely influenced by rainfall and the origin and pathway of air masses, as well as by atmospheric circulation. Based on their concentrations in the aerosols and their deposition fluxes, the average deposition velocities of 7Be and 210Pb were calculated to be 0.83 and 0.62 cm s–1, respectively. The deposition velocities of both radionuclides correlated well with the amount of rainfall, indicating that precipitation plays a crucial role in removing 7Be and 210Pb from the air. The activity size distributions of these nuclides combined with the characteristic meteorological conditions in this region resulted in high deposition velocities during summer and low ones during winter.


Keywords: 7Be and 210Pb; Activity concentrations; Deposition fluxes; Deposition velocity of aerosols; Shenzhen.



Aerosol Air Qual. Res. 20:1607-1617. https://doi.org/10.4209/aaqr.2019.11.0560 

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