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首页> 外文期刊>Aerosol and Air Quality Research >Temporal Variations of 7Be and 210Pb Activity Concentrations in the Atmosphere and Aerosol Deposition Velocity in Shenzhen, South China
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Temporal Variations of 7Be and 210Pb Activity Concentrations in the Atmosphere and Aerosol Deposition Velocity in Shenzhen, South China

机译：南方深圳大气气氛和气溶胶沉积速度的7Be和210pb活性浓度的时间变化

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摘要

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.
机译：天然存在的铍-7（7be）和Lead-210（210pb）在大气研究中用作强大的示踪剂。在这项研究中，7BE和α210pb在大气气溶胶和整整一年（从2017年1月到12月）的沉积样本中同时测量，在华南，南方。空气传播的活性浓度为7be和？210pb的范围为0.33至9.42 mbq m-3？（平均3.23 mbq m-3），分别为0.59至4.72 mbq m-3？（平均1.58 mbq m-3），并且被观察到在冬季，但在夏天较低。此外，相对较高的？210pb浓度可能是由于该地区土壤中氡水平升高。 α7be和α210pb的沉积助熔剂，范围为0.25至3.04 bq m-2？（平均1.57 bq m-2？day-1），从0.34到1.31 bq m-2？日-1？（平均0.73 bq m-2？day-1）。这些助焊剂的时间趋势主要受降雨量的影响和空气质量的起源和途径，以及大气循环。基于它们在气溶胶中的浓度及其沉积通量，分别计算为0.83和0.62cm S-1的平均沉积速度。两种放射性核素的沉积速度随着降雨量的含量很好地相关，表明降水在从空气中取出7be和Δ210pb时起着至关重要的作用。这些核素的活性尺寸分布与该区域的特征气象条件结合在冬季期间夏季和低温期间的沉积速度高。

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