Assessment of 210Po, 210Bi and 210Pb in aerosols and their deposition fluxes in the nearshore region of the East China Sea

Ma Ruiyang; Zhong Qiangqiang; Wang Hao; Du Juan; Liu Wenjing; Zhang Jieran; Huang Dekun; Yu Tao

doi:10.12284/hyxb2024054

Volume 46 Issue 3

Mar. 2024

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Ma Ruiyang，Zhong Qiangqiang，Wang Hao, et al. Assessment of 210Po, 210Bi and 210Pb in aerosols and their deposition fluxes in the nearshore region of the East China Sea[J]. Haiyang Xuebao，2024, 46(3)：118–128 doi: 10.12284/hyxb2024054

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Ma Ruiyang，Zhong Qiangqiang，Wang Hao, et al. Assessment of ²¹⁰Po, ²¹⁰Bi and ²¹⁰Pb in aerosols and their deposition fluxes in the nearshore region of the East China Sea[J]. Haiyang Xuebao，2024, 46(3)：118–128 doi: 10.12284/hyxb2024054

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Assessment of ²¹⁰Po, ²¹⁰Bi and ²¹⁰Pb in aerosols and their deposition fluxes in the nearshore region of the East China Sea

doi: 10.12284/hyxb2024054

Ma Ruiyang^{1, 2
,},
Zhong Qiangqiang^{2, 3
,
,},
Wang Hao^{1, 2},
Du Juan⁴,
Liu Wenjing²,
Zhang Jieran²,
Huang Dekun²,
Yu Tao^{2
,
,}

1.
College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China
2.
Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
3.
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China
4.
Research Centre for Eco-Environmental Engineering, Dongguan University of Technology, Dongguan 523808, China

Received Date: 2023-07-20
Rev Recd Date: 2024-01-09

Available Online: 2024-03-11

Publish Date: 2024-03-31

Abstract

Abstract

The deposition fluxes of ²¹⁰Po, ²¹⁰Bi and ²¹⁰Pb in atmosphere are the basis for the application of radionuclide tracing in the ocean. In order to reveal the spatio-temporal variation of the activity of ²¹⁰Po, ²¹⁰Bi and ²¹⁰Pb in nearshore areas and estimate their deposition fluxes into the sea, in this paper, sampling observation and analysis of two typical areas near the East China Sea in Shanghai and Xiamen in different periods are carried out. A time series study was conducted on the the aerosol activities of ²¹⁰Po, ²¹⁰Pb and²¹⁰Bi in Shanghai and Xiamen from September 2016 to February 2017 and from September to November 2021, respectively. The residence time of aerosol particle was calculated based on ²¹⁰Po/²¹⁰Pb and ²¹⁰Bi/²¹⁰Pb. Deposition fluxes of three nuclides were also estimated. This paper reported the activity of ²¹⁰Po, ²¹⁰Bi and ²¹⁰Pb in Shanghai in autumn and winter of 2016. The activity ranges of ²¹⁰Po, ²¹⁰Pb and²¹⁰Bi were 0.11−1.27 mBq/m³, 0.45−1.83 mBq/m³ and 1.12−6.10 mBq/m³, respectively. In the fall of 2021, the activity ranges of ²¹⁰Po, ²¹⁰Bi and ²¹⁰Pb in Xiamen were 0.05−0.85 mBq/m³, 0.83−2.52 mBq/m³ and 0.17−1.32 mBq/m³, respectively. The aerosol activity of each nuclide in Shanghai was higher than that in Xiamen. The estimated residence time based on ²¹⁰Po-²¹⁰Pb and ²¹⁰Bi-²¹⁰Pb methods are significantly different, for example, in Shanghai area, the averaged aerosol residence time based on ²¹⁰Po-²¹⁰Pb method was calculated to be (94 ± 54) d, which is much higher than the result from ²¹⁰Bi-²¹⁰Pb method. The main reason for this difference is most likely due to the difference in the properties of the tracing isotopes we used. In this paper, based on a one-dimensional simple aerosol deposition rate model, the atmospheric deposition fluxes of ²¹⁰Pb, ²¹⁰Bi and²¹⁰Po over Shanghai area into the East China Sea are estimated, and their variation ranges are 0.1−26.35 Bq/(m²·d), 0.04−7.91 Bq/(m²·d) and 0.01−5.49 Bq/(m²·d), respectively. The deposition fluxes of ²¹⁰Po, ²¹⁰Bi and ²¹⁰Pb estimated based on the model are close to the actual observed values in the study area during the same period in winter within a certain range. The feasibility of estimating the deposition flux of nuclide into the sea with a simple one dimensional aerosol deposition rate model is verified.
- nearshore region of the East China Sea,
- ²¹⁰Po,
- ²¹⁰Bi,
- ²¹⁰Pb,
- residence time,
- deposition flux

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References(38)

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