Biogeochemical behaviors of 210Po, 210Bi, and 210Pb in the East China Sea close to the Changjiang Estuary during a spring red tide event

Zhou Wenqing; Zhong Qiangqiang; Zhou Yuehua; Wang Qiugui; Wang Hao; Du Juan

doi:10.12284/hyxb2024-00

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Zhou Wenqing，Zhong Qiangqiang，Zhou Yuehua, et al. Biogeochemical behaviors of 210Po, 210Bi, and 210Pb in the East China Sea close to the Changjiang Estuary during a spring red tide event[J]. Haiyang Xuebao，2025, 47(x)：1–11 doi: 10.12284/hyxb2024-00

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Zhou Wenqing，Zhong Qiangqiang，Zhou Yuehua, et al. Biogeochemical behaviors of ²¹⁰Po, ²¹⁰Bi, and ²¹⁰Pb in the East China Sea close to the Changjiang Estuary during a spring red tide event[J]. Haiyang Xuebao，2025, 47(x)：1–11 doi: 10.12284/hyxb2024-00

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Biogeochemical behaviors of ²¹⁰Po, ²¹⁰Bi, and ²¹⁰Pb in the East China Sea close to the Changjiang Estuary during a spring red tide event

doi: 10.12284/hyxb2024-00

Zhou Wenqing^1
,,
Zhong Qiangqiang^{2, 3
,
,},
Zhou Yuehua⁴,
Wang Qiugui⁵,
Wang Hao²,
Du Juan^{6
,
,}

1.
National Ocean Technology Center, Key Laboratory of Ocean Observation Technology, Ministry of Natural Resources, Tianjin 300112, China
2.
Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
3.
East China Normal University, Shanghai 200062, China
4.
Xiamen Special Education School, Xiamen 361008, China
5.
School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China
6.
Research Centre for Eco-Environmental Engineering, Dongguan University of Technology, Dongguan 523808, China

Received Date: 2024-04-03
Rev Recd Date: 2024-10-29

Available Online: 2025-02-20

Abstract

Abstract

The ²¹⁰Bi-²¹⁰Pb radionuclide pair is considered to be a new radiotracer for particulate carbon dynamics. Due to the very short half-life of ²¹⁰Bi and the difficulty of determination, we have very few knowledge about the biogeochemical behavior of ²¹⁰Bi in the ocean and whether there is a ²¹⁰Bi-²¹⁰Pb activity disequilibrium. This paper reported the observation results of dissolved and particulate ²¹⁰Po, ²¹⁰Bi, and ²¹⁰Pb and their activity ratios in seawaters in the East China Sea close to the Changjiang Estuary during a red tide event on the spring scientific cruise from May 5 to 15, 2017. The results showed that the ²¹⁰Po/²¹⁰Pb activity ratio varied from 0.20 to 2.08, with an average of 0.82±0.58 (n=15) and the ²¹⁰Bi/²¹⁰Pb activity ratio changed between 0.31 and 3.72, showing an average of 1.38±0.79 (n=15). This phenomenon indicates that the activity disequilibrium of ²¹⁰Po-²¹⁰Pb and ²¹⁰Bi-²¹⁰Pb was ubiquitous in the seawater. More specifically, there is an obvious ²¹⁰Po and ²¹⁰Bi excess relative to ²¹⁰Pb in deep seawater, which implied that ²¹⁰Po and ²¹⁰Bi might be released from sinking particles in the middle and deep layer of water column. By calculating the distribution coefficients and fractionation factors of ²¹⁰Po, ²¹⁰Bi, and ²¹⁰Pb, it was found that suspended particles in seawater tended to preferentially scavenge and remove ²¹⁰Po and ²¹⁰Bi, comparing with ²¹⁰Pb. Similar to ²¹⁰Po, ²¹⁰Bi showed a stronger particle affinity for marine suspended particles than ²¹⁰Pb, and the increase of phytoplankton biomass can promote the fractionation behavior between ²¹⁰Bi and ²¹⁰Pb, supporting the idea that ²¹⁰Bi-²¹⁰Pb can be used to trace particle processes in the ocean.
- Coastal sea,
- ²¹⁰Bi-²¹⁰Pb disequilibrium,
- Red tide,
- Fractionation factor,
- Biogeochemical behavior

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References(23)

References

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