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Biogeochemical behaviors of 210Po, 210Bi, and 210Pb in the East China Sea close to the Changjiang River Estuary during a spring red tide event
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Wenqing Zhou1, Qiangqiang Zhong2, 3, *, Yuehua Zhou4, Qiugui Wang5, Hao Wang2, Juan Du6, *
Haiyang Xuebao | 2025, 47(1) : 25 - 35
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Haiyang Xuebao | 2025, 47(1): 25-35
• Article •
Biogeochemical behaviors of 210Po, 210Bi, and 210Pb in the East China Sea close to the Changjiang River Estuary during a spring red tide event
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Wenqing Zhou1, Qiangqiang Zhong2, 3, *, Yuehua Zhou4, Qiugui Wang5, Hao Wang2, Juan Du6, *
Affiliations
  • 1. Key Laboratory of Ocean Observation Technology, National Ocean Technology Center, Ministry of Natural Resources, Tianjin 300112, 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. 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
Published: 2025-01-31 doi: 10.12284/hyxb2025020
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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 River Estuary during a red tide event on the spring scientific cruise organized by National Natural Science Foundation of China 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 excess of 210Po and 210Bi 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
Wenqing Zhou, Qiangqiang Zhong, Yuehua Zhou, Qiugui Wang, Hao Wang, Juan Du. Biogeochemical behaviors of 210Po, 210Bi, and 210Pb in the East China Sea close to the Changjiang River Estuary during a spring red tide event[J]. Haiyang Xuebao, 2025 , 47 (1) : 25 -35 . DOI: 10.12284/hyxb2025020
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Year 2025 volume 47 Issue 1
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Article Info
doi: 10.12284/hyxb2025020
  • Receive Date：2024-04-03
  • Online Date：2025-11-10
  • Published：2025-01-31
Article Data
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History
  • Received：2024-04-03
  • Revised：2024-10-29
Funding
Affiliations
    1. Key Laboratory of Ocean Observation Technology, National Ocean Technology Center, Ministry of Natural Resources, Tianjin 300112, 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. 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
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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