Volume 42 Issue 8
Aug.  2023
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Hao Wang, Qiangqiang Zhong, Fule Zhang, Suiyuan Chen, Hongyan Bao, Jing Lin, Dekun Huang, Tao Yu. Tracing surface seawater mixing and nutrient transport by 222Rn on the northern coast of Beibu Gulf, China[J]. Acta Oceanologica Sinica, 2023, 42(8): 87-98. doi: 10.1007/s13131-023-2233-3
Citation: Hao Wang, Qiangqiang Zhong, Fule Zhang, Suiyuan Chen, Hongyan Bao, Jing Lin, Dekun Huang, Tao Yu. Tracing surface seawater mixing and nutrient transport by 222Rn on the northern coast of Beibu Gulf, China[J]. Acta Oceanologica Sinica, 2023, 42(8): 87-98. doi: 10.1007/s13131-023-2233-3

Tracing surface seawater mixing and nutrient transport by 222Rn on the northern coast of Beibu Gulf, China

doi: 10.1007/s13131-023-2233-3
Funds:  The Scientific Research Foundation of the Third Institute of Oceanography, Ministry of Natural Resources under contract Nos 2023007 and 2020017; the Natural Science Foundation of Fujian Province under contract No. 2020J05010; the Foundation of Xiamen Institute of Marine Development under contract No. KFY202204; the Asian Cooperation Fund Project-Study on Typical Bay Ecological Protection and Management Demonstration.
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  • The transport and diffusion of substances in seawater are limited by the mixing motion of water bodies, while the main forms of mixing in offshore water bodies are advection and eddy diffusion. The eddy diffusion process of water indicates the possible transport direction of dissolved substances. However, the complex environment in the coastal zone makes it difficult to quantitatively assess the water diffusion process. 222Rn is a useful tool to trace the diffusion process of water bodies. However, studies on the 222Rn distribution and its behavior in the Beibu Gulf are scarce. In this study, the activity distribution characteristics of 222Rn in surface seawater of the Guangxi shelf area of the Beibu Gulf were measured. Based on the one-dimensional, steady-state model, the vorticity diffusion coefficient of 222Rn in the horizontal direction was calculated as (0.42−2.13) × 108 m2/d, and the offshore fluxes of 222Rn under the influence of water mixing were calculated as 2.00 × 1012 Bq/d. Correspondingly, the horizontal transport fluxes of silicate, phosphate, nitrite and nitrate were 6.28 × 10−3 mol/(m2·d), 0.10 × 10−3 mol/(m2·d), 0.20 × 10−3 mol/(m2·d) and 4.15 × 10−3 mol/(m2·d), respectively. These results indicate that the study of eddy current diffusion in offshore marine water facilitates a deeper understanding of the water mixing process and nutrient transport and migration.
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