Volume 42 Issue 8
Aug.  2023
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Tianyi Zhu, Bochao Xu, Xiaoyi Guo, Qinsheng Wei, Ergang Lian, Pengxia Liu, William C. Burnett, Qingzhen Yao, Zhigang Yu. Submarine groundwater discharge and seasonal hypoxia off the Changjiang River Estuary[J]. Acta Oceanologica Sinica, 2023, 42(8): 125-133. doi: 10.1007/s13131-023-2256-9
Citation: Tianyi Zhu, Bochao Xu, Xiaoyi Guo, Qinsheng Wei, Ergang Lian, Pengxia Liu, William C. Burnett, Qingzhen Yao, Zhigang Yu. Submarine groundwater discharge and seasonal hypoxia off the Changjiang River Estuary[J]. Acta Oceanologica Sinica, 2023, 42(8): 125-133. doi: 10.1007/s13131-023-2256-9

Submarine groundwater discharge and seasonal hypoxia off the Changjiang River Estuary

doi: 10.1007/s13131-023-2256-9
Funds:  The National Natural Science Foundation of China under contract Nos 42130410 and U22A20580; the Fundamental Research Funds for the Central Universities under contract No. 202341002.
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  • Corresponding author: E-mail: xubc@ouc.edu.cn
  • Received Date: 2023-07-07
  • Accepted Date: 2023-09-11
  • Available Online: 2023-09-22
  • Publish Date: 2023-08-31
  • Hypoxia is a common phenomenon in the sea adjacent to the Changjiang River Estuary (CJE), one of the global major estuaries. Submarine groundwater discharge (SGD) is a widely recognized pathway for terrestrial materials entering the sea, and has been found to be significant off the CJE. We used a 222Rn mass balance model to estimate the SGD fluxes off the CJE and showed that it is linked to seasonal dissolved oxygen (DO) variations. Average SGD fluxes were estimated to be (0.012 ± 0.010) m3/(m2·d) in winter, (0.034 ± 0.015) m3/(m2·d) in summer, and (0.020 ± 0.010) m3/(m2·d) in autumn. We found a significant negative correlation between DO concentrations and SGD rates with groundwater discharge being highest in the summer flood season. In addition, distribution patterns of SGD and hypoxia zones in summer are spatially overlapped, indicating that SGD is an important contributor to summer hypoxia in this region.
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