Submarine groundwater discharge and seasonal hypoxia off the Changjiang River Estuary

IF 1.4 3区地球科学 Q3 OCEANOGRAPHY

Acta Oceanologica Sinica Pub Date : 2023-10-31 DOI:10.1007/s13131-023-2256-9

Tianyi Zhu, Bochao Xu, Xiaoyi Guo, Qinsheng Wei, Ergang Lian, Pengxia Liu, William C. Burnett, Qingzhen Yao, Zhigang Yu

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Abstract

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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长江口海底地下水排泄与季节性缺氧

缺氧是全球主要河口之一长江口附近海域的常见现象。海底地下水排放（SGD）是公认的陆地物质进入海洋的途径，已被发现在CJE附近具有重要意义。我们使用222Rn质量平衡模型来估计CJE附近的SGD通量，并表明它与季节性溶解氧（DO）变化有关。冬季平均SGD通量为（0.012±0.010）m3/（m2·d），夏季为（0.034±0.015）m3/（m2.d），秋季为（0.020±0.010。我们发现DO浓度和SGD率之间存在显著的负相关，夏季汛期地下水流量最高。此外，SGD和夏季缺氧区的分布模式在空间上重叠，表明SGD是该地区夏季缺氧的重要原因。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Acta Oceanologica Sinica 地学-海洋学

CiteScore

2.50

自引率

7.10%

发文量

3884

审稿时长

9 months

期刊介绍： Founded in 1982, Acta Oceanologica Sinica is the official bi-monthly journal of the Chinese Society of Oceanography. It seeks to provide a forum for research papers in the field of oceanography from all over the world. In working to advance scholarly communication it has made the fast publication of high-quality research papers within this field its primary goal. The journal encourages submissions from all branches of oceanography, including marine physics, marine chemistry, marine geology, marine biology, marine hydrology, marine meteorology, ocean engineering, marine remote sensing and marine environment sciences. It publishes original research papers, review articles as well as research notes covering the whole spectrum of oceanography. Special issues emanating from related conferences and meetings are also considered. All papers are subject to peer review and are published online at SpringerLink.