Ba/Ca in foraminifera shells as a proxy of submarine groundwater discharge

Ba/Ca in foraminifera shells as a proxy of submarine groundwater discharge
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有孔虫贝壳中的 Ba/Ca 作为海底地下水排放的代表

DOI:
10.1002/lol2.10290
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发表时间:
2022-11
影响因子:
7.8
通讯作者:
Bochao Xu
Bochao Xu
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Xiaoyi Guo;Huamao Yuan;William C. Burnett;Han Zhang;Ergang Lian;Haowei Xu;Zhigang Yu;Bochao Xu

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海底地下水排放(SGD)会对海洋环境和沿海水域的元素生物地球化学循环产生深远的影响。我们探索了使用底栖有孔虫壳的 Ba/Ca 比率作为 SGD 代理的可行性。溶解钡(DBa)在底层水中表现出富集行为,表明SGD是长江口的主要DBa来源。生活在 222Rn 活性较高(高 SGD)的底层水中的有孔虫比生活在底层水 222Rn 活性较低(低 SGD)的有孔虫显示出更大的 Ba/Ca 比值范围。我们的研究结果支持这样的观点,即底栖有孔虫 Ba/Ca 比率可以被视为 SGD 的定性代理。我们建议,在 SGD 是 DBa 主要来源的地区,有孔虫 Ba/Ca 比率可用于长期历史 SGD 记录。
Submarine groundwater discharge (SGD) can have a profound influence on marine environments and elemental biogeochemical cycles in coastal waters. We have explored the feasibility of using Ba/Ca ratios of benthic foraminiferal shells as a proxy of SGD. Dissolved barium (DBa) displayed enrichment behavior in bottom waters indicating that SGD is a major DBa source in the Changjiang (Yangtze) Estuary. Foraminifera that lived in bottom waters with elevated 222Rn activities (high SGD) showed a larger range of Ba/Ca ratios than those that lived under low bottom water 222Rn activities (low SGD). Our findings support the view that benthic foraminiferal Ba/Ca ratios could be treated as a qualitative proxy of SGD. We propose that in areas where SGD is the main source of DBa, foraminiferal Ba/Ca ratios could be applied for long‐term historical SGD records.
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