Proxies of hypoxia and submarine groundwater discharge in the coastal ocean: Foraminiferal shell chemical perspectives

被引:1
|
作者
Guo, Xiaoyi [1 ,2 ,3 ,4 ]
Lian, Ergang [5 ,6 ]
Yuan, Huamao [7 ]
Burnett, William C. [8 ]
Zhang, Han [1 ,2 ,3 ,4 ]
Zhang, Miaomiao [1 ,2 ,3 ,4 ]
Xiao, Kai [9 ]
Wei, Qinsheng [10 ]
Yu, Zhigang [1 ,2 ,3 ]
Xu, Bochao [1 ,2 ,3 ]
机构
[1] Ocean Univ China, Frontiers Sci Ctr Deep Ocean Multispheres & Earth, Qingdao 266100, Peoples R China
[2] Ocean Univ China, Key Lab Marine Chem Theory & Technol, Minist Educ, Qingdao 266100, Peoples R China
[3] Qingdao Natl Lab Marine Sci & Technol, Lab Marine Ecol & Environm Sci, Qingdao 266237, Peoples R China
[4] Ocean Univ China, Coll Chem & Chem Engn, Qingdao 266100, Peoples R China
[5] Tongji Univ, State Key Lab Marine Geol, Shanghai 200092, Peoples R China
[6] Minist Ecol & Environm, Res Ctr Monitoring & Environm Sci, Taihu Basin & East China Sea Ecol Environm Supervi, Shanghai 200120, Peoples R China
[7] Chinese Acad Sci, Inst Oceanol, Key Lab Marine Ecol & Environm Sci, Qingdao 266071, Peoples R China
[8] Florida State Univ, Dept Earth Ocean & Atmospher Sci, Tallahassee, FL 32306 USA
[9] Southern Univ Sci & Technol, Sch Environm Sci & Engn, Shenzhen 518055, Peoples R China
[10] Minist Nat Resources, Inst Oceanog 1, Qingdao 266061, Peoples R China
基金
中国国家自然科学基金;
关键词
Benthic foraminifera; Mn/ca and Ba/ca ratios; Coastal hypoxia; Submarine groundwater discharge; BENTHIC FORAMINIFERA; MN/CA RATIOS; CHANGJIANG YANGTZE; ICP-MS; OXYGEN; RIVER; TEMPERATURE; CULTURE; RADIUM; BARIUM;
D O I
10.1016/j.marchem.2024.104434
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Coastal marine settings are important in terms of geochemical cycles and biological productivity. Climate change is predicted to affect coastal environment via hypoxia and Submarine Groundwater Discharge (SGD). Appropriate proxies could help to better understand oxygenation history and the role of SGD in regulating hypoxia. This would also benefit prediction of potential outcomes of future environmental changes. The sensitivity of benthic foraminiferal shell chemistry to environmental conditions opens the possibility to use them as proxies of coastal hypoxia and SGD. We report here that the average Mn/Ca ratios in tests of living benthic foraminiferal shells in the Changjiang River Estuary (CJE) is 2.3 times higher during hypoxia periods than under well-mixed conditions. In addition, Ba/Ca ratios in living benthic foraminiferal shells co-varied well with radon-inferred SGD signals. Fluctuations of Mn/Ca and Ba/Ca ratios in tests of a single foraminiferal shell along successive chambers corresponds well with seasonal-scale variations of hypoxia and SGD. We suggest that Mn/Ca and Ba/Ca ratios within intra-tests of benthic foraminifer can provide a reliable proxy for past hypoxia and SGD trends.
引用
收藏
页数:7
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