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Incorporation of Al into diatom frustule as a proxy of seawater Al/Si ratios in the Antarctic Zone of the Southern ocean: Implications for surface silicic acid concentrations during the last glacial period

文献类型：期刊论文

作者Yang, Xinyu1; Li, Tao2,3; Chen, Tianyu1; Zheng, Jianfan1; Li, Wei3
刊名QUATERNARY SCIENCE REVIEWS
出版日期2024-06-15
卷号334页码:11
ISSN号0277-3791
DOI10.1016/j.quascirev.2024.108724
通讯作者Li, Tao(taoli@nigpas.ac.cn) ; Chen, Tianyu(tianyuchen@nju.edu.cn)
英文摘要Knowledge of silicic acid concentrations at the surface Southern Ocean helps better understand the role of the biological pump in regulating atmospheric CO2 2 concentrations in the past. While the silicon isotope compositions of diatom provide a measure of Si utilization efficiency, proxies on surface silicic acid concentration are not yet available. Here we determined the diatom frustule Al/Si ratio and dust flux to constrain the surface silicic acid concentrations in the Atlantic sector of the Southern Ocean. Our results based on multiple methods, including inductively coupled plasma mass spectrometry (ICP-MS), scanning electron microscope (SEM) and energy- dispersive spectroscopy (EDS), and nuclear magnetic resonance spectroscopy (NMR), suggest the isomorphic substitution of Al for Si by frustule biosynthesis. This enables us to transfer the diatom Al/Si ratio into seawater Al/Si ratio using the partition coefficient of Al between diatom silica and seawater. By further constraining dust flux using the sediment 230 Th-normalized 232 Th flux, we found that the markedly higher frustule Al/Si ratios cannot be solely explained by increased Al dissolution from dust and call for much lower surface silicic acid concentrations in the Antarctic Zone during the Last Glacial Period. The lower silicic acid concentration coupled with lower Si utilization efficiency inferred previously from silicon isotopes in the Antarctic Zone is likely due to the combined effects of reduced upwelling and iron-fertilization-regulated uptake stoichiometry, contributing to a lower atmospheric CO2 2 during the Last Glacial Period.
WOS关键词DISSOLVED ALUMINUM ; BIOGENIC SILICA ; ATMOSPHERIC CO2 ; EARLY DIAGENESIS ; ATLANTIC-OCEAN ; AMAZON DELTA ; IRON ; DISSOLUTION ; ISOTOPES ; WATERS
资助项目National Key Research and Development Program of China[2023YFF0805003] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB40010200] ; National Natural Science Foundation of China[42372211] ; State Key Laboratory of Palaeobiology and Stratigraphy
WOS研究方向Physical Geography ; Geology
语种英语
WOS记录号WOS:001300693000001
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构National Key Research and Development Program of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; State Key Laboratory of Palaeobiology and Stratigraphy
源URL[http://ir.nigpas.ac.cn/handle/332004/44254]  
专题中国科学院南京地质古生物研究所
通讯作者Li, Tao; Chen, Tianyu
作者单位1.Nanjing Univ, Sch Earth Sci & Engn, State Key Lab Mineral Deposit Res, Nanjing 210023, Peoples R China
2.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China
3.Nanjing Univ, Sch Earth Sci & Engn, MOE Key Lab Surficial Geochem, Nanjing 210023, Peoples R China
推荐引用方式
GB/T 7714		 Yang, Xinyu,Li, Tao,Chen, Tianyu,et al. Incorporation of Al into diatom frustule as a proxy of seawater Al/Si ratios in the Antarctic Zone of the Southern ocean: Implications for surface silicic acid concentrations during the last glacial period[J]. QUATERNARY SCIENCE REVIEWS,2024,334:11.
APA Yang, Xinyu,Li, Tao,Chen, Tianyu,Zheng, Jianfan,&Li, Wei.(2024).Incorporation of Al into diatom frustule as a proxy of seawater Al/Si ratios in the Antarctic Zone of the Southern ocean: Implications for surface silicic acid concentrations during the last glacial period.QUATERNARY SCIENCE REVIEWS,334,11.
MLA Yang, Xinyu,et al."Incorporation of Al into diatom frustule as a proxy of seawater Al/Si ratios in the Antarctic Zone of the Southern ocean: Implications for surface silicic acid concentrations during the last glacial period".QUATERNARY SCIENCE REVIEWS 334(2024):11.

入库方式： OAI收割

来源：南京地质古生物研究所

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