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

doi:10.1016/j.quascirev.2024.108724

NIGPAS OpenIR

	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
通讯作者	Li, Tao([email protected]) ; Chen, Tianyu([email protected])
	Yang, Xinyu 1; Li, Tao 2,3; Chen, Tianyu 1; Zheng, Jianfan 1; Li, Wei 3
	2024-06-15
发表期刊	QUATERNARY SCIENCE REVIEWS
ISSN	0277-3791
卷号	334 页码:11
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.
DOI	10.1016/j.quascirev.2024.108724
收录类别	SCI
语种	英语
关键词[WOS]	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
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:001300693000001
项目资助者	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
出版者	PERGAMON-ELSEVIER SCIENCE LTD
文献类型	期刊论文
条目标识符	http://ir.nigpas.ac.cn/handle/332004/44255
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
通讯作者单位	中国科学院南京地质古生物研究所
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.