globalchange  > 气候变化与战略
DOI: 10.1016/j.gca.2020.01.028
论文题名:
Dissolved silicon isotope dynamics in large river estuaries
作者: Zhang Z.; Cao Z.; Grasse P.; Dai M.; Gao L.; Kuhnert H.; Gledhill M.; Chiessi C.M.; Doering K.; Frank M.
刊名: Geochimica et Cosmochimica Acta
ISSN: 167037
出版年: 2020
卷: 273
语种: 英语
英文关键词: Biological fractionation ; Conservative mixing ; Large river estuaries ; Riverine Si input ; Stable Si isotopes
Scopus关键词: diatom ; estuary ; isotopic composition ; isotopic fractionation ; mixing ; silicon ; stable isotope ; water mass ; Amazon River ; China ; Pearl River [United States] ; United States ; Yangtze River ; Bacillariophyta
英文摘要: Estuarine systems are of key importance for the riverine input of silicon (Si) to the ocean, which is a limiting factor of diatom productivity in coastal areas. This study presents a field dataset of surface dissolved Si isotopic compositions (δ30SiSi(OH)4) obtained in the estuaries of three of the world's largest rivers, the Amazon (ARE), Yangtze (YRE), and Pearl (PRE), which cover different climate zones. While δ30SiSi(OH)4 behaved conservatively in the YRE and PRE supporting a dominant control by water mass mixing, significantly increased δ30SiSi(OH)4 signatures due to diatom utilization of Si(OH)4 were observed in the ARE and reflected a Si isotopic enrichment factor 30ε of −1.0 ± 0.4‰ (Rayleigh model) or −1.6 ± 0.4‰ (steady state model). In addition, seasonal variability of Si isotope behavior in the YRE was observed by comparison to previous work and most likely resulted from changes in water residence time, temperature, and light level. Based on the 30ε value obtained for the ARE, we estimate that the global average δ30SiSi(OH)4 entering the ocean is 0.2–0.3‰ higher than that of the rivers due to Si retention in estuaries. This systematic modification of riverine Si isotopic compositions during estuarine mixing, as well as the seasonality of Si isotope dynamics in single estuaries, needs to be taken into account for better constraining the role of large river estuaries in the oceanic Si cycle. © 2020 Elsevier Ltd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158714
Appears in Collections:气候变化与战略

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作者单位: State Key Laboratory of Marine Environmental Science and College of Ocean and Earth Sciences, Xiamen University, Xiamen, 361102, China; GEOMAR Helmholtz Center for Ocean Research Kiel, Kiel, 24148, Germany; State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, 200062, China; MARUM Center for Marine Environmental Sciences, University of Bremen, Bremen, 28359, Germany; School of Arts, Sciences and Humanities, University of São Paulo, São Paulo, 03828-000, Brazil; Department of Oceanography, Dalhousie University, Halifax, NS B3H 4R2, Canada

Recommended Citation:
Zhang Z.,Cao Z.,Grasse P.,et al. Dissolved silicon isotope dynamics in large river estuaries[J]. Geochimica et Cosmochimica Acta,2020-01-01,273
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