DOI: 10.1002/2015GB005189
Scopus记录号: 2-s2.0-84957824016
论文题名: Simulating the modern δ30Si distribution in the oceans and in marine sediments
作者: Gao S ; , Wolf-Gladrow D ; A ; , Völker C
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2016
卷: 30, 期: 2 起始页码: 120
结束页码: 133
语种: 英语
英文关键词: biogenic silica
; biological fractionation
; marine silicon cycle
; ocean biogeochemical model
; silicon isotopes
Scopus关键词: biogenic material
; biogeochemical cycle
; climate modeling
; concentration (composition)
; diatom
; dissolution
; euphotic zone
; isotopic fractionation
; marine sediment
; microbial activity
; mixed layer
; mixing
; seasonality
; sediment chemistry
; silica
; simulation
; Atlantic Ocean
; Atlantic Ocean (South)
; Pacific Ocean
; Pacific Ocean (South)
; Bacillariophyta
英文摘要: The δ30Si of biogenic silica (δ30SiBSi) in marine sediments is a promising proxy for the reconstruction of silicic acid utilization by diatoms in the geological past. The application of this proxy, however, requires an understanding of the modern δ30Si distributions and their controlling mechanisms. Here we present results from a modern climate simulation with a coupled ocean-sediment model that includes a prognostic formulation of biogenic silica production with concurrent silicon isotopic fractionation. In agreement with previous studies, biological fractionation combined with physical transport and mixing determines the oceanic distribution of simulated δ30Si. A new finding is a distinct seasonal cycle of δ30Si in the surface ocean, which is inversely related to that of silicic acid concentration and mixed layer depth. We also provide the first simulation results of sedimentary δ30Si, which reveal that (1) the δ30SiBSi distribution in the surface sediment reflects the exported δ30SiBSi signal from the euphotic zone and (2) the dissolution of biogenic silica in the sediment acts as a source of relatively light δ30Si into the bottom waters of the polar oceans, while it is a source of heavier δ30Si to the subtropical South Atlantic and South Pacific. ©2016. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77883
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Biogeosciences, Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany; Geophysical Institute, University of Bergen, Bergen, Norway
Recommended Citation:
Gao S,, Wolf-Gladrow D,A,et al. Simulating the modern δ30Si distribution in the oceans and in marine sediments[J]. Global Biogeochemical Cycles,2016-01-01,30(2)