DOI: 10.1029/2018GB006115
论文题名: New Insights Into Processes Controlling the δ30Si of Sinking Diatoms: A Seasonally Resolved Box Model Approach
作者: Closset I. ; Cardinal D. ; Trull T.W. ; Fripiat F.
刊名: Global Biogeochemical Cycles
ISSN: 0886-6236
EISSN: 1944-9224
出版年: 2019
卷: 33, 期: 8 语种: 英语
英文关键词: biogeochemical cycle
; concentration (composition)
; diatom
; dissolution
; isotopic composition
; isotopic fractionation
; mixed layer
; seasonal variation
; sediment trap
; silicic acid
; silicon
; surface water
; temporal evolution
; Bacillariophyta
学科: diatoms
; export production
; model
; silicon cycle
; silicon isotopes
; Southern Ocean
中文摘要: In the Southern Ocean, the silicon (Si) biogeochemical cycle is dominated by processes such as the supply of Si into the surface waters, Si uptake into diatom frustules, and their subsequent dissolution and export. Due to the incomplete assimilation of the silicic acid pool (DSi) and isotopic fractionation during silicification, the Si isotopic composition (δ30Si) of biogenic silica (BSi) is closely linked to the degree of Si utilization in the mixed layer (ML). In this study, we combined modelling approaches and seasonal sediment trap records of δ30Si of exported BSi to investigate the magnitude, timing, and isotopic composition of the flux of siliceous particles transferred from the surface to the deep ocean. We implemented a box model to describe the temporal evolution of DSi and BSi concentrations and δ30Si in the ML and at depth. The model allows us to quantify fluxes of Si in and out of the ML associated with export, dissolution, and mixing. It highlights that the time-integrated δ30Si of exported BSi measured in the sediments reflects the extent of DSi consumption at the time when net BSi production and diatom accumulation are maximal in the ML and confirms that the δ30Si of diatoms is a reliable proxy for past Si utilization. ©2019. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160118
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: MSI, University of California Santa Barbara, Santa Barbara, CA, United States; LOCEAN UMR 7159 Sorbonne Université/CNRS/IRD/MNHN, Paris, France; Antarctic Climate and Ecosystems Cooperative Research Center, University of Tasmania, Hobart, TAS, Australia; CSIRO Oceans and Atmosphere, Hobart, TAS, Australia; Max Planck Institute for Chemistry, Mainz, Germany
Recommended Citation:
Closset I.,Cardinal D.,Trull T.W.,et al. New Insights Into Processes Controlling the δ30Si of Sinking Diatoms: A Seasonally Resolved Box Model Approach[J]. Global Biogeochemical Cycles,2019-01-01,33(8)