DOI: 10.1016/j.epsl.2019.115877
论文题名: Sediment efflux of silicon on the Greenland margin and implications for the marine silicon cycle
作者: Ng H.C. ; Cassarino L. ; Pickering R.A. ; Woodward E.M.S. ; Hammond S.J. ; Hendry K.R.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 529 语种: 英语
中文关键词: benthic nutrient flux
; early diagenesis
; ocean silicon cycle
; polar ocean
; silicon isotopes
英文关键词: Isotopes
; Nutrients
; Sedimentology
; Silica
; Silicon
; Water
; Water recycling
; Benthic nutrient fluxes
; Early diagenesis
; Polar Oceans
; Silicon cycle
; Silicon isotopes
; Sediments
; benthos
; diagenesis
; environmental change
; isotopic analysis
; nutrient dynamics
; plankton
; porewater
; sediment core
; silicon
; Arctic
; Atlantic Ocean
; Greenland
; Labrador Sea
; Bacillariophyta
英文摘要: The polar region is experiencing one of the most rapid environmental changes driven by atmospheric warming, and feedbacks within the cryosphere. Under such a setting, it is crucial to understand the biogeochemical cycling of the nutrient silicon (Si) in the high latitudes, which is regulating the nutrient supply to polar ecosystems, and is linked to the global carbon cycle via diatom production. However, these efforts have been hindered by a lack of understanding of the benthic Si cycle, particularly the quantification of the sediment efflux of Si, and identification of the responsible mechanistic processes during early diagenesis. Here, we address these issues using new pore water profiles and incubation experiments on sediment cores collected from the Greenland margin and Labrador Sea, combined with Si isotope analysis and a mass balance model. Benthic Si flux at our study sites is found to be greatly heightened from values sustained by pore water molecular diffusion. The remainder of the flux is likely accountable with early dissolution of reactive biogenic silica phases at the upper sediments, and advective transport of pore waters. Our results highlight an active benthic Si cycle at a northern high-latitude continental margin, which could play a key role in recycling significant amounts of biologically available dissolved Si to the overlying water, and influencing the growth of benthic and planktonic communities in the polar region. © 2019 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165182
Appears in Collections: 气候变化与战略
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作者单位: School of Earth Sciences, University of Bristol, Bristol, BS8 1RJ, United Kingdom; Dauphin Island Sea Laboratory, 101 Bienville Boulevard, Dauphin Island, AL 36528, United States; University of South Alabama, Mobile, AL 36688, United States; Plymouth Marine Laboratory, Prospect Place, The Hoe, Plymouth, PL1 3DH, United Kingdom; School of Environment, Earth, and Ecosystem Sciences, The Open University, Milton Keynes, MK7 6AA, United Kingdom
Recommended Citation:
Ng H.C.,Cassarino L.,Pickering R.A.,et al. Sediment efflux of silicon on the Greenland margin and implications for the marine silicon cycle[J]. Earth and Planetary Science Letters,2020-01-01,529