气候变化领域集成服务门户(CCPortal): Sediment efflux of silicon on the Greenland margin and implications for the marine silicon cycle

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DOI	10.1016/j.epsl.2019.115877
	Sediment efflux of silicon on the Greenland margin and implications for the marine silicon cycle
	Ng H.C.; Cassarino L.; Pickering R.A.; Woodward E.M.S.; Hammond S.J.; Hendry K.R.
发表日期	2020
ISSN	0012821X
卷号	529
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.
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
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202804
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
推荐引用方式 GB/T 7714	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],2020,529.
APA	Ng H.C.,Cassarino L.,Pickering R.A.,Woodward E.M.S.,Hammond S.J.,&Hendry K.R..(2020).Sediment efflux of silicon on the Greenland margin and implications for the marine silicon cycle.Earth and Planetary Science Letters,529.
MLA	Ng H.C.,et al."Sediment efflux of silicon on the Greenland margin and implications for the marine silicon cycle".Earth and Planetary Science Letters 529(2020).