气候变化领域集成服务门户(CCPortal): Lithogenic Particle Transport Trajectories on the Northwest Atlantic Margin

CCPortal

DOI	10.1029/2020JC016802
	Lithogenic Particle Transport Trajectories on the Northwest Atlantic Margin
	Hwang J.; Blusztajn J.; Giosan L.; Kim M.; Manganini S.J.; Montluçon D.; Toole J.M.; Eglinton T.I.
发表日期	2021
ISSN	21699275
卷号	126 期号:1
英文摘要	The neodymium isotopic composition of the detrital (lithogenic) fraction (εNd-detrital) of surface sediments and sinking particles was examined to constrain transport trajectories associated with hemipelagic sedimentation on the northwest Atlantic margin. The provenance of resuspended sediments and modes of lateral transport in the water column were of particular interest given the energetic hydrodynamic regime that sustains bottom and intermediate nepheloid layers over the margin. A large across-margin gradient of ∼5 εNd units was observed for surface sediments, implying strong contrasts in sediment provenance, with εNd-detrital values on the lower slope similar to those of “upstream regions” (Scotian margin) under the influence of the Deep Western Boundary Current (DWBC). Sinking particles collected at three depths at a site (total water depth, ∼3,000 m) on the New England margin within the core of the DWBC exhibited a similarly large range in εNd-detrital values. The εNd-detrital values of particles intercepted at intermediate water depths (1,000 and 2,000 m) were similar to each other but significantly higher than those at 3,000 m (∼50 m above the seafloor). These observations suggest that lithogenic material accumulating in the upper two traps was primarily advected in intermediate nepheloid layers emanating from the adjacent shelf, while that at 3,000 m is strongly influenced by sediment resuspension and along-margin, southward lateral transport within the bottom nepheloid layer via entrainment in the DWBC. Our results highlight the importance of both along- and across-margin sediment transport as vectors for lithogenic material and associated organic carbon transport. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	hemipelagic sedimentation; lateral particle transport; neodymium isotopes; nepheloid layers; New England margin; sediment traps
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186526
作者单位	School of Earth and Environmental Sciences/Research Institute of Oceanography, Seoul National University, Seoul, South Korea; Geology and Geophysics Department, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Geological Institute, ETH Zürich, Zürich, Switzerland; Marine Chemistry and Geochemistry Department, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Physical Oceanography Department, Woods Hole Oceanographic Institution, Woods Hole, MA, United States
推荐引用方式 GB/T 7714	Hwang J.,Blusztajn J.,Giosan L.,et al. Lithogenic Particle Transport Trajectories on the Northwest Atlantic Margin[J],2021,126(1).
APA	Hwang J..,Blusztajn J..,Giosan L..,Kim M..,Manganini S.J..,...&Eglinton T.I..(2021).Lithogenic Particle Transport Trajectories on the Northwest Atlantic Margin.Journal of Geophysical Research: Oceans,126(1).
MLA	Hwang J.,et al."Lithogenic Particle Transport Trajectories on the Northwest Atlantic Margin".Journal of Geophysical Research: Oceans 126.1(2021).