Lithogenic particle transport trajectories on the Northwest Atlantic Margin
Author Posting. © American Geophysical Union, 2021. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 126(1), (2021): e2020JC016802, https://doi.org/10.1029...
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Online Access: | https://hdl.handle.net/1912/27078 |
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/27078 2023-05-15T17:45:35+02:00 Lithogenic particle transport trajectories on the Northwest Atlantic Margin Hwang, Jeomshik Blusztajn, Jerzy S. Giosan, Liviu Kim, Minkyoung Manganini, Steven J. Montluçon, Daniel Toole, John M. Eglinton, Timothy I. 2020-12-04 https://hdl.handle.net/1912/27078 unknown American Geophysical Union https://doi.org/10.1029/2020JC016802 Hwang, J., Blusztajn, J., Giosan, L., Kim, M., Manganini, S. J., Montlucon, D., Toole, J. M., & Eglinton, T. I. (2021). Lithogenic particle transport trajectories on the Northwest Atlantic Margin. Journal of Geophysical Research: Oceans, 126(1), e2020JC016802. https://hdl.handle.net/1912/27078 doi:10.1029/2020JC016802 Hwang, J., Blusztajn, J., Giosan, L., Kim, M., Manganini, S. J., Montlucon, D., Toole, J. M., & Eglinton, T. I. (2021). Lithogenic particle transport trajectories on the Northwest Atlantic Margin. Journal of Geophysical Research: Oceans, 126(1), e2020JC016802. doi:10.1029/2020JC016802 Hemipelagic sedimentation Lateral particle transport Neodymium isotopes Nepheloid layers New England margin Sediment traps Article 2020 ftwhoas https://doi.org/10.1029/2020JC016802 2022-10-29T22:57:22Z Author Posting. © American Geophysical Union, 2021. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 126(1), (2021): e2020JC016802, https://doi.org/10.1029/2020JC016802. 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. This research was funded ... Article in Journal/Newspaper Northwest Atlantic Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Journal of Geophysical Research: Oceans 126 1 |
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Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
unknown |
topic |
Hemipelagic sedimentation Lateral particle transport Neodymium isotopes Nepheloid layers New England margin Sediment traps |
spellingShingle |
Hemipelagic sedimentation Lateral particle transport Neodymium isotopes Nepheloid layers New England margin Sediment traps Hwang, Jeomshik Blusztajn, Jerzy S. Giosan, Liviu Kim, Minkyoung Manganini, Steven J. Montluçon, Daniel Toole, John M. Eglinton, Timothy I. Lithogenic particle transport trajectories on the Northwest Atlantic Margin |
topic_facet |
Hemipelagic sedimentation Lateral particle transport Neodymium isotopes Nepheloid layers New England margin Sediment traps |
description |
Author Posting. © American Geophysical Union, 2021. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 126(1), (2021): e2020JC016802, https://doi.org/10.1029/2020JC016802. 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. This research was funded ... |
format |
Article in Journal/Newspaper |
author |
Hwang, Jeomshik Blusztajn, Jerzy S. Giosan, Liviu Kim, Minkyoung Manganini, Steven J. Montluçon, Daniel Toole, John M. Eglinton, Timothy I. |
author_facet |
Hwang, Jeomshik Blusztajn, Jerzy S. Giosan, Liviu Kim, Minkyoung Manganini, Steven J. Montluçon, Daniel Toole, John M. Eglinton, Timothy I. |
author_sort |
Hwang, Jeomshik |
title |
Lithogenic particle transport trajectories on the Northwest Atlantic Margin |
title_short |
Lithogenic particle transport trajectories on the Northwest Atlantic Margin |
title_full |
Lithogenic particle transport trajectories on the Northwest Atlantic Margin |
title_fullStr |
Lithogenic particle transport trajectories on the Northwest Atlantic Margin |
title_full_unstemmed |
Lithogenic particle transport trajectories on the Northwest Atlantic Margin |
title_sort |
lithogenic particle transport trajectories on the northwest atlantic margin |
publisher |
American Geophysical Union |
publishDate |
2020 |
url |
https://hdl.handle.net/1912/27078 |
genre |
Northwest Atlantic |
genre_facet |
Northwest Atlantic |
op_source |
Hwang, J., Blusztajn, J., Giosan, L., Kim, M., Manganini, S. J., Montlucon, D., Toole, J. M., & Eglinton, T. I. (2021). Lithogenic particle transport trajectories on the Northwest Atlantic Margin. Journal of Geophysical Research: Oceans, 126(1), e2020JC016802. doi:10.1029/2020JC016802 |
op_relation |
https://doi.org/10.1029/2020JC016802 Hwang, J., Blusztajn, J., Giosan, L., Kim, M., Manganini, S. J., Montlucon, D., Toole, J. M., & Eglinton, T. I. (2021). Lithogenic particle transport trajectories on the Northwest Atlantic Margin. Journal of Geophysical Research: Oceans, 126(1), e2020JC016802. https://hdl.handle.net/1912/27078 doi:10.1029/2020JC016802 |
op_doi |
https://doi.org/10.1029/2020JC016802 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
126 |
container_issue |
1 |
_version_ |
1766148715324637184 |