Benthic storms, nepheloid layers, and linkage with upper ocean dynamics in the western North Atlantic
Benthic storms are episodic periods of strong abyssal currents and intense, benthic nepheloid (turbid) layer development. In order to interpret the driving forces that create and sustain these storms, we synthesize measurements of deep ocean currents, nephelometer-based particulate matter (PM) conce...
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Online Access: | http://www.osti.gov/servlets/purl/1534072 https://www.osti.gov/biblio/1534072 https://doi.org/10.1016/j.margeo.2016.12.012 |
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ftosti:oai:osti.gov:1534072 2024-02-11T10:06:18+01:00 Benthic storms, nepheloid layers, and linkage with upper ocean dynamics in the western North Atlantic Gardner, Wilford D. Tucholke, Brian E. Richardson, Mary Jo Biscaye, Pierre E. 2024-01-19 application/pdf http://www.osti.gov/servlets/purl/1534072 https://www.osti.gov/biblio/1534072 https://doi.org/10.1016/j.margeo.2016.12.012 unknown http://www.osti.gov/servlets/purl/1534072 https://www.osti.gov/biblio/1534072 https://doi.org/10.1016/j.margeo.2016.12.012 doi:10.1016/j.margeo.2016.12.012 58 GEOSCIENCES 2024 ftosti https://doi.org/10.1016/j.margeo.2016.12.012 2024-01-20T23:50:57Z Benthic storms are episodic periods of strong abyssal currents and intense, benthic nepheloid (turbid) layer development. In order to interpret the driving forces that create and sustain these storms, we synthesize measurements of deep ocean currents, nephelometer-based particulate matter (PM) concentrations, and seafloor time-series photographs collected during several science programs that spanned two decades in the western North Atlantic. Benthic storms occurred in areas with high sea-surface eddy kinetic energy, and they most frequently occurred beneath the meandering Gulf Stream or its associated rings, which generate deep cyclones, anticyclones, and/or topographic waves; these create currents with sufficient bed-shear stress to erode and resuspend sediment, thus initiating or enhancing benthic storms. Occasionally, strong currents do not correspond with large increases in PM concentrations, suggesting that easily erodible sediment was previously swept away. Periods of moderate to low currents associated with high PM concentrations are also observed; these are interpreted as advection of PM delivered as storm tails from distal storm events. Outside of areas with high surface and deep eddy kinetic energy, benthic nepheloid layers are weak to non-existent, indicating that benthic storms are necessary to create and maintain strong nepheloid layers. Origins and intensities of benthic storms are best identified using a combination of time-series measurements of bottom currents, PM concentration, and bottom photographs, and these should be coupled with water-column and surface-circulation data to better interpret the specific relations between shallow and deep circulation patterns. Understanding the generation of benthic nepheloid layers is necessary in order to properly interpret PM distribution and its influence on global biogeochemistry. Other/Unknown Material North Atlantic SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Marine Geology 385 304 327 |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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ftosti |
language |
unknown |
topic |
58 GEOSCIENCES |
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58 GEOSCIENCES Gardner, Wilford D. Tucholke, Brian E. Richardson, Mary Jo Biscaye, Pierre E. Benthic storms, nepheloid layers, and linkage with upper ocean dynamics in the western North Atlantic |
topic_facet |
58 GEOSCIENCES |
description |
Benthic storms are episodic periods of strong abyssal currents and intense, benthic nepheloid (turbid) layer development. In order to interpret the driving forces that create and sustain these storms, we synthesize measurements of deep ocean currents, nephelometer-based particulate matter (PM) concentrations, and seafloor time-series photographs collected during several science programs that spanned two decades in the western North Atlantic. Benthic storms occurred in areas with high sea-surface eddy kinetic energy, and they most frequently occurred beneath the meandering Gulf Stream or its associated rings, which generate deep cyclones, anticyclones, and/or topographic waves; these create currents with sufficient bed-shear stress to erode and resuspend sediment, thus initiating or enhancing benthic storms. Occasionally, strong currents do not correspond with large increases in PM concentrations, suggesting that easily erodible sediment was previously swept away. Periods of moderate to low currents associated with high PM concentrations are also observed; these are interpreted as advection of PM delivered as storm tails from distal storm events. Outside of areas with high surface and deep eddy kinetic energy, benthic nepheloid layers are weak to non-existent, indicating that benthic storms are necessary to create and maintain strong nepheloid layers. Origins and intensities of benthic storms are best identified using a combination of time-series measurements of bottom currents, PM concentration, and bottom photographs, and these should be coupled with water-column and surface-circulation data to better interpret the specific relations between shallow and deep circulation patterns. Understanding the generation of benthic nepheloid layers is necessary in order to properly interpret PM distribution and its influence on global biogeochemistry. |
author |
Gardner, Wilford D. Tucholke, Brian E. Richardson, Mary Jo Biscaye, Pierre E. |
author_facet |
Gardner, Wilford D. Tucholke, Brian E. Richardson, Mary Jo Biscaye, Pierre E. |
author_sort |
Gardner, Wilford D. |
title |
Benthic storms, nepheloid layers, and linkage with upper ocean dynamics in the western North Atlantic |
title_short |
Benthic storms, nepheloid layers, and linkage with upper ocean dynamics in the western North Atlantic |
title_full |
Benthic storms, nepheloid layers, and linkage with upper ocean dynamics in the western North Atlantic |
title_fullStr |
Benthic storms, nepheloid layers, and linkage with upper ocean dynamics in the western North Atlantic |
title_full_unstemmed |
Benthic storms, nepheloid layers, and linkage with upper ocean dynamics in the western North Atlantic |
title_sort |
benthic storms, nepheloid layers, and linkage with upper ocean dynamics in the western north atlantic |
publishDate |
2024 |
url |
http://www.osti.gov/servlets/purl/1534072 https://www.osti.gov/biblio/1534072 https://doi.org/10.1016/j.margeo.2016.12.012 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
http://www.osti.gov/servlets/purl/1534072 https://www.osti.gov/biblio/1534072 https://doi.org/10.1016/j.margeo.2016.12.012 doi:10.1016/j.margeo.2016.12.012 |
op_doi |
https://doi.org/10.1016/j.margeo.2016.12.012 |
container_title |
Marine Geology |
container_volume |
385 |
container_start_page |
304 |
op_container_end_page |
327 |
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1790603934537089024 |