Dynamics at an elongated, intermediate depth seamount in the North Atlantic (Sedlo Seamount, 40°20′N, 26°40′W)
11 pages, 11 figures, 1 table Observations from a five-mooring array deployed in the vicinity of Sedlo Seamount over a 4-month period, together with supporting hydrographic and underway ADCP measurements, are described. Sedlo Seamount is an elongated, intermediate depth seamount with three separate...
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
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Online Access: | http://hdl.handle.net/10261/19293 https://doi.org/10.1016/j.dsr2.2008.12.037 |
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ftcsic:oai:digital.csic.es:10261/19293 2024-02-11T10:06:48+01:00 Dynamics at an elongated, intermediate depth seamount in the North Atlantic (Sedlo Seamount, 40°20′N, 26°40′W) Mohn, Christian White, Martin Bashmachnikov, Igor Jose, Felix Pelegrí, Josep Lluís 2009-12 8985 bytes application/pdf http://hdl.handle.net/10261/19293 https://doi.org/10.1016/j.dsr2.2008.12.037 en eng Elsevier https://doi.org/10.1016/j.dsr2.2008.12.037 Deep-Sea Research Part II: Topical Studies in Oceanography 56(25): 2582-2592 (2009) 0967-0645 http://hdl.handle.net/10261/19293 doi:10.1016/j.dsr2.2008.12.037 none Seamount dynamics Taylor Cones Sedlo Seamount Vortex pair artículo http://purl.org/coar/resource_type/c_6501 2009 ftcsic https://doi.org/10.1016/j.dsr2.2008.12.037 2024-01-16T09:24:41Z 11 pages, 11 figures, 1 table Observations from a five-mooring array deployed in the vicinity of Sedlo Seamount over a 4-month period, together with supporting hydrographic and underway ADCP measurements, are described. Sedlo Seamount is an elongated, intermediate depth seamount with three separate peaks, rising from 2200 m water depth to summit peaks between 950 and 780 m depth, located at 40°20′N, 26°40W. Currents measured in depth range 750 and 820 m – the layer close to the summit depth of the shallowest southeast peak – showed a mean anti-cyclonic flow around the seamount, with residual current velocities of 2–5 cm s−1. Significant mesoscale variability was present at this level, and this is attributed to the weak and variable background impinging flow. Stronger, more persistent currents were found at the summit mooring as a result of tidal rectification and some weak amplification. Below 1300 m, currents were extremely weak, even close to the seabed. Time series of relative vorticity for the depth layer 750–820 m showed persistent anti-cyclonic vorticity except for two periods of cyclonic vorticity. A mean relative vorticity of −0.06f (f=the local Coriolis frequency) was calculated from a triangle of current meters located at the flanks of the seamount. Modelling results confirmed that anti-cyclonic flow above the seamount was likely due to Taylor Cone generation driven by a combination of steady impinging and tidally rectified flow. The closed circulation pattern over the seamount was found to extend to not, vert, similar150 m above the summit level, consistent with simple idealised theory and the supporting hydrographic observations. At shallower depths (<500 m) model simulations predicted a predominantly cyclonic recirculation most likely controlled by topographic steering along the zonal axis of the seamount. There was some indication of flow reversal at these depths from Acoustic Doppler Current Profiler (ADCP) measurements carried out at one hydrographic survey. The model results were in good ... Article in Journal/Newspaper North Atlantic Digital.CSIC (Spanish National Research Council) Deep Sea Research Part II: Topical Studies in Oceanography 56 25 2582 2592 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
Seamount dynamics Taylor Cones Sedlo Seamount Vortex pair |
spellingShingle |
Seamount dynamics Taylor Cones Sedlo Seamount Vortex pair Mohn, Christian White, Martin Bashmachnikov, Igor Jose, Felix Pelegrí, Josep Lluís Dynamics at an elongated, intermediate depth seamount in the North Atlantic (Sedlo Seamount, 40°20′N, 26°40′W) |
topic_facet |
Seamount dynamics Taylor Cones Sedlo Seamount Vortex pair |
description |
11 pages, 11 figures, 1 table Observations from a five-mooring array deployed in the vicinity of Sedlo Seamount over a 4-month period, together with supporting hydrographic and underway ADCP measurements, are described. Sedlo Seamount is an elongated, intermediate depth seamount with three separate peaks, rising from 2200 m water depth to summit peaks between 950 and 780 m depth, located at 40°20′N, 26°40W. Currents measured in depth range 750 and 820 m – the layer close to the summit depth of the shallowest southeast peak – showed a mean anti-cyclonic flow around the seamount, with residual current velocities of 2–5 cm s−1. Significant mesoscale variability was present at this level, and this is attributed to the weak and variable background impinging flow. Stronger, more persistent currents were found at the summit mooring as a result of tidal rectification and some weak amplification. Below 1300 m, currents were extremely weak, even close to the seabed. Time series of relative vorticity for the depth layer 750–820 m showed persistent anti-cyclonic vorticity except for two periods of cyclonic vorticity. A mean relative vorticity of −0.06f (f=the local Coriolis frequency) was calculated from a triangle of current meters located at the flanks of the seamount. Modelling results confirmed that anti-cyclonic flow above the seamount was likely due to Taylor Cone generation driven by a combination of steady impinging and tidally rectified flow. The closed circulation pattern over the seamount was found to extend to not, vert, similar150 m above the summit level, consistent with simple idealised theory and the supporting hydrographic observations. At shallower depths (<500 m) model simulations predicted a predominantly cyclonic recirculation most likely controlled by topographic steering along the zonal axis of the seamount. There was some indication of flow reversal at these depths from Acoustic Doppler Current Profiler (ADCP) measurements carried out at one hydrographic survey. The model results were in good ... |
format |
Article in Journal/Newspaper |
author |
Mohn, Christian White, Martin Bashmachnikov, Igor Jose, Felix Pelegrí, Josep Lluís |
author_facet |
Mohn, Christian White, Martin Bashmachnikov, Igor Jose, Felix Pelegrí, Josep Lluís |
author_sort |
Mohn, Christian |
title |
Dynamics at an elongated, intermediate depth seamount in the North Atlantic (Sedlo Seamount, 40°20′N, 26°40′W) |
title_short |
Dynamics at an elongated, intermediate depth seamount in the North Atlantic (Sedlo Seamount, 40°20′N, 26°40′W) |
title_full |
Dynamics at an elongated, intermediate depth seamount in the North Atlantic (Sedlo Seamount, 40°20′N, 26°40′W) |
title_fullStr |
Dynamics at an elongated, intermediate depth seamount in the North Atlantic (Sedlo Seamount, 40°20′N, 26°40′W) |
title_full_unstemmed |
Dynamics at an elongated, intermediate depth seamount in the North Atlantic (Sedlo Seamount, 40°20′N, 26°40′W) |
title_sort |
dynamics at an elongated, intermediate depth seamount in the north atlantic (sedlo seamount, 40°20′n, 26°40′w) |
publisher |
Elsevier |
publishDate |
2009 |
url |
http://hdl.handle.net/10261/19293 https://doi.org/10.1016/j.dsr2.2008.12.037 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://doi.org/10.1016/j.dsr2.2008.12.037 Deep-Sea Research Part II: Topical Studies in Oceanography 56(25): 2582-2592 (2009) 0967-0645 http://hdl.handle.net/10261/19293 doi:10.1016/j.dsr2.2008.12.037 |
op_rights |
none |
op_doi |
https://doi.org/10.1016/j.dsr2.2008.12.037 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
56 |
container_issue |
25 |
container_start_page |
2582 |
op_container_end_page |
2592 |
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