Dynamics at an elongated, intermediate depth seamount in the North Atlantic (Sedlo Seamount, 40°20′N, 26°40′W)

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

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Bibliographic Details
Main Authors: Mohn, Christian, White, Martin, Bashmachnikov, Igor, Jose, Felix, Pelegrí, Josep Lluís
Format: artículo biblioteca
Language:English
Published: Elsevier 2009-12
Subjects:Seamount dynamics, Taylor Cones, Sedlo Seamount, Vortex pair,
Online Access:http://hdl.handle.net/10261/19293
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spelling dig-icm-es-10261-192932020-11-19T09:14:08Z 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 Seamount dynamics Taylor Cones Sedlo Seamount Vortex pair 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 agreement with observations at the seamount summit, but were unable to reproduce the mesoscale variability patterns recorded in shallower layers. Kinetic energy patterns derived from the model revealed high variability in the oceanic far field downstream of the seamount summit probably as a result of complex flow interaction along the chain of seamount peaks. Possible impacts of the flow dynamics on the biological functioning at Sedlo Seamount and its surroundings are discussed This work was completed thanks to the support of the EU Project OASIS, Contract number EVK3-CT-2002-00073-OASIS. We thank Dr. Bernd Christiansen for his great work as coordinator of the OASIS project Peer reviewed 2009-12-03T09:15:19Z 2009-12-03T09:15:19Z 2009-12 artículo http://purl.org/coar/resource_type/c_6501 Deep-Sea Research Part II: Topical Studies in Oceanography 56(25): 2582-2592 (2009) 0967-0645 http://hdl.handle.net/10261/19293 10.1016/j.dsr2.2008.12.037 en https://doi.org/10.1016/j.dsr2.2008.12.037 none 8985 bytes application/pdf Elsevier
institution ICM ES
collection DSpace
country España
countrycode ES
component Bibliográfico
access En linea
databasecode dig-icm-es
tag biblioteca
region Europa del Sur
libraryname Biblioteca del ICM España
language English
topic Seamount dynamics
Taylor Cones
Sedlo Seamount
Vortex pair
Seamount dynamics
Taylor Cones
Sedlo Seamount
Vortex pair
spellingShingle Seamount dynamics
Taylor Cones
Sedlo Seamount
Vortex pair
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)
description 11 pages, 11 figures, 1 table
format artículo
topic_facet Seamount dynamics
Taylor Cones
Sedlo Seamount
Vortex pair
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 2009-12
url http://hdl.handle.net/10261/19293
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