Fine-scale water mass variability inside a narrow submarine canyon (the Besòs Canyon) in the NW Mediterranean Sea
In this work we report short-term measurements of the thermohaline structure and velocity field inside a narrow submarine canyon by means of a yo-yo–like profiler. An Aqualog profiler was deployed inside the Besòs Canyon in the northwestern Mediterranean continental margin, providing a unique data s...
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Consejo Superior de Investigaciones Científicas
2016-09-01
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doaj-3245af074fb44ff7b962204d29f15fd72021-05-05T13:49:34ZengConsejo Superior de Investigaciones CientíficasScientia Marina0214-83581886-81342016-09-0180S119520410.3989/scimar.04322.05A1639Fine-scale water mass variability inside a narrow submarine canyon (the Besòs Canyon) in the NW Mediterranean SeaJordi Solé0Mikhail Emelianov1Alexander Ostrovskii2Pere Puig3Emilio García-Ladona4Institut de Ciències del Mar, CSICP.P. Shirshov Institute of Oceanology, Russian Academy of Sciences NakhimovskyP.P. Shirshov Institute of Oceanology, Russian Academy of Sciences NakhimovskyInstitut de Ciències del Mar, CSICInstitut de Ciències del Mar, CSICIn this work we report short-term measurements of the thermohaline structure and velocity field inside a narrow submarine canyon by means of a yo-yo–like profiler. An Aqualog profiler was deployed inside the Besòs Canyon in the northwestern Mediterranean continental margin, providing a unique data set on the vertical evolution of water column characteristics with unprecedented fine-scale spatial and temporal resolution. The observations reported here show a very dynamic transient short-term response with a complex vertical structure not observed previously in any submarine canyon of this region. The vertical distribution of water masses was characteristic of the western Mediterranean basin with Atlantic waters (AW) at the surface, Western Intermediate waters (WIW) in the middle and Levantine Intermediate (LIW) waters below. Turner angle and empirical orthogonal functions show that double-diffusive and isopycnal mixing are the main dominant processes at small scales. The interfaces of the three layers exhibit highly vertical excursions in relatively short times. At the surface, deepening of AW was observed, associated with flow intensification events. Deeper in the water column, within the submarine canyon confinement, the WIW-LIW interface uplifts about 100-150 m. These motions are associated with relatively up- and down-canyon–enhanced current events (up to 15-20 cm s-1 at 500 and 800 m depths) along the canyon axis. The time scales of the vertical variability were concentrated in a broad band around the semi-diurnal and local inertial frequencies within the WIW and LIW layers.http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/1668fine-scale variabilitysubmarine canyonyo-yo like profilerthermohaline structureawwiwliw |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Jordi Solé Mikhail Emelianov Alexander Ostrovskii Pere Puig Emilio García-Ladona |
spellingShingle |
Jordi Solé Mikhail Emelianov Alexander Ostrovskii Pere Puig Emilio García-Ladona Fine-scale water mass variability inside a narrow submarine canyon (the Besòs Canyon) in the NW Mediterranean Sea Scientia Marina fine-scale variability submarine canyon yo-yo like profiler thermohaline structure aw wiw liw |
author_facet |
Jordi Solé Mikhail Emelianov Alexander Ostrovskii Pere Puig Emilio García-Ladona |
author_sort |
Jordi Solé |
title |
Fine-scale water mass variability inside a narrow submarine canyon (the Besòs Canyon) in the NW Mediterranean Sea |
title_short |
Fine-scale water mass variability inside a narrow submarine canyon (the Besòs Canyon) in the NW Mediterranean Sea |
title_full |
Fine-scale water mass variability inside a narrow submarine canyon (the Besòs Canyon) in the NW Mediterranean Sea |
title_fullStr |
Fine-scale water mass variability inside a narrow submarine canyon (the Besòs Canyon) in the NW Mediterranean Sea |
title_full_unstemmed |
Fine-scale water mass variability inside a narrow submarine canyon (the Besòs Canyon) in the NW Mediterranean Sea |
title_sort |
fine-scale water mass variability inside a narrow submarine canyon (the besòs canyon) in the nw mediterranean sea |
publisher |
Consejo Superior de Investigaciones Científicas |
series |
Scientia Marina |
issn |
0214-8358 1886-8134 |
publishDate |
2016-09-01 |
description |
In this work we report short-term measurements of the thermohaline structure and velocity field inside a narrow submarine canyon by means of a yo-yo–like profiler. An Aqualog profiler was deployed inside the Besòs Canyon in the northwestern Mediterranean continental margin, providing a unique data set on the vertical evolution of water column characteristics with unprecedented fine-scale spatial and temporal resolution. The observations reported here show a very dynamic transient short-term response with a complex vertical structure not observed previously in any submarine canyon of this region. The vertical distribution of water masses was characteristic of the western Mediterranean basin with Atlantic waters (AW) at the surface, Western Intermediate waters (WIW) in the middle and Levantine Intermediate (LIW) waters below. Turner angle and empirical orthogonal functions show that double-diffusive and isopycnal mixing are the main dominant processes at small scales. The interfaces of the three layers exhibit highly vertical excursions in relatively short times. At the surface, deepening of AW was observed, associated with flow intensification events. Deeper in the water column, within the submarine canyon confinement, the WIW-LIW interface uplifts about 100-150 m. These motions are associated with relatively up- and down-canyon–enhanced current events (up to 15-20 cm s-1 at 500 and 800 m depths) along the canyon axis. The time scales of the vertical variability were concentrated in a broad band around the semi-diurnal and local inertial frequencies within the WIW and LIW layers. |
topic |
fine-scale variability submarine canyon yo-yo like profiler thermohaline structure aw wiw liw |
url |
http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/1668 |
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