FN Archimer Export Format
PT J
TI Strong hydrodynamic processes observed in the Mediterranean Cassidaigne submarine canyon
BT 
AF BRUN, Lenaig
   PAIRAUD, Ivane
   SILVA JACINTO, Ricardo
   GARREAU, Pierre
   DENNIELOU, Bernard
AS 1:1;2:1;3:2;4:1;5:2;
FF 1:PDG-ODE-LOPS-OC;2:PDG-ODE-LOPS-OC;3:PDG-REM-GEOOCEAN-ASTRE;4:PDG-ODE-LOPS-OC;5:PDG-REM-GEOOCEAN-ASTRE;
C1 fremer, University of Brest, UMR 6523 CNRS, IRD, Laboratoire d’Océanographie Physique et Spatiale, Plouzané, France
   Ifremer, Geo-Ocean, University of Brest, CNRS, UMR 6538, Plouzané, France
C2 IFREMER, FRANCE
   IFREMER, FRANCE
SI BREST
SE PDG-ODE-LOPS-OC
   PDG-REM-GEOOCEAN-ASTRE
UM LOPS
   GEO-OCEAN
IN WOS Ifremer UMR
   DOAJ
IF 3.7
TC 1
UR https://archimer.ifremer.fr/doc/00819/93128/99627.pdf
   https://archimer.ifremer.fr/doc/00819/93128/99628.pdf
LA English
DT Article
CR CASSISED 2019 - 1-3
   CASSISED 2019 - 4
   UPCAST
BO L'Europe
   Téthys II
DE ;circulation;submarine canyon;Cassidaigne;Mediterranean Sea;upwelling;Northern Current;turbidity current;morphology
AB Introduction: Submarine canyons are incisive morphologies that play an important role in the exchange between shallow and deep waters. They interact with the general circulation and induce a specific circulation locally oriented by the morphology. The characteristics of the physical processes at play, the way they interact with each other and the influence of extreme events is still an open question as few observations are available. To answer this question and to improve the representation of submarine canyons in numerical models, it is key to understand the specific circulation patterns and their transitions in these specific environments. Methods: This paper presents observations of currents, temperature and turbidity along the Cassidaigne canyon, northwestern Mediterranean Sea. Two oceanographic cruises carried out in 2017 and 2019 gathered data from the outer shelf and canyon head at 100-400 m depth to the base of the continental slope at 1900 m depth. Results and Discussion: The circulation in the Cassidaigne area is subject to upwelling and downwelling-favorable winds, to the Northern Current and its associated mesoscale structures and is oriented by the local morphology. Upwellings occur both during stratified and non-stratified conditions. They are triggered by a wind forcing higher than 14 m s–1 and their consecutive relaxations are marked by a counter-current. Near the canyon head and on the shelf, the current orientation depends on the stratification, the wind, the bottom morphology and the general circulation. The mesoscale variability of the Northern Current can lead to its intrusion over the shelf leading to barotropic cross currents over the canyon. At 1700 m depth, a quasi-permanent residual up-canyon flow is observed in a narrow gorge area and can be extrapolated to the canyon body. Finally, turbidity currents were observed for the first time in connection with upwelling events, suggesting the key role of canyons’ internal hydrodynamics on shelf sedimentary processes. 
PY 2023
PD FEB
SO Frontiers In Marine Science
SN 2296-7745
PU Frontiers Media
VL 10
UT 000937718400001
DI 10.3389/fmars.2023.1078831
ID 93128
ER

EF