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A Pilot experiment on the temporal variability of the nepheloid and dynamical structures in the Besos Canyon (NW Mediterranean Sea)

AuthorsEmelianov, Mikhail CSIC ORCID ; Font, Jordi CSIC ORCID CVN; Puig, Pere CSIC ORCID ; Martín, Jacobo CSIC ORCID; García-Ladona, Emilio CSIC ORCID ; Salat, Jordi CSIC ORCID ; Shvoev, Dmitry
Issue Date26-Nov-2013
CitationIntegrating New Advances in Mediterranean Oceanography and Marine Biology. Meeting program: 58 (2013)
AbstractA pilot experiment aiming at investigating the nepheloid and dynamical structures over the Barcelona continental slope in the Besòs submarine canyon was carried out by using the new moored profiler “Aqualog”. The mooring was deployed at the depth of 808 m at the canyon axis on 23 March 2012 and included also two current meters with turbidimeters at fixed depths. The profiler moved down and up along the line from 60 to 792 m every 4 hours at a speed of 0.17-0.18 m/s. The profiler carried an acoustic Doppler current meter, a CTD probe and a turbidimeter. Pressure, conductivity, temperature and turbidity were measured every second, while the vertical resolution of the current velocity and the acoustic backscatter was about 1.05 m. The profiler operated until April 3. The profiling and fixed current meters data showed very good correlation both for speed and direction. The current speed usually differed by less than 0.02 m/s within the subsurface layer at 40-80 m depth. At 4-5 m above the bottom, the flow often was 1.5-2 times stronger than at 13 m above. No evidence of the bottom Ekman spiral was observed; at the depths of 790-792 m and 803-804 m, the currents were usually directed coherently either northwestward or southeastward. The nepheloid structure became evident in the acoustic backscatter profiles. The vertical distribution of acoustic backscatter was in agreement with the turbidity profile, being at minimum in the cold intermediate layer. The lower boundary of this layer underwent huge oscillations with amplitude of up to 250 m. The amount of the sound backscatterers suspended in the water was usually largest at 400-600 m depth. Several times the amount of the suspended sediments increased for 12 h or so at 600-800 m depth. The obtained results allow to better understanding the nepheloid layers forming processes in the submarine canyons of the NW Mediterranean
DescriptionEmelianov, Mikhail ... et. al.-- Symposium on Integrating New Advances in Mediterranean Oceanography and Marine Biology, 26-29 November 2013, Institut de Ciències del Mar (CSIC), Barcelona, Catalunya, Spain
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