Description
The leg 1 of the NUREIEV 3 oceanographic cruise took place from 22 to 30 April 2016. The area of work has located on the continental margin of the SE of Iberian Peninsula, off the coast of Murcia and Almeria, with reference coordinates from 36o20'N to 37o36'N and 2o40'W to 0o40'W. The tasks performed consisted of: • Bathymetric mapping with multibeam echosounder for seabed mapping, from inner shelf to upper slope (50 to 1500 m depth). • Geophysical works with TOPAS, very high resolution seismic profiles, to characterize the sedimentary cover of the study area. • Recovery of 5 mooring lines, instrumented for the continuous monitoring of the hydrological (water masses) and sediment (particle fluxes) dynamics from the last cruise in September 2015. Each mooring line is composed by one current meter for measuring temperature, turbidity, velocity and direction of currents and one sediment trap for sampling sinking particles. In addition, each mooring is equipped with an acoustic release for recovery and with suitable buoyancy. Monitoring with instrumented mooring lines has covered an annual cycle, in two phases of 6 months each one. • CTD profiling and water sampling. Profiles have been made in each of the submarine canyons monitored for measuring physical and chemical variables of water column (temperature, salinity, turbidity, oxygen concentration and chlorophyll) and calibration of instruments of mooring lines. • Performing surface sampling of floating microplastics by neuston net. • Sampling of surface sediments by multicorer.
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