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Radioactivity in the water column

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    The NUREIEV1 cruise targets the main objective of testing the hypothesis that sea storms are the main trigger for the transfer of matter and energy, including pollutants and litter, from the coastal to the deep ocean in the SE of Spain (36º20’N to 37º36’N and 2º40’W to 0º40’W). A dedicated strategy was performed during the NUREIEV1 cruise to achieve the objective including: 1) the collection of sediment cores (multicores and gravity cores) in the vicinity of the mine tailings deposit near the Portman Bay 2) the deployment of mooring lines with automated sediment traps and currentmeters to monitor particle fluxes (including pollutants released from the mine tailings deposit) and near bottom oceanographic parameters (current speed and directions, temperature, transmissivity), 3) the profiling of the water column (either from the ship by means of a CTD and from a little boat in the shallower stations) to study physico-chemical characteristics of the water column including dissolved trace elements and radiosotopes 4) the collection of floating debris including microplastics from surface waters 5) and the high resolution swath mapping and TOPAS profiling to investigate seafloor features.

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    The main objectives for the MedSeA cruise are to: - Refine climatological maps of carbonate species distribution (pH, pCO2, CO32-, CT, AT, CaCO3 saturation states), along with their isotopic signatures, in the Mediterranean Sea. - Report on the determination of the anthropogenic carbon distribution throughout the whole Mediterranean Sea and its associated uncertainty estimate - Determine the effects of carbonate chemistry on Mediterranean calcifying and non-calcifying planktonic organisms. - Determine synergistic effects of acidification, warming and nutrients on key pelagic organisms. - Identify and quantify responses of fundamental Mediterranean biogeochemical processes to acidification and warming. - MedSeA is carried out in collaboration with the Geotraces program in order to collect water for chemical large volume trace elements and isotopes such as Th/Pa, Artificial radionuclides, Th-234, Nd-isotopes and Ra.