A spar buoy-mounted ADCP measurement station in the Ligurian Sea: a metrological approach to correct current measures for bias effects and evaluate uncertainties.

Since the '70s, the ENEA Marine Environment Research Centre of S. Teresa has been involved in monitoring and analysis of physical, chemical and biological processes in marine environment. In order to provide a deeper view of the real marine dynamics, based on the integrated use of data and models, some of these activities have been recently focused on the measurement of current profiles in the open sea. A dedicated experimental methodology and data analysis were carried out to design and install a system for measuring current profiles in the surface layer in the Ligurian Sea: the measurement station, based on an Acoustic Doppler Current Profiler (ADCP) mounted on the W1-M3A (Western 1 Mediterranean Moored Multisensor ) weather-oceanographic observatory led to the acquisition of a time series of data continuously acquired for five months. The collected dataset, together with the implemented post-processing techniques, were aimed to realize a monitoring system able to support (and verify by comparison) marine current numerical models, with the final purpose of improving their performances. Critical points of this experimental activities were both the correction of bias effects due to the platform influence on ADCP measures and the evaluation of the overall uncertainty associated with the current velocities. In the present work, some details of the performed activity are briefly described, ranging from the design of the measuring station to its implementation, from recovery to data processing