The objective of the second (final) scientific report on Observation System Experiments (Deliverable D9.5) is to assess the impact of existing observational platforms on estimates of coastal processes through the work done within JERICO WP9.2 and thus to contribute to the future strategy for coastal observatories at the coastal scale. To this end, OSE studies can provide valuable information on evaluating the different components of the present-day observing system.The experiments reported here by DMI, CMCC, HCMR, HZG, DELTARES and MUMM are applied in most European coastal areas (Baltic Sea, Adriatic Sea, Aegean Sea and the North Sea) using different 3D circulation models (HIROBM, NEMO, POM, GETM, DCSM, COHERENS) implemented at a high spatial resolution and accompanied by data assimilation systems of different complexity (ranging from Optimal Interpolation to Ensemble Kalman filtering) to blent model solutions with the available observational data sets. In what follows the results of OSE studies are reported for the Baltic Sea (DMI), Adriatic Sea (CMCC), Aegean Sea (HCMR) and the North Sea (HZG, DELTARES & MUMM) using different observing systems ranging from T/S profiles from CTD casts and fixed platforms (Baltic Sea, North Sea), temperature profiles from the Fishing Vessels Observing System (Adriatic Sea), tide gauges (North Sea), HF Radars (North Sea, Aegean Sea) and FerryBox systems (Aegean Sea).

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