Dina Eparkhina¹, Elisa Banchi², Donata Canu³, Ángel Borja⁴, Andrew King⁵, Daria Ezgeta-Balić⁶, Panayota Koulouri⁷, Marina Locritani⁸, Marta Manca Zeichen⁹, Angela Pomaro¹⁰, Francesca Petrera¹¹, Maria C. Uyarra⁴ and Louise Valestrand¹², (1)European Global Ocean Observing System (EuroGOOS), Brussels, Belgium, (2)National Institute of Oceanography and Applied Geophysics OGS, Trieste, Italy, (3)National Institute of Oceanography and Applied Geophysics - OGS, Trieste, Italy, (4)AZTI, Marine Research Division, Basque Research and Technology Alliance (BRTA), Gipuzkoa, Spain, (5)Norwegian Institute for Water Research, Oslo, Norway, (6)Institute of Oceanography and Fisheries, Split, Croatia, (7)Hellenic Centre for Marine Research (HCMR), Institute of Marine Biology, Biotechnology and Aquaculture (IMBBC), Heraklion, Greece, (8)Istituto Nazionale di Geofisica e Vulcanologia, Pozzuolo di Lerici, Italy, (9)Italian National Institute for Environmental Protection and Research (ISPRA), Rome, Italy, (10)National Research Council of Italy (CNR), Institute of Marine Sciences (ISMAR), Venice, Italy, (11)National Institute of Oceanography and Applied Geophysics (OGS), Sgonico-Trieste, Italy, (12)Norwegian Institute for Water Research (NIVA), Oslo, Norway