A cluster of 20 CARTHE-type drifters were deployed in the open sea area in front of Livorno (Italy) on October 8, 2020. The deployment was part of the DDR20- "Drifter demonstration and Research 2020" experiment performed in collaboration with the CMRE-NATO and Consorzio LaMMA, and supported by many EU projects, such as SICOMAR plus, JERICO-S3, SINAPSI, and IMPACT. CARTHE-type drifters are biodegradable drifters, spanning the first 60cm of the water column (Novelli 2017, 2018, 2020). The deployment strategy consisted of releasing drifters on a regular grid (about 3km side and 500m step) in a time window of about 2 hours. 5 drifters heading south were collected on October 10, 2020 and re-deployed, on the same day, approx. 2.5 nm to the north of the initial deployment area. 3 stranded drifters were redeployed on November 11, 2020 in the open sea area in front of the La Spezia Gulf. Each file contains a drifter trajectory in the NetCDF format (ex: 001.nc, 002.nc, etc...). Trajectories of those drifters that were collected and re-deployed are splitted in different files (ex: 001_a.nc, 001_b.nc). Nominal drifter transmission rate: 10 minutes. Positions available until January 23, 2021. The dataset includes raw positions; outliers were removed.   References: • Novelli, G., C.M. Guigand, C. Cousin, E. Ryan, N. Laxague, H. Dai, B. Haus, and T.M. Özgökmen (2017). A biodegradable surface drifter for ocean sampling on a massive scale. J. Atmos. Oceanic Technol., 34(11), 2509-2532. • Novelli, G., C.M. Guigand, T.M. Özgökmen (2018). Technological Advances in Drifters for Oil Transport Studies. Marine Technology Society Journal, 52(6), 53-61. • Novelli, G, C.M. Guigand, M. Boufadel, T.M. Özgökmen (2020). On the transport and landfall of marine oil spills, laboratory and field observations. Marine Pollution Bulletin, 150, 110805. • http://interreg-maritime.eu/web/sicomarplus • https://www.jerico-ri.eu/ • http://interreg-maritime.eu/web/sinapsi • http://interreg-maritime.eu/web/impact   Important Note: This submission has been initially submitted to SEA scieNtific Open data Edition (SEANOE) publication service and received the recorded DOI. The metadata elements have been further processed (refined) in EMODnet Ingestion Service in order to conform with the Data Submission Service specifications.

During the World Ocean circulation experiment, 100 MARVOR floats were launched near 800 dbar mostly in the Brazil basin, within the framework of SAMBA (SubAntartic Motions in the Brazil bAsin).This experiment aimed at describing the absolute general circulation of the Antarctic Intermediate Water around 800 m depth in the South Atlantic. MARVOR floats cycled every 2 (or 3) months between their nominal depth and surface to transmit data via the ARGOS system and were programmed for 30 (or 20) cycles, i.e. a total life of 5 years.

The time series data consist of 7 sets of trajectories for drifters which were released between 17th and 23rd September 1996. Each deployment used two drifters, one at a depth of 5m and another at 30m. The drifters were deployed off the coast of Cirkewwa. The measurements were made in connection with an oceanographic survey commissioned by Water Services Corporation with the intention of studying the hydrographic characteristics of this marine area for the purpose of a sewage outfall.