RESOLAG is a sensor network located in French Polynesia, in the middle of the South Pacific Ocean. The program started in 2018 to acquire data on seawater parameter inside lagoon impacted by pearl oyster farming activity. It is a long-term monitoring of seawater temperature, disolve oxygen, turbidity, fluorescence and salinity. One of the network’s major goal is to better understand the link between black-pearl oysters and their environment, in order to improve management of the farming activity. RESOLAG was created by the Department for Marine Ressources Management of French Polynesia. It is a public organisation run by the gouvernment of French Polynesia. Therefore all data from the network are publicly available to download (under CC-BY licence). 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.

The objective of the TONGA oceanographic expedition was to study the control of productivity and carbon sequestration by micronutrients of shallow hydrothermal origin in the Western Tropical South Pacific (WTSP) Ocean. The 37-day oceanographic survey took place on board the R/V L’Atalante in 2019 between Oct. 31 to Dec. 6 (Nouméa-Nouméa). Over a large area of the WTSP the team acquired numerous results on both the entire water column (up to the sediment) and the atmosphere. Specific task are represented on figure 1: (task 1) to characterize chemically and optically shallow hydrothermal fluids and to compare the source from below (shallow hydrothermal fluids) with the source from above (atmospheric deposition); (task 2) to quantify the dynamical dispersion of the fluids at small and regional scale; (task 3) to investigate the impact of the shallow hydrothermal sources on the biological activity and diversity, and the feedback to the atmosphere via the oceanic emissions of primary and secondary aerosols. (Task 4) to communicate about the campaign (see for example our Tweeter account (https://www.youtube.com/watch?v=UeABf-cVR-k). A long west to east (up to the blue waters of the gyre) transect allowed to characterize the different biogeochemical provinces crossed and a focus in the region of the Lau Basin allowed to investigate the impact of shallow hydrothermal sources. A series of short and long stations allowed to fully characterize the stocks and the fluxes in the different provinces. Short-term (up to 10 days) processes studies have been conducted (drifting moorings and minicosms experiments). Part of these results will feed into important modeling work. A fixed mooring line launched at the end of the campaign and recovered in Nov. 2020 as well as the 7 ARGO floats and 20 drifting buoys that were dropped during the campaign provide a broader temporal context of the acquisitions done during the campaign. An important focus of the campaign was the trace metal characterization of the entire water column. For this, TONGA has been labeled by the international program GEOTRACES (https://www.geotraces.org/). The impact on biological communities of fluids is supported by the international IMBER program (https://imber.info/). The TONGA project is also part of the LEFE program (funding by LEFE-CYBER and LEFE-GMMC), the ANR (Appel à projets génériques) and the Fondation A-MIDeX of the Aix-Marseille Université. Scheme of the different tasks of the TONGA project and cruise Image Reference: https://www.seanoe.org/data/00770/88169/illustrations/illustration-148.gif. 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.

As part of the ongoing PHANTOM (Poleward Heat Transport across the ACC) program of LOCEAN/Sorbonne University, we have recently occupied two full-depth Conductivity-Temperature-Depth (CTD) sections in the Udintsev Fracture Zone region during a current-meter mooring deploying cruise in February 2016 and a mooring recovery cruise in December 2017 on board the Korean icebreaker Araon, in collaboration with physical teams of Korea Polar Research Institute (KOPRI) and Korea Institute of Ocean Science and Technology (KIOST). Several hydrographic sections have been made in the upstream and downstream areas of the UFZ especially during the 1990s World Ocean Circulation Experiment (WOCE) period, such as WOCE P16 at 150°W and WOCE P17 at 135°W. However, no high-quality top-to-bottom hydrography has ever been performed in the UFZ itself at 144°W, despite its narrowest circumpolar choke point. Ref: Park et al. (2019), Observations of the Antarctic Circumpolar Current over the Udintsev Fracture Zone, the narrowest choke point in the Southern Ocean, JGR, in review. 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.

An up-to-date map of the Antarctic Circumpolar Current (ACC) fronts is constructed from the latest version of mean dynamic topography from satellite altimetry (Park et al., 2019, Observations of the Antarctic Circumpolar Current over the Udintsev Fracture Zone, the narrowest choke point in the Southern Ocean, JGR-Oceans, in review). These are derived from the 1/8°-resolution Mean Dynamic Topography (MDT) of Centre National d’Etudes Spatiales-Collect Localisation Satellites 2018 (CNES-CLS18) for the 1993-2012 reference period [(Rio)-[https://motu.aviso.altimetry.fr/motu-web/Motu] et al., The new CNES-CLS18 Mean Dynamic Topography solution, in preparation]. The narrowest ACC width in the Udintsev Fracture Zone (UFZ), with the strongest concentration of the three major ACC fronts within a limited distance as short as 170 km, about 40% narrower than that at Drake Passage. At 144°W, at the entrance of the UFZ, which lies between the Pacific-Antarctic Ridge (PAR) and its eastwardly-offset segment (offset PAR segment), there is a triple confluence of the Subantarctic Front (SAF), Polar Front (PF), and Southern ACC Front. Downstream of this longitude, the SAF progressively meanders northward over the relatively shallow offset PAR segment before channeling through the Eltanin Fracture Zone, thus diverging from the PF which proceeds through the UFZ. 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.

The provided unique microplastic data was generated from the Leg 0,1,2,3,4,6,7,8,9,10,11 and 12 of the Volvo Ocean Race 2017/18. The samples were collected onboard "Turn the Tide on Plastic" (all Legs) and team "AkzoNobel" (Leg 7 and 9 till 11). The extraction of the stainless-steel filter cakes was performed in reference to Lenz et al. 2015 with ultrasonication. The solutions were measured with a microfluidic flow capillary Raman spectrometer in reflection mode and further analysed with holography. The data variables include GPS position, time, filter volume [L], measured microplastic concentration [particles/m³], error of microplastic concentration [particles/m³], Leg Number and yacht (1 = Turn the Tide on Plastic, 2 = AkzoNobel). Related in-situ oceanographic measurements are uploaded to the NOAA NCEI S2N database (NCEI Accession 0170967). The instrument used for underway measurements was the specially built OceanPack RACE manufactured by SubCtech GmbH in Kiel. The connected microplastic filtration unit and lab analysis prototype for microplastic (Raman) was built by bbe Moldaenke. The mixed-layer surface water (~1.5 m depending on the heel of the yachts) was sampled in the Mediterranean Sea, the North and South Atlantic Ocean, South Indian Ocean, West and South Pacific Ocean and others from 2017-10-22 to 2018-07-07. Measurements were performed by GEOMAR and acknowledgements go to the Cluster of Excellence Future Ocean (Funding for the Project and Position of Dr.-Ing. Sören B. Gutekunst), Volvo Cars, teams Turn the Tide on Plastic/AkzoNobel, the Volvo Ocean Race sustainability programme, bbe Moldaenke GmbH and SubCtech GmbH. Leg overview and yacht samples: Leg 0: Lisbon to Alicante/Spain TTOP Leg 1: Alicante to Lisbon/Portugal TTOP Leg 2: Lisbon to Cape Town/South Africa TTOP Leg 3: Cape Town to Melbourne/Australia TTOP Leg 4: Melbourne to Hong Kong/China TTOP Leg 5: not sampled - Leg 6: Hong Kong to Auckland/New Zealand TTOP Leg 7: Auckland to Itajaí/Brazil TTOP & AN Leg 8: Itajaí to Newport/U.S.A. TTOP Leg 9: Newport to Cardiff/U.K. TTOP & AN Leg 10: Cardiff to Gothenburg/Sweden TTOP & AN Leg 11 Gothenburg to The Hague/Netherlands TTOP & AN Leg 12: The Hague to Lisbon/Portugal TTOP In addition to the Marine Litter data also weather observations were collected and these are available from: https://data.nodc.noaa.gov/cgi-bin/iso?id=gov.noaa.nodc:0170967