This dataset consists of a quantitative imaging dataset of ZooScan-imaged mesoplankton (> 200 µm), collected with high-speed net aboard the schooner Tara during the Tara Pacific Expedition (2016-2018). Samples were collected at the surface, generally on a daily frequency, across the Atlantic and Pacific Oceans from open-ocean stations (151 samples; open-ocean label: [i00_oa###]) and from stations in coastal waters of 32 Pacific islands (54 samples; island label: [i##_oa###]). The full description and discussion of this dataset can be found in the associated data paper Mériguet et al. (in rev). This dataset consists of 256 352 plankton individuals, plankton parts, non-living particles and imaging artefacts, ranging from 300 µm to a few mm, individually imaged and measured with the ZooScan (Gorsky et al., 2010). The objects were classified into 159 taxonomic and morphological groups. All images and their taxonomic annotations are available in the open-access EcoTaxa (Picheral et al., 2017) project at this link: https://ecotaxa.obs-vlfr.fr/prj/11292. The 'EcoTaxa ZooScan Tara Pacific HSN 300 microns export' dataset contains the EcoTaxa tsv exports which associate each object with these metadata (station name, sampling coordinates, sampling date and time, etc., the main metadata are found in the Classic Metadata ZooScan Tara Pacific HSN 330 microns.csv table) and describe it by numerous morphological features extracted from each individual object by ZooProcess. The csv table named 'Export EcoTaxa ZooScan read me.csv' defines the 160 metadata and data found in the EcoTaxa tsv export. The 'Descriptors ZooScan Tara Pacific HSN 330 microns.csv' table combined the data from which we calculated quantitative descriptors of the planktonic communities: abundance (ind.m-3), biovolume (mm3.m-3; as a proxy of biomass) calculated from the area, riddled area and ellipsoidal measurement of each object (see Vandromme et al., 2012 for the 3 calculations of biovolume), and Shannon diversity index. This was done for all taxonomic annotations and for several levels of grouping; living or non-living, plankton groups and trophic association. The individual biovolumes of organisms were arranged in Normalised Biomass Size Spectra (NBSS) as described by Platt (1978), with size expressed as Equivalent Spherical Diameter (ESD, µm). NBSS calculations were made for all taxonomic annotations and for the different levels of grouping. There are available for each station in the NBSS ZooScan Tara Pacific HSN 330 microns csv tables. 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.

Tallink ship Victoria I, with ferrybox system mounted onboard, is traveling (since end of 2023) regularly between Tallinn and Helsinki was appointed for summer of 2024 to Tallinn Mariehamn Stockholm line. During that period there were also some cruises to Visby (starting from Tallinn and via Helsinki).

Wave buoy data along the Bulgarian coast near Shcorpilovci village during 2021

Wave buoy data along the Bulgarian coast near Shcorpilovci village during 2023

Wave buoy data along the Bulgarian coast near Shcorpilovci village during 2022

Benthos samples taken as part of the EIA of the harbour constructions at Rotterdam

The Eurofleets+ IOPD research cruise took place from 28/06/2022 till 10/07/2022 in the Uummannaq region in West Greenland where a total of five fjords and the connecting shelf area were sampled. This data upload "Data from IOPD cruise Part 2 Water sample analysis and plankton identifications" contains: -Nutrient data of NH4, NO2, NO3, NOX, PO4 and DSi. -Chlorophyll a data. -Fatty acid profiles (in relative abundance) of the microzooplankton and mesozooplankton community. At certain stations the dominant species was picked out to have a separate fatty acid profile. -Phytoplankton identifications and counts by a FlowCam. - Zooplankton identifications of MultiNet samples by microscopy. A maximum of 10 specimen per species, per net, per sampling station were measured. - Zooplankton identifications of the Video Plankton Recorder data, accompanied with depth, temperature, salinity, turbidity, and fluorescence data from the CTD and FLNTU sensors mounted on the VPR. 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.

This dataset contains current data acquired between September 2016 and July 2017 using 2 TCM3 Ocean Bottom Tilt Current Meters installed next to the Tour Eiffel and Montségur hydrothermal vent sites. The TCM-3 Ocean Bottom Tilt Current Meter from Lowell Instruments LLC (North Falmouth, MA, USA) measures current using the drag-tilt principle. The logger is buoyant and is anchored to the bottom via a short flexible tether. Drag from moving water tilts the logger in the direction of flow. The logger’s accelerometer and magnetometer channels are used to record the amount of tilt and direction of tilt (compass bearing). The array comprised 3 currentmeters, deployed near the Tour Eiffel, Montségur and White Castle hydrothermal vent sites (the instrument at White Castle did not recover data). The array is not connected to an energy node. The currentmeter's internal clocks are set to UTC time before deployment. Clock drift after recovery is not implemented in data but added as metadata in the file "Sites and Sensor metadata". 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.

MARLEY (Monitoring deep-seA coRaL EcosYstems) is a deep seafloor observing system dedicated to the monitoring of cold-water coral habitats. The system is deployed in the Lampaul canyon off Brittany, France since August 2021 and maintained each year during the ChEReef-Obs cruises. The study site is a coral garden dominated by Madrepora oculata, located on a sedimented platform at 780 m depth. MARLEY is equipped with a CTD SBE 37-SIP, an oxygen optode Aanderaa (4330 or 4831), an ADCP Teledyne RDI Workhorse 300kHz, a turbidity sensor Wetlabs ECO NTU (sensitivity: 0-1000 NTU), a sediment trap Technicap PPS 4/3 – 24 bottles and a camera module. The camera module, which can be moved from up to 30 m from the main station, is equipped with a camera AXIS Q1786, two flash lights and a fluorometer & scattering meter SEA-BIRD ECO FLNTU. All sensors are controlled and synchronised by the Communication and Storage Front-end - 2nd generation (COSTOF2), which is also managing data storage. Optical sensors are protected from fouling by electrochlorination (20 seconds, each 6 hours). The oxygen optode is calibrated each year prior to deployment. These datasets provide raw data from the oxygen optode Aandera 4831, the CTD Seabird SBE37, the Wetlabs ECO NTU and the SEAR-BIRD ECO FLNTU covering the period 28/08/2021 to 19/01/2022, with a frequency of 15 minutes. Data from Wetlabs ECO NTU include raw counts and Nephelometric Turbidity Unit (NTU) derived from manufacturer’s calibration with Scale Factor = 0.0611 and Dark Counts = 50. Data form SEABIRD ECO FLNTU include raw counts at 695 nm (Chlorophyll) and 700 nm (Turbidity). Chlorophyll concentration (µg/l) is derived from manufacturer’s calibration with Scale Factor = 0.0180 and Dark Counts = 48. Nephelometric Turbidity Unit (NTU) is derived from manufacturer’s calibration with Scale Factor = 0.0481 and Dark Counts = 50. 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 Green Edge project was designed to investigate the onset, life and fate of a phytoplankton spring bloom (PSB) in the Arctic Ocean. The lengthening of the ice-free period and the warming of seawater, amongst other factors, have induced major changes in arctic ocean biology over the last decades. Because the PSB is at the base of the Arctic Ocean food chain, it is crucial to understand how changes in the arctic environment will affect it. Green Edge was a large multidisciplinary collaborative project bringing researchers and technicians from 28 different institutions in seven countries, together aiming at understanding these changes and their impacts on the future. The fieldwork for the Green Edge project took place over two years (2015 and 2016) and was carried out from both an ice camp and a research vessel in the Baffin Bay, Canadian arctic. Here, we describe the data set obtained during the research cruise, which took place aboard the Canadian Coast Guard Ship (CCGS) Amundsen in spring 2016. 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.