cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.17882/79590
title: Current distribution of Zostera seagrass meadows along the SW coast of the Black Sea, Bulgaria

description: The current distribution of Zostera spp. seagrass meadows along the Bulgarian Black Sea coast was studied using a combination of historical and recent observations of the habitat along the studied coastline, confirmed by georeferenced drop camera observations, scuba diving sampling and georeferenced scuba diving photo and video transects. Once the presence of seagrass beds in a certain location was confirmed, the most recent and clearly visible satellite images available in the Google Earth Pro libraries were used for creating polygons of the actual outline and distribution of the studied Zostera meadows. In certain locations ( e.g. Sozopol Bay), these methods were combined with high resolution side scan mosaics, where the borders of the seagrass meadows were outlined based on the clearly visible differences in texture of vegetated and non-vegetated sediments. The actual ground truthing and mapping methods are marked in the attributive table of the database under the column ‘map_method’. The date of the in-situ observation is noted in the column ‘dive_date’, and the date of the satellite image/side scan used for the mapping is noted in the ‘Sat_date’ column. In total over the period of the whole study (2011-2020) a total of 1859 video and photo observations were filmed and analyzed, as well as 129 samples were collected and processed. The total area of the habitat type classified in the EUNIS habitat types list ( 2019) as ‘MB548- Black sea seagrass meadows on lower infralittoral sands’ in the study area is 916.9 ha, of which only 17.9 ha are in man-made sheltered environments ( harbours). We have not mapped some some small seagrass meadows in Varna Bay and in the vicinity of the towns of Kavarna and Balchik, which may further increase the overall area of this habitat along the Bulgarian Black Sea coast. Mapping done in the framework of the following research projects: ''Enlargement of the Natura 2000 ecological network within the Bulgarian Black Sea sector".Contract 7976/04.04.2011 between MoEW and IO-BAS" ; FP7 Perseus ; FP7 Coconet; BalkanMed Reconnect; FEMA-MARE; MSFD National monitoring program 2017;
DOI: 10.17882/79574
title: GPS drifter data from near-field river plume in Doubtful Sound, New Zealand

description: Here we provide GPS drifter data from the near-field region, Deep Cove, in Doubtful Sound, New Zealand. A controlled freshwater discharge is carried from alpine lakes (Manapouri and Te Anau) through the Manapouri hydroelectric power station and, via a constructed channel, into the head of Doubtful Sound, located on the southwest coast of New Zealand (45.3 S, 167 E). The freshwater tailrace is discharged into the head of the inner fjord, Deep Cove. Deep Cove is 3.6 km long and, flanked by steep topography, has a maximum depth of 126m that occurs within 50m of the shoreline. A 2-week field campaign was conducted in March 2016. Lagrangian measurements of near-surface currents were made during six GPS drifter experiments. The plume discharge rate and wind speeds for each experiment are detailed below, and wind direction was consistently up-fjord due to the surrounding steep topography. The drifters each had a cylindrical drogue of height 0.5 m and diameter 0.2 m, and were ballasted to measure the upper 0.5 m of the water column by a small spherical float. Wind slippage was minimal as the float had little exposure to wind above the surface water level. Each drifter was equipped with a GPS receiver (Columbia V-900 GPS data logger) which recorded every 1 second. The GPS devices have a position accuracy up to 1.5 m, depending on satellite coverage. The drifters were released approximately 10 m apart across the width of the tailrace discharge point and were recovered after $\sim 1$ hour. A total of 8 drifters were deployed in the first two experiments then, due to the loss of a GPS receiver, 7 drifters were deployed and retrieved in the subsequent four experiments
DOI: 10.17882/79396
title: Raw data from a wide-angle seismic survey offshore French Guyana and Surinam

description: This archive includes wide-angle seismic data from profiles 1, 2, 3 and 2 of the MARGATS cruise offshore French Guyana and Surinam including navigation files. The objective is more precisely to characterize the crustal structure and evolution of marginal plateaux, sub-marine reliefs that are associated to 30 % of the transform margins in the world. These reliefs are systematically observed at the junction of different ages in relay zones between divergent and transform segments. Their building remains enigmatic although they represent reliefs established in geodynamical nubs that are keys ton understand the localisation of transform margins. This project MARGATS intend to image the deep structure of the marginal plateau (wide angle seismic and multichannel seismic MCS). The experimental site proposed is the Demerara plateau offshore French Guyana and Surinam and located at the junction between Central Atlantic locally opened in a divergent mode and Equatorial Atlantic opened mainly in transform mode in the area. Hence, this plateau has recorded at its different borders the divergent opening of the central Atlantic and the tranform opening of the Equatorial Atlantic. It may be this situation itself that leads to the formation of the plateau, but it requires to precisely constraint its deep internal structure. Finally the Demerara plateau is one of the more studied with petroleum seismic data and high resolution seismic data. It is then one of the ideal place to conduct a high resolution wide-angle deep seismic survey.
DOI: 10.17882/79349
title: Memorial University Ocean Glider Deployments : 2005 – Present

description: Memorial University has over the past 15 years been involved in various ocean glider activities with deployments focused primarily on the Newfoundland Shelf and the Labrador Sea. For example, there are four deployments with glider data in the Labrador Sea. Partnerships with Fisheries and Oceans Canada and Ocean Gliders Canada have also resulted in deployments of Memorial's gliders in the Pacific. The data contain 14’663 mission kms, 620 deployment days and 25’108 individual glider profiles. L1 NETCDF files for every deployment archived on the Memorial University’s Glider Data server are made available publicly for scientific research. Deployments vary in duration and region. All files were processed with the SOCIB glider toolbox (Troupin et al., 2015), modified by Nicolai von Oppeln-Bronikowski, 2019 for MUN glider deployments. Metadata: File creator(s), contact info, institution, applicable funding, responsible researcher(s), deployment region, deployment start, deployment end, longitude min, longitude max, latitude min, latitude max, glider type, glider configuration if known, sensors, sensor serial numbers, science data QC. Glider Data: - Minimum Data: Time, Depth, Position, Depth-Averaged Current, CTD. - Most Deployments: Oxy_umolL, Oxy_Calphase_DEG, Oxy_sat - Some Deployments: pCO2_uatm, pCO2_Calphase_DEG, pCO2_Dphase
DOI: 10.17882/79305
title: Chemical contamination in Mytilus galloprovincialis with metals, PAHs, PCBs and organochlorine pesticides

description: The MYTIAD project focused on the assessment of chemical contamination (metals, PAHs, PCBs and organochlorine pesticides) in the Adriatic coastal waters by active mussel watching. Its purpose was harmonising and standardising strategies and methodologies used to assess the contamination status of the Adriatic Sea, in the framework of the WFD, the MSFD and UNEP/MAP Integrated Monitoring and Assessment Programme. Data on metals pointed out some hotspots along the eastern and western Adriatic Sea coasts, with the highest values of total PAH concentration detected in Split, Trieste, and Taranto (Ionian Sea). PCB and endrin contamination was higher in the Adriatic Sea than in the western Mediterranean Sea. This is the first comprehensive overview of contamination in the Adriatic Sea with critical comparisons of related studies over the Mediterranean Sea. It provides a useful harmonised dataset to support a coordinated definition of baselines, targets and thresholds, and further management of chemical contamination.
DOI: 10.17882/79142
title: EM2040CD Multibeam Echo Sounder water-column data (300 KHz) acquired in the nearby of an offshore gas platform in Central Adriatic Sea

description: The present data is shared in order to reproduce a study aimed to automatically extract and identify targets (gas seeps, fish schools and noise) from the water column using machine learning techniques. The dataset is composed of two surveys conducted over a square area of 1X1 Km wide centered on a four-leg gas platform located in the Central Adriatic Sea at a distance of 65 km from Ancona (Italy). Surveys were conducted in calm sea conditions the 11-12-2018 and 24-07-2019. The instrument used is a hull-mounted Multi-Beam Echosounder Simrad Knogsberg EM2040CD, acquisition frequency is 300 kHz, the opening angles were 80°/10° (port, starboard) for one head and 10°/80° (port, starboard) for the other head maintaining 10° of overlap between the two swaths. The seabed depth is about 85 meters, the survey was conducted following 10 parallel lines N-S oriented with a distance of 150 meters one from the other in order to assure at least a superposition of 50% between one row and the other. A Trimble SPS855 GNSS Receiver with Omnistar HP/XP/VBS subscription was used for ship positioning, while a Kongsberg motion sensor MRU 5 and an Anschutz Compass Standard 20 Compact Type 110-222 NG001 gyro corrected pitch, roll, heave and yaw movements. Sound velocity profiles were systematically collected with an AML Oceanographic Smart SV&P sensor before the surveys were started (and repeated when needed), while a Valeport MiniSVS probe was mounted close to the transducers to continuously measure the sound velocity for the beamforming.
DOI: 10.17882/79101
title: Mercury concentrations and isotopic data in hake (Merluccius merluccius), red mullet (Mullus surmuletus) and common sole (solea solea)

description: This dataset gather isotopic ratios (carbon and nitrogen) and concentrations of mercury species (methyl and inorganic mercury) measured in several tissues (muscle, liver and gonad) for three commonly consumed fish species from the south Bay of Biscay (France) in 2017 and 2018.
DOI: 10.17882/79028
title: Torpedo boat wreck (Mediterranean, 43.124N;6.523E): Imagery and 3D model

description: Abstract Torpedo boat wreck off-the southern French Mediterranean coast (43.124°N;6.523°E), at a water depth of ~476 m. This battle ship sank in 1903 (https://www.postenavalemilitaire.com/t11913-torpilleur-059-1881-1903) and the wreck is is ~20 m long and 3 m wide, raising ~2 m above the surrounding seafloor. This shipwreck was surveyed using the HROV Arianne in 2016, deployed from N/O L’Europe, and equipped with a vertical electronic still camera. Two datasets are provided. First, the survey imagery, that consists of 442 images (jpeg format) and an associated navigation file in dim2 format (torpdo_boat_imagery). Second, a 3D textured model of the site (obj format), together with the a kml file for georeferencing, and a geotiff orthomosaic (torpedo_boat_model). This dataset is one of several sets released with a paper by Arnaubec et al. (submitted to Computer and Geosciences) presenting the Matisse image processing software, and the 3DMetrics Visualization and analysis software (ref Github to come). Arnaubec, A., J. Escartín, J. Opderbecke, M. Matabos, N. Gracias, submitted, Underwater 3D terrain reconstruction from video or still imagery: Processing and exploitation software (MATISSE \& 3DMETRICS), Computers and Geosciences
DOI: 10.17882/79024
title: Seafloor litter field off the French Mediterranean coast (43.078°N;6.458°E): 3D scene and imagery

description: Litter site at the seafloor, off the southern French Mediterranean coast (43.078°N;6.458°E), at a water depth of ~600 m This litter field was surveyed using the HROV Arianne in 2017, deployed from N/O L’Europe, and equipped with a vertical electronic still camera. Two datasets are provided. First, the survey imagery, under a folder named carthorov_dump, that consists of 303 images (jpeg format) and an associated navigation file in dim2 format. Second, 2 folders with 3D textured models of the site (obj format), each with a kml file for georeferencing, and an geotiff orthomosaic. A first model is the result of processing imagery without data correction (folder WithoutAnyCorrection). A second model is processed with image colour correction (folder WithColorAndIlluminationCorrection). This dataset is one of several released with a paper by Arnaubec et al. (submitted March 2021, Computer and Geosciences) presenting the Matisse image processing software and the 3DMetrics Visualization and analysis software and released as open source (ref Github to come). Ref: Arnaubec, A., J. Escartín, J. Opderbecke, M. Matabos, N. Gracias, submitted, Underwater 3D terrain reconstruction from video or still imagery: Processing and exploitation software (MATISSE \& 3DMETRICS), in prep., Computers and Geosciences.
DOI: 10.17882/78928
title: EMSO / MAREGAMI Marmara bottom pressure and current records

description: EMSO is a European network of seabed and fixed-point water column observatories whose scientific objective is to acquire long time series in the seas around Europe for the study of environmental processes related to interactions between geosphere, biosphere and hydrosphere. MAREGAMI project (MARine Earthquake Gap Assessment and Monitoring for Istanbul) is a bilateral Turkish-French collaborative project coordinated by IFREMER and Istanbul Technical University and funded by ANR and TÜBITAK. The goal of MAREGAMI was the development of new methods and monitoring strategies to assess earthquake and tsunami risks related to offshore faults, with tasks: (1) Marine geodesy: acquisition and processing of geodetic submarine data, (2) Hydrodynamics and specific depositional processes: water column data acquisition and hydrodynamic modeling, (3) Improving earthquake relocation with ocean bottom instruments, (4) Designing an optimal and sustainable network of submarine sensors. Data distributed here were acquired for MAREGAMI Task 2. These consist of time series acquired during 4 deployments on the sealfoor perfomed between January 2018 and November 2020 of an instrumented frame holding a RBR bottom pressure recorder (BPR) and a Seaguard recording current meter (RCM) equipped with additional sensors (conductivity, oxygen, tide pressure end temperature). The acquisition and distribution of marine data time series in the Sea of Marmara is funded by EMSO-France Research Infrastructure, EMSO-Link, and MAREGAMI projet. DT-INSU provided operational support and instrumentation.
DOI: 10.17882/78902
title: Comparison of three different turbine designs in unsteady flow conditions

description: The purpose of the experiments is to compare how three different turbine designs perform in unsteady flow conditions: in turbulence and in surface waves, generated in the wave and current flume tank of Ifremer at Boulogne-sur-mer. An additional objective is to characterise the unsteady inflow conditions, and correlate them to the measured turbine loads. The turbine performance is measured in steady and unsteady flow, through torque and thrust transducers. The inflow is characterised through 2-components and 3-components LDV systems and PIV measurements. The two LDV systems are used to take simultaneous 2-point measurements of the turbulent flow, at several locations in the turbine plane. This is done in an empty tank, i.e. when the turbine is not deployed. The purpose is to measure the spatial correlation of turbulent gusts in the turbine plane, by measuring at two locations simultaneously. When the turbine is deployed, one velocity measurement point (using the 2-components LDV) is always acquired upstream of the turbine hub and in synchronization with the turbine parameters. Time-resolved PIV recording at 15 Hz is used to measure the flow adjacent to the turbine when operating in turbulence. The PIV plane includes the upper half of the turbine diameter, i.e. the edge of the turbine nose is just visible on the bottom right side of the PIV plane. These PIV measurements are acquired in synchronization with the turbine parameters. These LDV and PIV measurements enable the correlation and the coherence between the inflow characteristics and the turbine parameters to be processed.
DOI: 10.17882/78736
title: The acceleration data before and after the collision of drifted test body with a concrete wall due to a tsunami wave

description: Although most fatalities in tsunami-related disasters are conjectured to be a result of drowning, injury risk owing to collision with other floating debris or fixed buildings has not been studied sufficiently. In this study, the impact force corresponding to the collision of a concrete block and drifting test body in a tsunami wave was experimentally investigated. The experiments were conducted using the Large Hydro-Geo Flume in the Port and Airport Research Institute, Yokosuka, Japan. The flume has length, width, and depth of 184 m, 3.5 m, and 12 m, respectively, with a piston-type wave-generator. In the experiment, a soft polyvinyl chloride (PVC) dummy and a PVC pipe with lids filled with water were employed as test bodies. Two acceleration sensors were attached to the head and ankle of the KM, and one sensor of the same type was attached at the top of the PVC pipe to investigate the impact of collisions.
DOI: 10.17882/78593
title: GEODESEA-2019 An experiment of seafloor geodesy in the Bay of Brest

description: In the framework of the ERC FOCUS project, the Geosciences Ocean Laboratory (LGO) organized, from July 22 to 26, 2019, an experiment of seafloor geodesy in the Bay of Brest, entitled Geodesea-2019. The aim was to test acoustic beacons acquired for the FOCUS project and to test experimental protocols for seafloor positioning. The experiment was carried out from the Albert Lucas research station-vessel. The experiment was conducted in collaboration with the Laboratoire Environnement et Sociétés (LIENSs) from la Rochelle and the iXBlue company, in Brest. Relative acoustic ranging was carried out during four days, each beacon ranging the other ones at a regular time interval, while acquiring auxiliary data (temperature, pressure, sound-speed) to be able to convert travel-times into distances. Absolute positioning of the beacons on the seafloor was also carried out using a small Unmanned Surface Vehicle (USV) on which a compact GNSS/Acoustic system was mounted, combining an Ultra Short Baseline (USBL), an inertial system (INS) and a GNSS receiver.
DOI: 10.17882/78577
title: Rapid reductions in North Atlantic Deep Water during the peak of the last interglacial period

description: Deep ocean circulation has been considered relatively stable during interglacial periods, yet little is known about its behavior on submillennial time scales. Using a subcentennially resolved epibenthic foraminiferal d13C record, we show that the influence of North Atlantic Deep Water (NADW) was strong at the onset of the last interglacial period and was then interrupted by several prominent centennial-scale reductions. These NADW transients occurred during periods of increased ice rafting and southward expansions of polar water influence, suggesting that a buoyancy threshold for convective instability was triggered by freshwater and circum-Arctic cryosphere changes. The deep Atlantic chemical changes were similar in magnitude to those associated with glaciations, implying that the canonical view of a relatively stable interglacial circulation may not hold for conditions warmer and fresher than at present.
DOI: 10.17882/78545
title: EM304 multibeam data - Blackmud canyon

description: This dataset presents EM304 multibeam echosounder acoustic data, collected over BlackMud Canyon on the continental shelf edge in Northern Bay of Biscay. Data files include bathymetry, seabottom backscatter, and water column acoustic data in echosounder kmall format, recorded onboard R/V Thalassa during EM304 Sea Acceptance Test on 08/09/2018 and 09/09/2018. Bathymetry ranges from 200m to 4200m depth. Kmall files can be displayed and processed using e.g. the GLOBE freeware provided by Ifremer at: https://www.flotteoceanographique.fr/Nos-moyens/Logiciels-de-la-flotte/Analyse-et-traitement-de-l-information/GLOBE.
DOI: 10.17882/77813
title: Habitat maps of the Protected Area of northern Karpathos and Saria (GR4210003) (December 2020)

description: The targeted area in Greece is the Protected Area of northern Karpathos and Saria (GR4210003). According to the standard form of the SCI, its marine part has an area of 5181.74 ha, i.e. about 45% of its total area, which includes habitat 1110, habitat 1120, habitat 1170 and habitat A5.531.Bottom substrates were surveyed with a DeepVision (DE3468D) portable side scan sonar trawled on the “Saria” vessel with a high precision GPS system. The survey vessel performed a number of transects in the study sub-areas, in most cases parallel to the shoreline and with an overlap of the scanned area of the bottom between two adjacent transect lines. All data were continuously recorded onboard the survey vessel on a computer with the appropriate software systems installed. Additionally, the BlueRobotics, BLUE ROV2 (ver. heavy duty) underwater drone was used for ground truthing of the different habitat types. The sonograms of the scanned area were later used for the creation of substrate type maps of the area. Data analysis was performed with the software products DeepView Pro for the side scan sonar data, and QGIS3.12 for the creation of substrate and overview maps. Data exported in KML format by DeepView and transformed in shape files in QGIS. Polygons of the same habitat were merged so each feature within the shapefile is assigned to each habitat. To ensure that the data will display properly the shapefiles were cleaned by removing any geometry or topology errors. All habitats visualized on MedOBIS viewer (https://portal.lifewatchgreece.eu/).
DOI: 10.17882/77683
title: Soft bottom and hard bottom habitats within the BB0000146 'Gradina-Zlatna ribka' SCI area.

description: Soft bottom and hard bottom habitats within the BB0000146 'Gradina-Zlatna ribka' SCI area. Mapped and created by IBER-BAS within the BalkanMed RECONNECT project ( 2017-2020)
DOI: 10.17882/77657
title: Interglacial instability of North Atlantic Deep Water ventilation

description: Disrupting North Atlantic Deep Water (NADW) ventilation is a key concern in climate projections. We use (sub)centennially resolved bottom water d13C records that span the interglacials of the last 0.5 million years to assess the frequency of and the climatic backgrounds capable of triggering large NADW reductions. Episodes of reduced NADW in the deep Atlantic, similar in magnitude to glacial events, have been relatively common and occasionally long-lasting features of interglacials. NADW reductions were triggered across the range of recent interglacial climate backgrounds, which demonstrates that catastrophic freshwater outburst floods were not a prerequisite for large perturbations. Our results argue that large NADW disruptions are more easily achieved than previously appreciated and that they occurred in past climate conditions similar to those we may soon face.