PIAF project: CTD data in Corsica, NW Mediterranean, may 2023.

This dataset contains the CTD data were collected during the PIAF project (Fish inventory using environmental DNA), between 30/04/2023 and 11/05/2023, around Corsica, western Mediterranean, jointly by the Andromède océanologie [https://www.andromede-ocean.com/] (France) and MARBEC MARine Biodiversity, Exploitation and Conservation [http://www.umr-marbec.fr/en/?lang=en] (France) teams. The CTD data were obtained using RBR concerto3 autonomous logger from Victoria IV trimaran belonging to Scopra, France and chartered by the University of Montpellier. 79 transects (16 were 2.5-km long and 63 were 5-km long) were performed along the -40m isobath (34,6 m in mean, 5 m above the seabed in mean), i.e. the lower limit of the Posidonia meadow, east, south and west Corsica between latitude 41.2-43°N and longitude 8.4-9.5°E. The sensors measured and recorded conductivity (mS/cm), temperature (°C), pressure (dBar), dissolved O2 concentration (µmol/L) and turbidity (NTU). Other parameters were derived from the previous measurements: sea pressure (dbar) removing atmospheric pressure, depth (m) simplifying and using density parameter, salinity (PSU) or Practical Salinity Scale (PSS-78), speed of sound (m/s) based on UNESCO algorithm, specific conductivity (µS/cm) and dissolved O2 saturation (%). All parameters were measured or calculated at depths ranging from -5 m to -49 m (Table 1). Recordings were made every 0.5 seconds (2 Hz frequency). The accuracy, specified by the manufacturer, were ±0.003mS/cm for conductivity, ±0.002°C for temperature, ±0,1 dbar for pressure (Depth), a maximum of ±2µmol/L or ±1.5% for dissolved O2 concentration and saturation.  RBR Concerto3 was factory calibrated before. The downloadable files are a csv of CTD probe data, a geopackage with the spatialized transects and a folder with a pdf showing the evolution of all the variables, accompanied by a text explaining the methodology and the meteorological parameters that influenced the measurements.   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.