Environmental Observatory of the Littoral (EOL) biogeochemical data from the Northwestern Mediterranean sea.

Date 2022-12-19
Temporal extent 2013-09-13 -2022-10-16
Author(s) Alliouane SamirORCID1, Grisoni Jean-Michel1, Gazeau FrédéricORCID1
Affiliation(s) 1 : Sorbonne Université, CNRS, Laboratoire d'Océanographie de Villefranche, LOV, F-06230 Villefranche-sur-Mer, France
DOI 10.17882/91965
Publisher SEANOE
Keyword(s) Mooring, Surface, Northwestern Mediterranean Sea, Monitoring, Oceanography, Salinity, Temperature, Oxygen

The EOL (Environmental Observation of the Littoral) buoy is operated since 2013 in the bay of Villefranche-sur-Mer (France, 43°40'54.0"N 7°19'10.8"E). This buoy (3.6 m wide, 4 tonnes), equipped with solar panels, allows performing, in an autonomous way, measurements of physico-chemical parameters on a mooring mode (2.5 m depth). This buoy was developed as part of a partnership between the Observatoire Océanologique de Villefranche (OOV; now Institut de la Mer de Villefranche, IMEV) and the company Mobilis. Data transmission is performed on a daily basis and data stored on a server on land (http://www.obs-vlfr.fr/data/view/eol/surface/). The buoy is currently involved in the COAST-HF network as part of the Coastal Ocean and Nearshore Observation French Research Infrastructure (ILICO). In particular, the buoy is equipped with a Sea-Bird SBE SMP-ODO deployed at the surface (2.5 m). An extra CTD is available in order to rotate during calibration at the manufacturer. Underwater cleaning of the sensors is performed on a monthly basis. In addition, a proper cleaning in the lab is performed three times a year. The site where the buoy is deployed is visited (100 m away from the buoy) on a weekly basis as part of the SOMLIT network. In the framework of SOMLIT, casts are performed with a CTD properly cleaned after each use and calibrated on a yearly basis. Salinity data from the buoy are corrected based on these extra-measurements. Furthermore, discrete sampling is performed for the measurements of oxygen (Winkler method) in order to inter-calibrate the respective sensors on the buoy.

Licence CC-BY-NC
Acknowledgements Laure Mousseau, Carla Larvor, Franck Petit, Cyril Debost, Maïa Durozier, Aurélien Domeau, Hortense Delary, Ornella Passafiume, Didier Robin, Guillaume De Liège, David Luquet
Sensor metadata

Temperature, oxygen and salinity are measured by a CTD Sea-bird (SBE37 SMP-ODO). Time is in UTC.

File Size Format Processing Access
EOL data : temperature, salinity and oxygen 2 MB CSV Processed data Open access
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How to cite 

Alliouane Samir, Grisoni Jean-Michel, Gazeau Frédéric (2022). Environmental Observatory of the Littoral (EOL) biogeochemical data from the Northwestern Mediterranean sea. SEANOE. https://doi.org/10.17882/91965