SOMLIT-Sète time series (French Research Infrastructure ILICO): long-term core parameter monitoring of the water column in the continental shelf in front of Sète City, North-western Mediterranean Sea

The SOMLIT-Sète station is a part of the French monitoring network SOMLIT (Service d’Observation en Milieu Littoral,, accredited by the French Centre National de la Recherche Scientifique (CNRS) as a National Observatory System (SNO). The main scientific objective of the observations at the SOMLIT-Sète station is to assess the long-term impact of climate change and human activities on the coastal Northwestern Mediterranean ecosystem, the impact of potential mid- and long-term changes in continental inputs, as well as changes in the productivity of the Gulf of Lion coastal zone. The SOMLIT-Sète station (latitude 43.3267N, longitude 3.66167E) is located in the dilution zone of a large river, the Rhône, but also small coastal rivers (Vène, Aude, Herault), especially those of the Thau lagoon basin. The SOMLIT-Sète Station is monitored from the Station Méditerranéenne de l’Environnement Littoral (SMEL) of the University of Montpellier in Sète by the staff of the OSU OREME, and the Research Unities of MARBEC ( and GéoSciences ( The SOMLIT-Sète station, located on a water-column depth of 30 m, is sampled at the water surface in a bi-monthly frequency. The SOMLIT-Sète station is implemented near an instrumented Cardinal Buoy integrating on the same site two other monitoring systems called SNO COAST-HF (Coastal ocean observing system - High Frequency), and SNO PHYTOBS (Phytoplankton observation network), entitling at site: COAST HF-Sète and PHYTOBS-Sète.

The SOMLIT-Sète is part of the long-term coastal observation stations of the French Research Infrastructure dedicated to coastal ocean observations (Infrastructure de Recherche Littorale et Côtières: ILICO,

Bi-monthly collected samples are analyzed for more than 20 core parameters such as temperature, salinity, dissolved oxygen, pH, ammonia, nitrates, nitrites, phosphates, silicates, suspended matter, particulate organic carbon, particulate organic nitrogen, chlorophyll-a, delta15N, delta13C; pico- and nano- plankton; and CTD-PAR-Chla fluorescence profile.

The SOMLIT network quality management system is in line with the ISO/IEC 17025:2017 standard: “General requirements for the competence of testing and calibration laboratories”. Further information on standard operating procedures for sample collection and data acquisition are available at: For more information on the quality flagging scheme:


Biological oceanography, Chemical oceanography, Cross-discipline, Environment, Fisheries and aquaculture, Physical oceanography


Marine Environmental time series, Hydrological and biogeochemical data, coastal system evolution, climate impact, Coastal ecology, Mediterranean Sea


43.3267N, 43.3267S, 3.66167E, 3.66167W


A SBE-19Plus-V2 profiler is used for CTD-PAR-Chla Fluorescence measurements. To guarantee best performances, the sensors return to the constructor every two years for calibration.


Alternative access to data

CTD 2015-2022 data
1 MoCSVQuality controlled data
Hydro 2015-2022 data
30 KoCSVQuality controlled data
Piconano 2015-2022 data
48 KoCSVQuality controlled data
How to cite
Mostajir Behzad, Mas Sébastien, Blayac Hadrien, Giannecchini Léa, Kempf Valentin, Voron Florian, Leredde Yann, Vidussi Francesca (2023). SOMLIT-Sète time series (French Research Infrastructure ILICO): long-term core parameter monitoring of the water column in the continental shelf in front of Sète City, North-western Mediterranean Sea. SEANOE.
In addition to properly cite this dataset, it would be appreciated that the following work(s) be cited too, when using this dataset in a publication :
Breton Elsa, Savoye Nicolas, Rimmelin-Maury Peggy, Sautour Benoit, Goberville Eric, Lheureux Arnaud, Cariou Thierry, Ferreira Sophie, Agogué Hélène, Alliouane Samir, Aubert Fabien, Aubin Sébastien, Berthebaud Eric, Blayac Hadrien, Blondel Lucie, Boulart Cedric, Bozec Yann, Bureau Sarah, Caillo Arnaud, Cauvin Arnaud, Cazes Jean-Baptiste, Chasselin Leo, Claquin Pascal, Conan Pascal, Cordier Marie-Ange, Costes Laurence, Crec’hriou Romain, Crispi Olivier, Crouvoisier Muriel, David Valérie, Del amo Yolanda, de Lary Hortense, Delebecq Gaspard, Devesa Jeremy, Domeau Aurélien, Durozier Maria, Emery Claire, Feunteun Eric, Fauchot Juliette, Gentilhomme Valérie, Geslin Sandrine, Giraud Mélanie, Grangeré Karine, Grégori Gerald, Grossteffan Emilie, Gueux Aurore, Guillaudeau Julien, Guillou Gael, Harrewyn Manon, Jolly Orianne, Jude-Lemeilleur Florence, Labatut Paul, Labourdette Nathalie, Lachaussée Nicolas, Lafont Michel, Lagadec Veronique, Lambert Christophe, Lamoureux Jezebel, Lanceleur Laurent, Lebreton Benoit, Lecuyer Eric, Lemeille David, Leredde Yann, Leroux Cédric, Leynaert Aude, L’helguen Stéphane, Liénart Camilla, Macé Eric, Maria Eric, Marie Barbara, Marie Dominique, Mas Sébastien, Mendes Fabrice, Mornet Line, Mostajir Behzad, Mousseau Laure, Nowaczyk Antoine, Nunige Sandra, Parra René, Paulin Thomas, Pecqueur David, Petit Franck, Pineau Philippe, Raimbault Patrick, Rigaut-Jalabert Fabienne, Salmeron Christophe, Salter Ian, Sauriau Pierre-Guy, Seuront Laurent, Sultan Emmanuelle, Valdès Rémi, Vantrepotte Vincent, Vidussi Francesca, Voron Florian, Vuillemin Renaud, Zudaire Laurent., Garcia Nicole (2023). Data quality control considerations in multivariate environmental monitoring: experience of the French coastal network SOMLIT. Frontiers In Marine Science. 10. -.,
Lheureux Arnaud, Savoye Nicolas, Del amo Yolanda, Goberville Eric, Bozec Yann, Breton Elsa, Conan Pascal, L'Helguen Stephane, Mousseau Laure, Raimbault Patrick, Rimelin-Maury Peggy, Seuront Laurent, Vuillemin Renaud, Caparros Jocelyne, Cariou Thierry, Cordier Marie-Ange, Corre Anne-Marie, Costes Laurence, Crispi Olivier, Crouvoisier Muriel, de Latour Hortense de Lary, Derriennic Herve, Devesa Jeremy, Durozier Maia, Ferreira Sophie, Garcia Nicole, Grossteffan Emilie, Gueux Aurore, Lafont Michel, Lagadec Veronique, Lecuyer Eric, Leroux Cedric, Mace Eric, Maria Eric, Mornet Line, Nowaczyk Antoine, Parra Michel, Petit Franck, David Valérie (2021). Bi-decadal variability in physico-biogeochemical characteristics of temperate coastal ecosystems: from large-scale to local drivers. Marine Ecology Progress Series. 660. 19-35.,

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