Coastal-cabled observatory EMSO-Molène

(short name)

Reseau Eulerien

(short name)

Coastal-cabled observatory EMSO-Molène


Molène Island, France, Atlantic Ocean


48.401°N – 04.933°W

Bottom depth

18 m

Legal name of organisation

Institut Francais de recherche pour l'exploitation de la mer (IFREMER)




Nadine Lantéri

Ifremer REM/RDT/I2M
Centre de Brest – CS 10070

Tel: +33 (0)2 98 22 46 45

Email: Please login or register to view contact information. 

The seabed cabled observatory EMSO-Molène was deployed off shore 2 km north of Molène in the marine protected area “Iroise Marine Park”. MOLENE is an EMSO testing site at depth 18 meters, dedicated to sensors and equipment in-situ and long-term qualification. The instrumental module is a removable device that includes the electronic core of the observatory: the “Node” and the “Junction Box”. The Node inputs an optical signal and converts it into electrical. On the node output, the Junction Box relays instructions, collects data, protects the equipment in case of electrical malfunction and provides failure warnings. Remote control of the instruments and data recovery. Network throughput: 1 Gbit/s between the sensors and the relay station, restricted between the island and Brest. A land-based server transmits data to the subscriber. Data time stamping: GPS clock, NTP/PTP Network, Network Attached Storage. Available for the instruments: 6 identical inputs (Subconn MCBH12M, Micro Bulkhead, 12 contacts), voltage: 15V and 48V, power supplied for the 6 connections: 75 W under 15V and 75W under 48V. Seawater physico-chemical measurements are performed by the platforms on the site (high frequency sampling).

Web site address:

Instrument Measured Parameter(s) Elevation / Depth Sampling Frequency of data recovery
AADI O2 optode 4330 Dissolved Oxygen 18 m 5 minutes Real Time
WETlab FLNTUrtd Fluorescence and Turbidity 18 m 5 minutes Real Time
Seabird SBE37SIP CTD 18 m 5 minutes Real Time
ADCP Temperature, pressure, current. Wave height, on request 18 m 6 minutes Every day
Video camera Video 18 m Video in running natural light permissing. A 2 minute clip is recorded every hour Video streaming available in low definition. HD clips are recovered during maintenance

The sampling rates, the transmission frequency and the duration of the video clips can be set and modified during deployment to fit user requirement. The maintenance is scheduled 3 to 4 times a year but additional operations can be added on request.

  • Remote: the measuring system is implemented by the operator of the installation and the presence of the user group is not required,
  • Partially remote: the presence of the user group is required at some stage e.g. installing and un-installing user’s equipment.

Unit of access (UA): month.

Quantity of access available to JERICO NEXT users: 3 UA=3 months.

Users can apply for a minimum access duration of 1 months (1 UA), for intermediate access duration of 2 months (2 UA) or for the maximum duration of 3 months (3 UA).

Access duration corresponds to the period of installing, operating and un-installing a measuring system by the users (partially remote access) or in his/her behalf by the access provider (remote access).

MOLENE operates all year long and sensors are swapped from twice to four times a year. Technical staff and divers perform marine operations. At the moment, the observatory is equipped with a camera, an ADCP, a Seabird SBE37SIP, WETlab FLNTUrtd and an AADI O2 Optode 4330.

Technical assistance to adapt equipment to the platform and its deployment at sea will be provided by the Ifremer scientific and technical staff. Indeed, Ifremer is used to operate equipment on many fixed platforms like Marel coastal network and seabed observatories like Ocean Network Canada (Neptune) and Emso-Azores (MOMARsat cruises). As well, technical laboratories are available for partners to test their equipment interfaces and drivers before deployment at sea and to perform final metrology check in a high-level marine metrology calibration lab with National Metrology accreditation (see METLAB in Chapter 2). Marine sensor biofouling expertise can be provided to the users.

To be verified with the facility provider