EMSO-Azores successfully upgraded

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Seamon East detail

Monday 12 September

The EMSO-Azores team is delighted to announce the successful upgrade of the observatory, achieved during the yearly three-week maintenance cruise aboard the R/V Atalante finishing today. The observing capacity of the marine infrastructure – operating on the Mid-Atlantic Ridge at the Lucky Strike hydrothermal vent field- 1700 m water depth – has been doubled thanks to the development of a new electronic core called COSTO2 based on Ethernet communication and implemented  on the 2 monitoring nodes. The new instruments deployed during this cruise are : BARS, a temperature and chlorinity sensors installed in a hot vent at 303°C, a 70 m long thermistor string gathering 100 sensors and installed around the Eiffel Tower active edifice, and Hydroctopus – a system of 4 hydrophones forming an array of 70 m aperture. The functioning of the system was verified in situ using a new WIFI link allowing communication at 50Mbits/sec between the ROV and the Sea monitoring station.

The following observation parameters are now available to the public in near real time:

– From the seabed: number, level and date of seisms detected since deployment, seabed pressure gauge, snapshot from an HDTV camera on a mussel assemblage, Iron concentration analysis spectrum description, Oxygen concentration from 2 sensors, turbidity sensor signal, output of a 100 thermistor string deployed on the Tour Eiffel active edifice, colonizer and vent water sampler system parameters, chlorinity sensor parameters as well as engineering parameters,

– From the sea surface: geodetic GPS data, weather station parameters (wind, pressure, temperature), buoy position and engineering parameters.

These parameters are accessible here (updated 4 times/day). In addition, the HD mussel assemblage video footages, the integral seismic data and those from an array of four hydrophones will be retrieved from the seabed stations next summer, as well as a number of temperature sensors distributed on the seabed.

The extension of the observing capacity is funded by the French National Research Agency « LuckyScales » project (grant agreement ANR-14-CE02-0008-01). It was made possible thanks to a substantial engineering effort on the subsea stations, including the design and use of a new sensor front-end named COSTOF2, able to serve more sensors and to handle increased data volumes and rates.

The new SEAMON East station prior to the deployment of its sensors. The ROV is connecting the WIFI link to check the functioning of all the sensors

The new SEAMON East station prior to the deployment of its sensors. The ROV is connecting the WIFI link to check the functioning of all the sensors

 The ROV is carrying the connector of the hydroctopus station, to be plugged to the SEAMON East station. Afterwards, the 4 hydrophones will be deployed.


The ROV is carrying the connector of the hydroctopus station, to be plugged to the SEAMON East station. Afterwards, the 4 hydrophones will be deployed.