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.