DEAFS – Deep-sea Autonomous and automated Fluid sampler data from the EMSO-Azores observatory, 2019

High temperature hydrothermal fluids are collected by the Deep-sea Autonomous and automated Fluid Sampler. The instrument is deployed at the footstep of the Montsegur edifice. The site, named Montserrat, expels hydrothermal fluid at 275°C which were collected beforehand by gas-tight fluid sampler manipulated and triggered by the hydraulic arm of the submarine vehicle (HOV Nautile).

Several chemical analyses are performed aboard the research vessel: such as salinity and d20/20 by refractometer, pH and Eh by electrode (pH standard 4.01 and 7; Eh standard solution at -220mV), H2S and total S concentrations measured by electrode (AquaMS, amperometric method) at measured pH value.

Unfortunately, the DEAFS  felt down shortly after its set-up. Only one fluid has been collected.

Regional Node: EMSO-Azores, Lucky Strike Hydrothermal Field

Vent field : Montserrat at the base of Montsegur

Latitude : 37º17.2744’N

Longitude : 32º16.5461’W

1699 m depth


Chemical oceanography, Environment


Mid-Atlantic Ridge, EMSO-Açores, hydrothermal fluids, Lucky Strike, geochemistry, MOMARSAT 2019


37.287907N, 37.287907S, -32.275768E, -32.275768W



  • high temperature hydrothermal fluid sampler


  • Regional node: Emso-Azores
  • Site: Montserrat at Lucky Strike Hydrothermal Field
  • Node: /
  • Coordinates: N37º17.2744 and W32º16.5461’
  • Depth: 1699m


  • Cruise: SARRADIN Pierre-Marie, LEGRAND Julien (2019) MOMARSAT2019 cruise, RV Pourquoi pas ?,
  • Dive: HOV Nautile, 1947/21/9 on June the 2st 2019


  • Cruise: SARRADIN Pierre-Marie, LEGRAND Julien (2020) MOMARSAT2020 cruise, RV Pourquoi pas ?,
  • Dive: ROV 755 – 3 on September the 16th 2020

Operating parameters

  • Sampling period: every 25th of the month over a year time period
  • Anti-fouling device : N/A

Sensor metadata

  • Type: N/A
  • Model:  N/A
  • Firmware: N/A

Sensor configuration

Sequenced fluid sampling programming 

Test and calibration

  • 12 Titanium bottles certified TOP Industrie S.A.S; Hydro test pressure @ 572bar; Working pressure : 400bar

Certification: N° 9615N, 9616N, 9617N, 9618N, 9619N, 9620N, 9621N, 9622N, 9623N, 9624N, 9625N, 9626N.

  • Certification test of cylinder : working pressure : 412 bar; Ifremer PDG/IMN/SM/2IDM/17-0095

Data management

  • Real time data transmission: No


735 octetsCSVRaw data
How to cite
Chavagnac Valérie, Castillo Alain, Destrigneville Christine (2023). DEAFS – Deep-sea Autonomous and automated Fluid sampler data from the EMSO-Azores observatory, 2019. SEANOE.

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