Autonomous temperature probes data from the EMSO-Azores observatory, 2021-2022

Date 2022-11
Temporal extent 2021-05-30 -2021-06-22
Author(s) Cannat MathildeORCID1, Fontaine Fabrice1, Mahato Souradeep1, Sarradin Pierre-MarieORCID2, Matabos MarjolaineORCID2, Sarrazin JozeeORCID2
Affiliation(s) 1 : CNRS, IPGP, France
2 : IFREMER Institut Carnot EDROME, France
DOI 10.17882/91234
Publisher SEANOE
Keyword(s) Mid-Atlantic Ridge, EMSO-Azores, Hydrothermal Vents, Lucky Strike, Eiffel Tower, Capelinhos, Cimendef, Cypres, Montsegur, Sintra, South Crystal, White Castle, Y3, WHOI, NKE, iButton, LTGrad, Temperature, Time-series, MoMAR, MoMARSAT2021, MoMARSAT 2022

This dataset contains temperature data acquired between june 2021 and june 2022 with an array of 32 autonomous temperature probes installed in smoker orifices, cracks or patches of diffuse hydrothermal venting. We used 7 types of probes (HTW, HTWN, HTNKE, LTNKE, LTW, LTI and LTGrad). Probes locations, acquisition parameters and clock drift values (UTC-timeprobe) are listed in the metadata file.

Data are provided for each deployed instrument as one or two text files, uncorrected for clock drift: temperature data.

Licence CC-BY
Utilisation EMSO data are published without any warranty, express or implied. The user assumes all risk arising from his/her use of EMSO data. EMSO data are intended to be research-quality and include estimates of data quality and accuracy, but it is possible that these estimates or the data themselves contain errors. It is the sole responsibility of the user to assess if the data are appropriate for his/her use, and to interpret the data, data quality, and data accuracy accordingly. EMSO welcomes users to ask questions and report problems to the contact addresses listed in the data files or on the EMSO web page.
Sensor metadata


  • vent fluid temperature (°C)


  • Regional node: Emso-Azores
  • Site: Lucky Strike hydrothermal field
  • coordinates: see EMSOAzores_auton_T_probes_2020_2021.docx


Cruise: MATABOS, Marjolaine and SARRAZIN Jozée, MOMARSAT2021 cruise, Atalante,


Cruise: Cruise: SARRADIN Pierre-Marie and MATABOS, Marjolaine, MOMARSAT2022 cruise, Pourquoi Pas?, 10.17600/18001914

Operating parameters

  • Temperatures are recorded at frequencies between 1/30 s and 1/60 minutes.

Sensor metadata

High-temperature WHOI probes (HTW) contain of 2 J-type thermistors in their rod tip connected to 2 temperature data-loggers (named A & B), 2 data recordings are thus available for each probe. HTW probes record temperatures up to 415°C with an accuracy of ± 1.1°C, a resolution of 0.25°C at 375°C.

New high-temperature WHOI probes (HTWN) contain 1 temperature data-logger and 1 attitude logger to measure absolute orientation (tilt) and acceleration. The thermocouple in their rod tip can be J or T-Type. We mostly use J-Type thermocouples. These record temperatures up to 450°C, with an accuracy of ± 0.6°C, a resolution of 0,03°C.

High-temperature NKE probes (HTNKE) record temperatures up to 450°C, with an accuracy of ±0.5°C, and a resolution of 0.1°C.

Low-temperature WHOI probes (LTW) record temperatures up to 125°C, with an accuracy of ±0.22°C, and a resolution of 0.025°C.

Low-temperature NKE probes (LTNKE) record temperatures up to 100°C, with an accuracy of ±0.5°C, and a resolution of 0.12°C at 60°C.

IPGP LT probe (LTI). This probe is a prototype with a titanium housing a xxx thermocouple and a OM-CP-RTDTEMP101A (Omega) logger. It record temperatures up to x°C, with an accuracy of ±x°C, and a resolution of x°C.

LTGrad probes comprise 2 LTiButton probes separated by 7 cm and attached to a 25 to 30 cm-long PVC support. Low-temperature iButton probes (LTiButton) record temperatures up to 85°C, with an accuracy of ±0.5°C, and a resolution of ±0.5°C.


Sensor setup

Test and calibration

All probes are synchronized to UTC time before deployment. Temperature readings of WHOI probes are checked with an oven at IPGP whenever the probe is not redeployed... which is not frequent because we do not have many spares. NKE probes are sent back to maker every 3-4 years for battery change and calibration. Clock drift at recovery is listed in the metadata file. EMSOAzores_auton_T_probes_2021_2022.docx

Data management

  • Real time data transmission : No
  • Data storage in the Communication and storage unit (COSTOF2): No
  • Data storage in the instrument: Full
File Size Format Processing Access
Metadata 202 KB PDF Open access
10 MB TEXTE Raw data Access on demand until 2024-10-01
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How to cite 

Cannat Mathilde, Fontaine Fabrice, Mahato Souradeep, Sarradin Pierre-Marie, Matabos Marjolaine, Sarrazin Jozee (2022). Autonomous temperature probes data from the EMSO-Azores observatory, 2021-2022. SEANOE.