search DOI 10.17882/101802

Array of Ocean Bottom Tilt Current Meters: data from the EMSO-Azores observatory, 2023-2024

This dataset contains current data acquired between july 2023 and august 2024 using 5 TCM-3 Ocean Bottom Tilt Current Meters installed next to the Tour Eiffel, hydrothermal vent site and near the SeaMon west station.

The TCM-3 Ocean Bottom Tilt Current Meter from Lowell Instruments LLC (North Falmouth, MA, USA) measures current using the drag-tilt principle. The logger is buoyant and is anchored to the bottom via a short flexible tether. Drag from moving water tilts the logger in the direction of flow. The logger’s accelerometer and magnetometer channels are used to record the amount of tilt and direction of tilt (compass bearing). The currentmeter's internal clocks are set to UTC time before deployment. Clock drift after recovery is not implemented in data but added as metadata in metadata file.

Data are provided for each deployed instrument as two text files:

  • current data
  • temperature data

Disciplines

Physical oceanography

Keywords

Mid-Atlantic Ridge, EMSO-Azores, EMSO, Hydrothermal Vents, Lucky Strike, Eiffel Tower, Crystal, Montsegur, current velocity, current direction, near seafloor seawater temperature, Time-series, MoMARSAT2023, MoMARSAT2024.

Location

37.3N, 37.28S, -32.27E, -32.29W

Devices

Parameters

  • temperature (°C)
  • current velocity (m/s)
  • current direction (° from magnetic N)

Location

  • Regional node: Emso-Azores
  • Site: Lucky Strike hydrothermal field
  • coordinates: see metadata file

Installation

Cruise: MATABOS Marjolaine (2023) MoMARSAT2023 cruise, RV L'Atalante, https://doi.org/10.17600/18002419

Recovery

Cruise: MATABOS Marjolaine and Sarradin Pierre-Marie (2024) MoMARSAT2024 cruise, RV L'Atalante, https://doi.org/10.17600/18003300

Operating parameters

For deployments near selected hydrothermal vents at the EMSO-Azores observatory, the accelerometer and magnetometer are configured with a burst interval of 1 minute, a burst rate of 8 Hz and a burst duration of 15 seconds. Temperature is recorded with a period of 1 minute.

Sensor metadata

The specifications of the magnetometer, accelerometer and temperature probes are as follows:

  • magnetometer: 3-axis magnetoresistive sensor and 12-bit A/D Converter, range +/- 1.3 Gauss, accuracy +/- 1° typical (nominal compass bearing), resolution < 0.001 Gauss, maximum recording rate 64 Hz, measurement duration 6 mS
  • accelerometer: 3-axis MEMS Accelerometer and 10-bit A/D Converter, software averaging: up to 32 values per measurement (25 samples per measurement are averaged when recording at 64 Hz), range +/- 2 g, accuracy < 0.01 g (enables 1° inclination determination), resolution < 0.001 g, maximum recording rate 64 Hz, measurement duration 0.625 ms per sample, 32 samples per recorded value (15.6 ms total sample time at 64 Hz 20 ms at 32 Hz or less)
  • thermistor: NTC Thermistor and 16-bit A/D Converter, low-pass filter rejects 50/60 Hz noise, range -5 to 30 °C (standard), -20 to 50 °C (extended), accuracy +/-0.1 °C (standard), +/-0.2 °C (extended), resolution < 0.01 °C, maximum rate 1 Hz, time constant 4 minutes typical (when plunged into an ice bath).

Sensor calibration A set of calibration coefficients for the magnetometer, accelerometer, and temperature channels are stored in the logger. The magnetometer and accelerometer coefficients are unique to each instrument while temperature coefficients are specific to each manufacturing lot. The calibration coefficients are applied upon recovery when the binary data is converted to text data.

Data management

  • Real time data transmission: No
  • Data storage in the Communication and storage unit (COSTOF2): No
  • Data storage in the instrument: Full
  • Data is provided in text format, not corrected for the time drift. Time drift is provided as metadata in metadata file

Data

FileSizeFormatProcessingAccess
Metadata
72 KoPDF
Download
Data
37 MoCSVRaw data
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How to cite
Cannat Mathilde, Gayet Nicolas, Rodier Philippe, Demont Antoine, Matabos Marjolaine, Sarradin Pierre-Marie (2024). Array of Ocean Bottom Tilt Current Meters: data from the EMSO-Azores observatory, 2023-2024. SEANOE. https://doi.org/10.17882/101802

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Oceanographic cruises
MoMARSAT2023
Related datasets
Cannat Mathilde, Gayet Nicolas, Demont Antoine, Fontaine Fabrice, Matabos Marjolaine, Sarradin Pierre-Marie (2024). Array of Ocean Bottom Tilt Current Meters: data from the EMSO-Azores observatory, 2022-2023. SEANOE. https://doi.org/10.17882/100007
Cannat Mathilde, Gayet Nicolas, Souradeep Mahato, Fontaine Fabrice, Matabos Marjolaine, Sarradin Pierre-Marie, Sarrazin Jozee (2022). Array of Ocean Bottom Tilt Current Meters: data from the EMSO-Azores observatory, 2021-2022. SEANOE. https://doi.org/10.17882/91238
Cannat Mathilde, Matabos Marjolaine, Van Audenhaege Loic, Gayet Nicolas, Wheeler Benjamin, Souradeep Mahato, Sarradin Pierre-Marie, Sarrazin Jozee, Legrand Julien (2021). Array of Ocean Bottom Tilt Current Meters: data from the EMSO-Azores observatory, 2019-2021. SEANOE. https://doi.org/10.17882/76001
Cannat Mathilde, Wheeler Benjamin, Chen Jie, Sarradin Pierre-Marie, Legrand Julien (2020). Array of Ocean Bottom Tilt Current Meters: data from the EMSO-Azores observatory, 2018-2019. SEANOE. https://doi.org/10.17882/74378
Cannat Mathilde, Wheeler Benjamin, Rouméjon Stéphane, Sarradin Pierre-Marie, Legrand Julien (2018). Array of Ocean Bottom Tilt Current Meters: data from the EMSO-Azores observatory, 2017-2018. SEANOE. https://doi.org/10.17882/57005
Cannat Mathilde, Wheeler Benjamin, Barreyre Thibaut, Sarradin Pierre-Marie, undefined undefined (2017). Array of Ocean Bottom Tilt Current Meters: data from the EMSO-Azores observatory, 2016-2017. SEANOE. https://doi.org/10.17882/74195
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