search DOI 10.17882/57005

Array of Ocean Bottom Tilt Current Meters: data from the EMSO-Azores observatory, 2017-2018

This dataset contains current data acquired between July 2017 and August 2018 using 3 TCM3 Ocean Bottom Tilt Current Meters installed next to the Tour Eiffel, Montségur and Crystal hydrothermal vent sites.

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 array comprises 3 currentmeters, deployed near the Tour Eiffel, Montségur and Crystal hydrothermal vent sites. It is not connected to an energy node. 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 Table_TCM3EMSO_Azores 2016-2018.

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, MoMARSAT2017, MoMARSAT2018

Location

37.30134N, 37.2888S, -32.275618E, -32.27982W

Devices

Parameters

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

Location

  • Regional node: Emso-Azores
  • Site: Lucky Strike hydrothermal field
  • coordinates: see Table_TCM3EMSO_Azores 2016-2018

Installation

Recovery

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 are 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).

Test and 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 is provided as text, and not corrected for the time drift. Time drift is provided as metadata in Table_TCM3EMSO_Azores 2016-2018.

Data management

  • Real time data transmission: No
  • Data storage in the Communication and storage unit (COSTOF2): No
  • Data storage in the instrument: Full

Data

Alternative access to data

FileSizeFormatProcessingAccess
Current data
19 MoCSVRaw data
Download
Temperature data
5 MoCSVRaw data
Download
Sensor metadata
16 KoXLS, XLSX
Download
Sites
72 octetsTEXT
Download
Current data TCM3-1
6 MoNetCDFRaw data
Download
Current data TCM3-2
6 MoNetCDFRaw data
Download
Current data TCM3-3
6 MoNetCDFRaw data
Download
How to cite
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

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Oceanographic cruises
MOMARSAT2017
Related documents
Wheeler Benjamin, Cannat Mathilde, Chavagnac Valérie, Fontaine Fabrice (2024). Diffuse Venting and Near Seafloor Hydrothermal Circulation at the Lucky Strike Vent Field, Mid-Atlantic Ridge. Geochemistry Geophysics Geosystems - G3. 25 (03). e2023GC011099 (26p.). https://archimer.ifremer.fr/doc/00879/99126/
Lantéri Nadine, Ruhl Henry A., Gates Andrew, Martínez Enoc, Del rio Fernandez Joaquin, Aguzzi Jacopo, Cannat Mathilde, Delory Eric, Embriaco Davide, Huber Robert, Matabos Marjolaine, Petihakis George, Reilly Kieran, Rolin Jean-Francois, van der Schaar Mike, André Michel, Blandin Jerome, Cianca Andrés, Francescangeli Marco, Garcia Oscar, Hartman Susan, Lagadec Jean Romain, Legrand Julien, Pagonis Paris, Piera Jaume, Remirez Xabier, Toma Daniel M., Marinaro Giuditta, Moreau Bertrand, Santana Raul, Wright Hannah, Dañobeitia Juan José, Favali Paolo (2022). The EMSO Generic Instrument Module (EGIM): Standardized and Interoperable Instrumentation for Ocean Observation. Frontiers In Marine Science. 9. 801033 (17p.). https://doi.org/10.3389/fmars.2022.801033, https://archimer.ifremer.fr/doc/00756/86848/
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