Concatenated Temperature, Salinity, and Velocity measurements from EUREC4A_OA/ATOMIC (CTD, uCTD, MVP and S-ADCP data from the R/Vs L'Atalante and Maria S. Merian)

Date 2020-01
Author(s) L'Hegaret PierreORCID1, Speich SabrinaORCID1, Karstensen JohannesORCID2
Affiliation(s) 1 : Ecole Normale Superieure, Departement des Geosciences, Laboratoire de Météorologie Dynamique, IPSL, PSL, Paris, France
2 : GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel, Germany
DOI 10.17882/92071
Publisher SEANOE
Keyword(s) CTD, uCTD, MVP, S-ADCP, Processed, Temperature, Salinity, Velocity
Abstract

The EUREC4A-OA oceanographic campaign that took place in January-February 2020 in the tropical North-West Atlantic Ocean aboard several research vessels, was a contribution to the broader international research initiative EUREC4A (http://eurec4a.eu/). The cruise was carried out in conjunction with the research vessels L'Atalante (France), Maria S. Merian and Meteor (Germany) and the Ron Brown (USA) as well as with the aircraft and UAV operations and continuous observations from the ground site on the island of Barbados (BCO) and the Saildrone© operations as part of the US ATOMIC project.

This dataset is composed of the different sections performed by the R/Vs L'Atalante and Maria S. Merian. For thermohaline measurements, they are composed of concatenated CTD, uCTD and MVP measurements lineary interpolated on a 0.5dbar vertical grid. The velocity measurements are composed of both S-ADCP frequencies (38 and 150kHz for the R/V L'Atalante, and 38 and 75kHz for the R/V Maria S. Merian), again linearly interpolated on a 0.5 dbar vertical grid. The uCTD measurements are processed using a toolbox from GEOMAR-PO based on the article from Ullman and Hebert (JAOT, 2014). A similar processing is done for the MVP. To specifically correct the discrepancies between downward and upward profiles, the method described in Mensah et al (JAOT, 2018) was implemented. A secondary quality check is performed by comparing the uCTD and MVP measurements with the nearest CTD stations, providing an estimation of temperature and salinity uncertainties.

Licence CC-BY
Acknowledgements The processing of uCTD and MVP was based on the article from Ullman and Hebert (2014), Processing of Underway CTD Data, Journal of Atmospheric and Oceanic Technology, https://doi.org/10.1175/JTECH-D-13-00200.1 Correction between upward and downward cast was based on the method from Mensah et al (2018), A Correction for the Thermal Mass–Induced Errors of CTD Tags Mounted on Marine Mammals, Journal of Atmospheric and Oceanic Technology, https://doi.org/10.1175/JTECH-D-17-0141.1
Sensor metadata

CTD sensors
For the R/V L'Atalante : Temperature (SBE3+): Primary: S/N 2911, Secondary: S/N 4594, Conductivity (SBE4c): Primary: S/N 3194, Secondary: S/N 3166
For the R/V Maria S. Merian : Temperature (SBE3+): Primary: S/N 2463, Secondary: S/N 2120, Conductivity (SBE4c): Primary: S/N 2443, Secondary: S/N 3959

uCTD are developed by TELEDYNE Oceanscience.
For the R/V L'Atalante two uCTD probes were deployed: S/N 70200293 and 70200333
For the R/V Maria S. Merian three uCTD probes were deployed: S/N 70200054, 70200155 and 70200183

MVP 30-350 are profiling system from AML oceanographic.
For the R/V L'Atalante: S/N 8705
For the R/V Maria S. Merian: S/N 9068

2 Ocean Surveyor S-ADCP from Teledyne RD Instrument were mounted on each R/Vs' hull
For the R/V L'Atalante: 38kHz and 150kHz
For the R/V Maria S. Merian: 38kHz and 75kHz

Data
File Size Format Processing Access
Temperature and salinity measurements of sections from the R/V L'Atalante 5 MB Archive Zip (.zip) Processed data Open access
Temperature and salinity measurements of sections from the R/V Maria S. Merian 2 MB Archive Zip (.zip) Processed data Open access
Velocity measurement of sections from the R/V L'Atalante 452 MB Archive Zip (.zip) Processed data Open access
Velocity measurement of sections from the R/V Maria S. Merian 294 MB Archive Zip (.zip) Processed data Open access
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How to cite 

L'Hegaret Pierre, Speich Sabrina, Karstensen Johannes (2020). Concatenated Temperature, Salinity, and Velocity measurements from EUREC4A_OA/ATOMIC (CTD, uCTD, MVP and S-ADCP data from the R/Vs L'Atalante and Maria S. Merian). SEANOE. https://doi.org/10.17882/92071