CTD DATA - EUREC4A_OA Atalante Cruise

Date 2021-02-15
Temporal extent 2020-01-19 -2020-02-19
Author(s) Speich SabrinaORCID1, Carton XavierORCID2, Reverdin GillesORCID3, Branellec Pierre2, Le Bihan CarolineORCID2, Laxenaire RemiORCID6, L'Hegaret PierreORCID1, 2, Leizour Stephane2, Le Bot Philippe2, Noisel ChristopheORCID3, Manta GastonORCID1, Meroni AgostinoORCID4, Napoli AnnaORCID5, Chen Yanxu1, Masson SébastienORCID, Le Gal Alex2, Olivier LéaORCID3
Affiliation(s) 1 : LMD, IPSL, ENS-PSL, CNRS, Ecole Polytechnique, Ecole des Ponts, Paris, France
2 : LOPS, UBO-IUEM, Ifremer, CNRS, IRD, Brest, France
4 : CIMA Foundation, Italy
5 : UNIMIB, Italy
DOI 10.17882/79096
Publisher SEANOE

The EUREC4A-OA oceanographic campaign that took place in January-February 2020 in the tropical North-West Atlantic Ocean aboard the research vessel L'Atalante was a contribution to the broader international research initiative EUREC4A (http://eurec4a.eu/). The cruise was carried out in conjunction with the research vessels 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.

The overall objective of the EUREC4A-OA campaign was to collect observational data that will enable research on dynamic and thermodynamic processes in the atmosphere and the ocean, in order to better understand the role of fine ocean scales both in the internal dynamics of the ocean and in air-sea interactions.  To this end, measurements of oceanic and atmospheric profiles have been carried out to observe the temporal evolution and spatial heterogeneity of the atmospheric and oceanic boundary layers and the properties in these two fluids beyond these layers. Autonomous observation platforms (submarine glider, Argo profiling floats, surface buoys and the OCARINA and PICCOLO prototypes) complemented the observations carried out on board ships.

Licence CC-BY-NC
Acknowledgements We thank captain Philippe Robbe, his officers and the crew of RV L’Atalante for their support of our observational program and the hospitality and friendliness on board. We also thank the crew on deck, in the engine rooms and the galley for providing and supporting an excellent working environment. The ship time was provided by the French Research Oceanographic Fleet (FOF). The cruise very much benefited from multiple financial contributions provided by the research institutions involved. Namely, This work has been funded by the FOF, the French National LEFE/IMAGO-GMMC EUREC4A-OA project, from Ifremer, from CNRS-INSU, from the JPI-Ocean EUREC4A-OA project, from the TOSCA SMOS-Ocean project supported by the French Spatial Agency CNES (Centre National d’Etudes Spatiales), from the H2020 TRIATLAS project and from the Department of Geosciences at ENS via the Chaire Chanel. Support for the salinity drifters was provided by the Climate Variability and Predictability Program of NOAA's Climate Program Office. NOAA/AOML's Physical Oceanography Division. We benefited from numerous data sets made freely available and listed here : the ADT, SLA and currents maps produced by Ssalto/Duacs distributed by the CMEMS (https://resources.marine.copernicus.eu), the Chla and SST maps produced by CLS, the MUR SST produced by JPL, the SMOS L2Q maps produced by CATDS (CATDS, 2019), the SMAP maps produced by Remote Sensing System and CCI+SSS maps produced in the frame of ESA CCI+SSS project. We also acknowledge support from MeteoFrance, MercatorOcean (France) and FSU (FL, USA) who provided us with daily atmosphere and ocean forecasts. Finally, we acknowledge support from AERIS and IPSL for providing assistance and services by ensuring a smooth daily data flow to and from the ship.
Sensor metadata

For hydrology acquisition, we used the LOPS frame (28 bottles of 8 liters on two levels) with only 14 bottles on the high level, the bottles on the low level hadn’t caps. The frame is also equipped with a SBE911+ CTD, 2 LADCP, electronic reversing sensors and other sensors.The  CTD was controlled from the LOPS computer container.

The same Seabird 911+ CTD probe (s/n. 813) was used throughout the cruise. It was equipped with two sets of T, C, and O2 sensors. On the CTD frame were also mounted, 2 LADCP (RDI 300 kHz), 4 SIS reversing sensors (Pressure and Temperature), a Wet labs transmissometer, a Chelsea fluorometer, a Par & Spar and an IXSEA pinger.

The CTD sensors used are as follows:


                                                  Primary sensors                        Secondary sensors 

Temperature (SBE3+)                s/n 2911                                  s/n 4594

Conductivity (SBE4c)                s/n 3194                                  s/n 3166

Oxygen (SBE43)                        s/n 1402                                  s/n 526 



Electronics mounted on the LOPS frame:


            PASH 6000 Rosette, top          s/n 462            PASH 6000 Rosette, bottom     s/n 461

            IXSEA Pinger                          s/n 530            


            Downward-looking ADCP:      s/n 2002          RDI 300 kHz WorkHorse

            Upward-looking ADCP:           s/n 12492        RDI 300 kHz WorkHorse


            SIS sensors                             BT3                 BT5

            reversing pressure meter          s/n 6664          s/n 6665          RPM 6000 X

            reversing thermometer             s/n 1751          s/n 1752          RTM 4002 X


            Fluorometer Chelsea Aqua 3:   s/n 09-7117-003   Transmisso. Wet Labs C-Star    s/n 372DR

            Par Biospherical Licor Chelsea: s/n 70494       Spar Surface Irradiance: s/n 6301


The CTD data file contain the processed physical parameter collected by the CTD and dissolved oxygen.


File Size Format Processing Access
CTD data file; variables per stations and pressure levels 19 MB NC, NetCDF Processed data Open access
CTD data file; variables per stations and depth levels 18 MB NC, NetCDF Processed data Open access
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How to cite 

Speich Sabrina, Carton Xavier, Reverdin Gilles, Branellec Pierre, Le Bihan Caroline, Laxenaire Remi, L'Hegaret Pierre, Leizour Stephane, Le Bot Philippe, Noisel Christophe, Manta Gaston, Meroni Agostino, Napoli Anna, Chen Yanxu, Masson Sébastien, Le Gal Alex, Olivier Léa (2021). CTD DATA - EUREC4A_OA Atalante Cruise. SEANOE. https://doi.org/10.17882/79096