09 Dec 2022
09 Dec 2022
Status: this preprint is currently under review for the journal ESSD.

Ocean cross-validated observations from the R/Vs L'Atalante, Maria S. Merian and Meteor and related platforms as part of the EUREC4A-OA/ATOMIC campaign

Pierre L'Hégaret1, Florian Schütte2, Sabrina Speich1, Gilles Reverdin3, Dariusz B. Baranowski4, Rena Czeschel5, Tim Fischer5, Gregory R. Foltz6, Karen J. Heywood7, Gerd Krahmann5, Rémi Laxenaire1, Caroline Le Bihan8, Philippe Le Bot8, Stéphane Leizour8, Callum Rollo7, Michael Schlundt5, Elizabeth Siddle7, Corentin Subirade1, Dongxiao Zhang9,10, and Johannes Karstensen5 Pierre L'Hégaret et al.
  • 1LMD/IPSL, CNRS, ENS, École Polytechnique, Institut Polytechnique de Paris, PSL, Research University, Sorbonne Université, Paris, France
  • 2Max-Planck-Institute for Meteorology, KlimaCampus, Hamburg, Germany
  • 3Sorbonne Université, CNRS, IRD, MNHN, UMR7159 LOCEAN/IPSL, Paris, France
  • 4Institute of Geophysics, Polish Academy of Sciences, Warsaw, Poland
  • 5GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
  • 6NOAA, Atlantic Oceanographic and Meteorological Laboratory, Miami, FL, USA
  • 7Centre for Ocean and Atmospheric Sciences, School of Environmental Sciences, University of East Anglia, Norwich, UK
  • 8French Research Institute for Exploitation of the Sea (IFREMER), UBO, CNRS, IRD, Laboratoire d’Océanographie Physique et Spatiale (LOPS), IUEM, Plouzané, France
  • 9Cooperative Institute for Climate, Ocean, and Ecosystem Studies, University of Washington, Seattle, WA, USA
  • 10NOAA PMEL, Seattle, WA, USA

Abstract. The northwestern Tropical Atlantic Ocean is a turbulent region, filled with mesoscale eddies and large-scale currents. In this intense dynamical context, several water masses with thermohaline characteristics of different origins are advected, mixed, and stirred, at the surface and at depth. The EUREC4A-OA/ATOMIC experiment that took place in January and February 2020 was dedicated to assess the processes at play in this region, especially the interaction between the ocean and the atmosphere. For that, four oceanographic vessels and different autonomous platforms measured properties near the air-sea interface and acquired thousands of upper-ocean (400–2000 m) profiles. However, each device had its own observing capability, varying from deep measurements acquired during vessel stations to shipboard underway near-surface observations and measurements from autonomous and uncrewed systems (such as Saildrones). These observations were undertaken with a specific sampling strategy guided by near-real time satellite images and adapted every half day based on the process that was investigated. These processes were characterized by different spatio-temporal scales: from mesoscale eddies, with diameters exceeding 100 km, to submesoscale filaments of 1 km width. This article describes the data sets gathered from the different devices and how the data were calibrated and validated, in order to ensure an overall consistency, the platforms' datasets are cross-validated using a hierarchy of instruments defined by their own specificity and calibration procedures. This has enabled the quantification of the uncertainty of the measured parameters when the different datasets are used together (

Pierre L'Hégaret et al.

Status: open (until 03 Feb 2023)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on essd-2022-402', Anonymous Referee #1, 08 Jan 2023 reply

Pierre L'Hégaret et al.

Data sets

uCTD Data 2nd QC- EUREC4A_OA/ATOMIC Pierre L'Hégaret, Sabrina Speich, Johannes Karstensen

MVP Data 2nd QC- EUREC4A_OA/ATOMIC Pierre L'Hégaret, Sabrina Speich, Johannes Karstensen

EUREC4A Operational Center Johannes Karstensen, Sabrina Speich

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). Pierre L'Hégaret, Sabrina Speich, Johannes Karstensen

Pierre L'Hégaret et al.


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Short summary
In early 2020, the EUREC4A-OA/ATOMIC experiment took place in the northwestern Tropical Atlantic Ocean, a dynamical region where different water masses interact. Four oceanographic vessels and a fleet of autonomous devices were deployed to study the processes at play and sample the upper-ocean, each with its own observing capability. The article first describes the data calibration and validation, and second their cross-validation using a hierarchy of instruments, and estimating the uncertainty.