Preprints
https://doi.org/10.5194/essd-2023-232
https://doi.org/10.5194/essd-2023-232
26 Jul 2023
 | 26 Jul 2023
Status: a revised version of this preprint is currently under review for the journal ESSD.

A year of transient tracers chlorofluorocarbon 12 and sulfur hexafluoride, noble gases helium and neon, and tritium in the Arctic Ocean from the MOSAiC expedition (2019–2020)

Céline Heuzé, Oliver Huhn, Maren Walter, Natalia Sukhikh, Salar Karam, Wiebke Körtke, Myriel Vredenborg, Klaus Bulsiewicz, Jürgen Sültenfuß, Ying-Chih Fang, Christian Mertens, Benjamin Rabe, Sandra Tippenhauer, Jacob Allerholt, Hailun He, David Kuhlmey, Ivan Kuznetsov, and Maria Mallet

Abstract. Trace gases have demonstrated their strength for oceanographic studies, with applications ranging from the tracking of glacial meltwater plumes to estimates of the abyssal overturning duration. Yet measurements of such passive tracers in the ice-covered Arctic Ocean are sparse. We here present a unique data set of trace gases collected during the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition, during which the R/V Polarstern drifted along with the Arctic sea ice from the Laptev Sea to Fram Strait, from October 2019 to September 2020. During the expedition, trace gases from anthropogenic origin chlorofluorocarbon 12 (CFC-12), sulfur hexafluoride (SF6), and tritium, along with noble gases helium and neon and their isotopes were collected at a weekly or higher temporal resolution throughout the entire water column and occasionally in the snow, from the ship and from the ice. We describe the sampling procedures along with their challenges, the analysis methods, the data set, and present case studies in Fram Strait and the Central Arctic Ocean to illustrate possible usage for the data along with their robustness. Combined with simultaneous hydrographic measurements, this trace gases data set can be used for process studies and water mass tracing throughout the Arctic in subsequent analyses.

Céline Heuzé et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on essd-2023-232', Anonymous Referee #1, 21 Aug 2023
    • AC2: 'Reply on RC1', Céline Heuzé, 29 Sep 2023
  • CC1: 'Comment on essd-2023-232', Núria Casacuberta, 01 Sep 2023
    • AC3: 'Reply on CC1', Céline Heuzé, 29 Sep 2023
  • RC2: 'Comment on essd-2023-232', Anonymous Referee #2, 01 Sep 2023
    • AC1: 'Reply on RC2', Céline Heuzé, 29 Sep 2023
  • AC4: 'Comment on essd-2023-232', Céline Heuzé, 29 Sep 2023

Céline Heuzé et al.

Céline Heuzé et al.

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Short summary
Gases dissolved in the ocean water not used by the ecosystem, or "passive tracers", are invaluable to track water over long distances and investigate the processes that modify its properties. Unfortunately, especially so in the ice-covered Arctic Ocean, such gas measurements are sparse. We here present a data set of several passive tracers (anthropogenic gases, noble gases and their isotopes) collected over the full ocean depth, weekly, during the 1-year drift in the Arctic "MOSAiC".