The crucial contribution of mixing to present and future ocean oxygen distribution

Marina Lévy, Laure Resplandy, Jaime B. Palter, Damien Couespel, Zouhair Lachkar

Research output: Chapter in Book/Report/Conference proceedingChapter


The oxygen content of the ocean interior largely results from a balance between respiration and advective ventilation, with only a small contribution from mixing processes. However, two important characteristics, which are key to future oxygen distribution in the ocean, primarily depend on the strength of ocean mixing. The first relates to the oxygen minimum zones (OMZ), which are wide O2-deficient mesopelagic layers inhospitable to most marine macro-fauna. We illustrate how mixing intensity controls the volume of all major OMZs. The second relates to one of the most worrying responses of the ocean to climate change: deoxygenation, including in OMZs. Several observational and model studies show that reduction in oxygen mixing plays a dominant role in global deoxygenation. Uncertainties in the representation of mixing in Earth system models and difficulties to measure mixing rates in the field hinder our ability to project the future evolution of OMZs.

Original languageEnglish (US)
Title of host publicationOcean Mixing
Subtitle of host publicationDrivers, Mechanisms and Impacts
Number of pages16
ISBN (Electronic)9780128215128
ISBN (Print)9780128215135
StatePublished - Jan 1 2021


  • Deoxygenation
  • Diapycnal mixing
  • Eddy mixing
  • Isopycnal mixing
  • Mixing parameterisations
  • Oxygen minimum zone
  • Ventilation

ASJC Scopus subject areas

  • General Environmental Science


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