Deoxygenation: Let’s the ocean breathe again

With climate change, marine species face the combined effect of multiple threats: warming, acidification and oxygen decline. Marine deoxygenation may be the most threatening of all stressors to marine life and has important detrimental consequences on marine ecosystems, and therefore a global impact on the Earth system. Hot spots of change that host extended Oxygen Minimum Zones (OMZ) are found particularly in the highly productive Eastern Boundary Upwelling Systems. Current knowledge about the causes, impacts and threats of deoxygenation will be presented. I will focus on the South East Pacific and illustrate how climate velocities of the metabolic index of a model marine species can be a useful diagnostics for inferring broad regions where metabolic conditions will change in the future and therefore of potential metabolic refugia. Then I will present my future involvement in two projects of the Environmental Biogeochemistry Team from IPGP, namely the Polar Pod and the Islands Mass effects ISLES project, highlighting relevant past work on the Southern Ocean and on Lagrangian diagnostics, giving potential routes forward.