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Ocean acidification in the Gulf of St. Lawrence

Maurice Lamontagne Institute - Canada

North Atlantic Ocean, Project, Protect and restore ecosystems and biodiversity, Sustainably feed the global population, Unlock ocean-based solutions to climate change

Ocean acidification (OA) is particularly important in the Gulf of St. Lawrence (GSL) due to high river runoff and high primary production that is routed towards the deep layer where it is remineralized to dissolved inorganic carbon, increasing pCO2 and lowering pH and calcium carbonate saturations (omega).

Lavoie et al. showed higher acidification occurring in the estuary, at mid-depth in the northwest GSL and on the Magdalen Shallows, with large daily and seasonal variability. Many marine species are negatively impacted by OA conditions. OA thresholds are highly species-specific and duration-dependent. Monitoring provides information on actual OA conditions but not on their duration.

This Project is hosted by the Ocean Decade Programme Ocean Acidification Research for Sustainability (OARS)

Start date: 01/04/2021
End date: 31/03/2024

Lead Contact: Diane Lavoie (