Oceanographic processes: Temperatures, dissolved oxygen and acidification
Highlights
The summary indicator demonstrates that the temperature of the three levels of the St-Lawrence (surface, intermediate, deep) as well as the hypoxia and acidity conditions of the estuary remain at the intermediate level for the 2013-2017 period. However, a deteriorating trend of the general state was recorded from 2008 to 2012 and was mostly due to the high temperature of the deep waters which started to climb in 1915. The global tendency is also due to the decline of dissolved oxygen and the level of acidity in the St-Lawrence estuary, who both reached new records.