Dissolved oxygen (DO) status and trend in various regions. Most of the trends are based on short time series, which could be strongly influenced by natural (e.g., decadal) variability. However, long-term time series do exist for the Northeast Pacific (Station P) and in the Gulf of St. Lawrence, and these show statistically significant declining trends in DO. The 200 m and 1000 m depth contours are indicated by the light and dark blue lines.
Data from DFO monitoring programs (Galbraith et al., 2017; Yashayaev et al., 2014; Chandler et al., 2017).