Deep Water Dissolved Oxygen in the St. Lawrence Estuary and Gulf (2014-2023)

2014 to 2023 data from annual August multidisciplinary surveys in the Estuary and Gulf of St. Lawrence. The dataset contains interpolated dissolved oxygen measurements for deep water (>200m) on a 10 km x 10 km grid. It is produced by Fisheries and Oceans Canada to describe environmental conditions and monitor marine resources.

Use Cases

• Analyze temporal trends in deep water dissolved oxygen concentrations from 2014 to 2023 for climate impact studies.
• Map the spatial distribution of dissolved oxygen on the 10 km grid to identify hypoxic zones in the Estuary and Gulf.
• Correlate dissolved oxygen levels with other survey data (e.g., species biomass) to study ecosystem health in the St. Lawrence.

Strengths

• Decadal temporal coverage from 2014 to 2023, providing a multi-year time series.
• Spatial data is interpolated onto a standardized 10 km x 10 km grid for consistent analysis.
• Data is collected via a standardized Atlantic Zonal Monitoring Program (AZMP) sampling protocol.

Limitations

• Data is limited to deep water (>200m), excluding surface and mid-depth oxygen conditions.
• Observations are restricted to the annual August survey period, missing seasonal variability.
• The specific number of data points (rows) and measurement variables (columns) is not provided.

Provenance

Source

Fisheries and Oceans Canada.

Collection Method

Dissolved oxygen determined from CTD profiles during annual multidisciplinary surveys, interpolated to a 10 km grid.

Time Range

2014 to 2023.

Freshness

Data is updated annually from the August survey; the record was last updated in March 2026.

Geography

Estuary and northern Gulf of St. Lawrence.