Atlantic Zone Bottom Dissolved Oxygen Time Series 2014-2023

2014-2023 time series of bottom dissolved oxygen measurements from 49 stations in the Estuary and Gulf of St. Lawrence. The dataset includes data from 3 fixed stations and 46 stations grouped into transects, sampled during June and autumn surveys. It is managed by Fisheries and Oceans Canada's Atlantic Zone Monitoring Program (AZMP).

Use Cases

• Analyze temporal trends in Dissolved_Oxygen/Oxygène_Dissous(%sat) at fixed stations like Rimouski for long-term ecosystem monitoring.
• Model spatial patterns of bottom Dissolved_Oxygen using Latitude and Longitude coordinates from 49 stations across the Quebec region.
• Correlate Dissolved_Oxygen measurements with Depth/Profondeur(m) and Sounding(m) data to study vertical oxygen distribution.
• Compare seasonal oxygen levels by joining June and autumn survey data layers based on Station and Date(UTC).
• Assess interannual variability in Dissolved_Oxygen by examining the 10-year time series, excluding the unsampled year 2020.

Strengths

• Includes a decadal time series from 2014 to 2023, providing a substantial temporal baseline.
• Covers 49 distinct geographic stations (3 fixed, 46 transect-based) in the Estuary and Gulf of St. Lawrence.
• Data is collected under a standardized national monitoring protocol (AZMP sampling protocol).
• Each station is associated with both a graphical time series (.png) and the underlying tabular data (.csv).

Limitations

• The 2020 survey year was not sampled, creating a gap in the annual time series.
• Sample data and specific row/column counts are unavailable, limiting pre-download assessment of dataset size and structure.
• Spatial coverage is limited to the Quebec region's portion of the AZMP, not the full Northwest Atlantic shelf.

Provenance

Source

Fisheries and Oceans Canada, Atlantic Zone Monitoring Program (AZMP).

Collection Method

Field measurements from CTD profiles at fixed and transect stations, collected during biannual surveys (June and autumn).

Time Range

2014 to 2023 (with 2020 not sampled for surveys).

Freshness

Data includes measurements up to 2023, with the dataset record last updated in March 2026.

Geography

Estuary and Gulf of St. Lawrence, under the Quebec region responsibility of the AZMP.