Chlorophyll-a satellite data for the Estuary and the Gulf of St. Lawrence


The colour of seawater, seen from space, is used to estimate the chlorophyll content in the water. This pigment is an index of the biomass of microscopic algae. Compared to the Atlantic Ocean, the waters of the Estuary and Gulf of St. Lawrence are rather isolated and are strongly mixed with fresh water from many rivers.

The method for retrieving chlorophyll must be adapted to these specificities. This dataset presents the result of a method developed to find the concentration of chlorophyll-a derived by various satellites (5) in the estuary and the Gulf of St. Lawrence. The 2 satellites (AQUA and VIIRS) are still active and collect daily data.

This project is part of the Coastal Environmental Baseline Program Initiative under the Oceans Protection Plan of Fisheries and Oceans Canada.

USAGE NOTE : Some of the CSV files below are large. They have therefore been compressed to facilitate downloading. Once uncompressed, it is advised to open these files using programs such as Notepad ++, Sublime Text, MATLAB, RStudio, etc. Since Microsoft Excel is not suitable for the size of daily files (approximately 1,500,000 lines per file), it partially truncates the data.

Source identification:


Fisheries And Oceans Canada. (2020). Données satellitaires de chlorophylle-a pour l'estuaire et le golfe du St-Laurent (Version 1) [Data set]. Observatoire Global du Saint-Laurent.

Access and Use

Licence: Creative Commons Attribution 4.0

Data and Resources


Dataset extent

Map data © OpenStreetMap contributors

Metadata Reference Date(s) June 23, 2022 (Creation)
June 23, 2022 (Revision)
Dataset Reference Date(s) August 04, 2020 (Creation)
January 05, 2022 (Revision)
Frequency of Update Quarterly

Responsible Party 1
Julien Laliberté
Pêches et Océans Canada
  • Point of Contact
  • Resource Provider

Field Value
Ocean Variables Other
Scope Dataset
Status On Going
Spatial Extent { "coordinates": [ [ [ -55.4, 51.9 ], [ -71.31, 51.9 ], [ -71.31, 45.19 ], [ -55.4, 45.19 ], [ -55.4, 51.9 ] ] ], "type": "Polygon" }
North Bounding Latitude 51.9
South Bounding Latitude 45.19
East Bounding Longitude -55.4
West Bounding Longitude -71.31
Temporal Extent
Default Locale French
Citation identifier
Code Space