Articles | Volume 6-osr9
https://doi.org/10.5194/sp-6-osr9-12-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/sp-6-osr9-12-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
30 Sep 2025
| OSR9 | Chapter 4.2
| 30 Sep 2025 | OSR9 | Chapter 4.2
An analysis of the 2023 summer and fall marine heat waves on the Newfoundland and Labrador Shelf
Nancy Soontiens
CORRESPONDING AUTHOR
Northwest Atlantic Fisheries Centre, Fisheries and Oceans Canada, St. John's, NL, A1C 5X1, Canada
Heather J. Andres
Northwest Atlantic Fisheries Centre, Fisheries and Oceans Canada, St. John's, NL, A1C 5X1, Canada
Jonathan Coyne
Northwest Atlantic Fisheries Centre, Fisheries and Oceans Canada, St. John's, NL, A1C 5X1, Canada
Frédéric Cyr
Northwest Atlantic Fisheries Centre, Fisheries and Oceans Canada, St. John's, NL, A1C 5X1, Canada
now at: Center for Fisheries and Ecosystem Research, Fisheries and Marine Institute of Memorial University of Newfoundland, St. John's, NL, Canada
Peter S. Galbraith
Institut Maurice-Lamontagne, Fisheries and Oceans Canada, Mont-Joli, QC, G5H 3Z4, Canada
Jared Penney
Northwest Atlantic Fisheries Centre, Fisheries and Oceans Canada, St. John's, NL, A1C 5X1, Canada
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Climate indices are often regarded as simple ways to relate mean environmental conditions to the state of an ecosystem. Such indices are often used to inform fisheries scientists and managers or used in fisheries resource assessments and ecosystem studies. The Newfoundland and Labrador (NL) climate index aims to describe the environmental conditions on the NL shelf and in the Northwest Atlantic as a whole. It consists of annual normalized anomalies of 10 subindices relevant for the NL shelf.
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Short summary
In this study, we explored a series of surface marine heat waves over the Newfoundland and Labrador Shelf in the summer and fall of 2023. We connected these marine heat waves to environmental conditions and found that low winds, high freshwater density, and high stratification were factors contributing to the unusually high sea surface temperature anomalies. We explored the vertical structure of temperature anomalies and found that the heat waves were confined near the surface for most of the summer.
In this study, we explored a series of surface marine heat waves over the Newfoundland and...
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