An analysis of the 2023 summer and fall marine heat waves on the Newfoundland and Labrador Shelf

Soontiens, Nancy; Andres, Heather J.; Coyne, Jonathan; Cyr, Frédéric; Galbraith, Peter S.; Penney, Jared

doi:https://doi.org/10.5194/sp-6-osr9-12-2025

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.

Report:

9th edition of the Copernicus Ocean State Report (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.

Articles | Volume 6-osr9

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, Heather J. Andres, Jonathan Coyne, Frédéric Cyr, Peter S. Galbraith, and Jared Penney

Supplement

https://doi.org/10.5194/sp-6-osr9-12-2025-supplement

Data sets

ERA5 hourly data on single levels from 1940 to present Copernicus Climate Change Service https://doi.org/10.24381/cds.adbb2d47

Canadian Atlantic Shelf Temperature-Salinity (CASTS) Jonathan Coyne et al. https://doi.org/10.20383/102.0739

ERA5 hourly data on single levels from 1940 to present Hans Hersbach et al. https://doi.org/10.24381/cds.adbb2d47

Global Ocean Physics Reanalysis E.U. Copernicus Marine Service Information (CMEMS) https://doi.org/10.48670/moi-00021

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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.