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https://doi.org/10.5194/egusphere-2025-3986
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/egusphere-2025-3986
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Preprints
10 Sep 2025
 | 10 Sep 2025
Status: this preprint is open for discussion and under review for Geoscientific Model Development (GMD).

"Norkyst" version 3: the coastal ocean forecasting system for Norway

Kai Håkon Christensen, Jon Albretsen, Lars Asplin, Håvard Guldbrandsen Frøysa, Yvonne Gusdal, Silje Christine Iversen, Mari Fjalstad Jensen, Ingrid Askeland Johnsen, Nils Melsom Kristensen, Pål Næverlid Sævik, Anne Dagrun Sandvik, Magne Simonsen, Jofrid Skarðhamar, Ann Kristin Sperrevik, and Marta Trodahl

Abstract. We describe the operational forecasting system "Norkyst", now in version 3, which is used for predicting the ocean circulation along the coast of mainland Norway and in the fjords. The forecasting system is based on the Regional Ocean Modeling System (ROMS), and has sub-kilometric horisontal resolution to resolve mesoscale features. Here we describe the basic configuration and report verification statistics of unconstrained model runs. The main features of the circulation and hydrography, including seasonal variations, are well represented in Norkyst v.3, making the forecast system suitable for its intended use as an open service for users in public or private sectors such as aquaculture, fishery, shipping, research, consulting, environmental management, and others who needs detailed predictions of the physical state of the Norwegian coastal ocean.

How to cite. Christensen, K. H., Albretsen, J., Asplin, L., Guldbrandsen Frøysa, H., Gusdal, Y., Iversen, S. C., Fjalstad Jensen, M., Askeland Johnsen, I., Melsom Kristensen, N., Næverlid Sævik, P., Sandvik, A. D., Simonsen, M., Skarðhamar, J., Sperrevik, A. K., and Trodahl, M.: "Norkyst" version 3: the coastal ocean forecasting system for Norway, EGUsphere [preprint], https://doi.org/10.5194/egusphere-2025-3986, 2025.
Received: 15 Aug 2025 – Discussion started: 10 Sep 2025
Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this paper. While Copernicus Publications makes every effort to include appropriate place names, the final responsibility lies with the authors. Views expressed in the text are those of the authors and do not necessarily reflect the views of the publisher.
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Kai Håkon Christensen, Jon Albretsen, Lars Asplin, Håvard Guldbrandsen Frøysa, Yvonne Gusdal, Silje Christine Iversen, Mari Fjalstad Jensen, Ingrid Askeland Johnsen, Nils Melsom Kristensen, Pål Næverlid Sævik, Anne Dagrun Sandvik, Magne Simonsen, Jofrid Skarðhamar, Ann Kristin Sperrevik, and Marta Trodahl

Status: open (until 05 Nov 2025)

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Kai Håkon Christensen, Jon Albretsen, Lars Asplin, Håvard Guldbrandsen Frøysa, Yvonne Gusdal, Silje Christine Iversen, Mari Fjalstad Jensen, Ingrid Askeland Johnsen, Nils Melsom Kristensen, Pål Næverlid Sævik, Anne Dagrun Sandvik, Magne Simonsen, Jofrid Skarðhamar, Ann Kristin Sperrevik, and Marta Trodahl

Data sets

Hindcast archive K. H. Christensen et al. https://thredds.met.no/thredds/catalog/romshindcast/norkyst_v3/catalog.html

Daily forecasts K. H. Christensen et al. https://thredds.met.no/thredds/fou-hi/norkystv3.html

Model code and software

Norkyst v. 3 input files K. H. Christensen et al. https://zenodo.org/records/16810677

Interactive computing environment

Analysis and plotting scripts K. H. Christensen et al. https://doi.org/10.5281/zenodo.17053759

Kai Håkon Christensen, Jon Albretsen, Lars Asplin, Håvard Guldbrandsen Frøysa, Yvonne Gusdal, Silje Christine Iversen, Mari Fjalstad Jensen, Ingrid Askeland Johnsen, Nils Melsom Kristensen, Pål Næverlid Sævik, Anne Dagrun Sandvik, Magne Simonsen, Jofrid Skarðhamar, Ann Kristin Sperrevik, and Marta Trodahl

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Short summary
This paper describes "Norkyst", the operational coastal ocean forecasting system for mainland Norway, which is now in version 3. The system produces five day forecasts of ocean currents, temperature, salinity, and sea surface height every day, and we also maintain an archive of historical data going back to 2012. We show that the outputs of Norkyst have sufficient quality so that it's intended use as a free public service supporting scientists, ocean managers, and industry is justified.
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