Marta Trodahl

• Trodahl, Marta; Isachsen, Pål Erik; Lilly, Jonathan M.; Nilsson, Johan & Kristensen, Nils Melsom (2020). The regeneration of the lofoten vortex through vertical alignment. Journal of Physical Oceanography. ISSN 0022-3670. 50(9), s. 2689–2711. doi: 10.1175/JPO-D-20-0029.1.
• Dugstad, Johannes Sandang; Fer, Ilker; Lacasce, Joseph Henry; Sanchez de la Lama, Marta & Trodahl, Marta (2019). Lateral Heat Transport in the Lofoten Basin: Near-Surface Pathways and Subsurface Exchange. Journal of Geophysical Research (JGR): Oceans. ISSN 2169-9275. 124(5), s. 2992–3006. doi: 10.1029/2018JC014774. Fulltekst i vitenarkiv
• Trodahl, Marta & Isachsen, Pål Erik (2018). Topographic influence on baroclinic instability and the mesoscale eddy field in the northern North Atlantic Ocean and the Nordic Seas. Journal of Physical Oceanography. ISSN 0022-3670. 48(11), s. 2593–2607. doi: 10.1175/JPO-D-17-0220.1. Fulltekst i vitenarkiv

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• Melsom, Arne & Trodahl, Marta (2016). Impact of open boundary conditions on NorKyst-800m results.
• Gusdal, Yvonne; Melsom, Arne; Trodahl, Marta; Kvile, Kristina Øie & Langangen, Øystein (2016). Changes in drift pathways of fish egg along the coast of Norway.
• Melsom, Arne & Trodahl, Marta (2016). Evaluation of open boundary conditions in ROMS. Norwegian Meteorological Institute. ISSN 2387-4201. Vis sammendrag

  Results from the operational model for ocean circulation in Norwegian coastal waters, NorKyst-800m, have been compiled on a daily basis since 2012-06-27. The results for salinity and temperature have been compared to cruise data that are available from the Institute of Marine Research (Norway). Generally, the results have a slight cold bias of a few tenths of a degree, and a strong, positive salinity bias of 0.5 – 2 PSU. The purpose of the present study is to examine the role of open boundary conditions (OBCs) for the biases, with a focus on the salinity bias. A set of three 1-year long experiments have been run, differing in the choice of OBCs. We find that the various experiments give contrasting results for salinity, but also to some degree the ocean temperature distribution and the eddy kinetic energy. We conclude that using OBCs from a different source than in the present operational set-up will likely improve the quality of the model results. Our recommendation is that an alternative configuration to today’s operational NorKyst-800m is implemented and run in parallel. When the new implementation is stable and is found to exhibit the improvements that are reported here, this implementation should be the base for future development of the NorKyst-800m configuration. At some point, a complete substitution of today’s operational configuration with the recommended alternative should also be considered.

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