A step towards high resolution modeling of the central Faroe shelf circulation by FarCoast800

Sissal V. Erenbjerg, Jon Albretsen, Knud Simonsen, Anne D. Sandvik, Eigil Kaas

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Abstract

This paper describes the FarCoast800 model setup for the Faroe shelf and the validation towards
observations. We found that the circulation was in accordance with observations on the shelf and the
upper ∼500m of the water column, away from the lateral boundaries. Furthermore, we found high
correlations between the model and observations for the on-shelf water, in particular for short-term
variations of temperature, demonstrating the importance of high resolution atmospheric forcing. A
main challenge for this study was the lateral boundary conditions at all four open boundaries in the
varying and steep bathymetry of the FarCoast800 model setup. We also investigated the origin of water
reaching the different areas of the shelf. Notably our results indicated intrusion of water originating
from the East Icelandic Current into the deeper areas on the eastern part of the Faroe shelf.
Our long term motivation of the study was to investigate the capability of the model to drive
an even higher resolution ROMS model setup for the central Faroe shelf, enabling the resolution of
processes on a 100m scale or less. The study concludes that FarCoast800 can drive a high-resolution
nested model area on the Faroe shelf.
Here we present a Regional Ocean Model System (ROMS) model setup for the Faroe shelf with
a horizontal resolution of 800m x 800m and 35 vertical layers. The model setup is forced by a high
resolution atmospheric model, and forced by a 4km x 4km horizontal resolution version of the ROMS
model on the lateral boundaries. We name our model setup FarCoast800. The model setup was run
for the entire sample year 2013.
Original languageEnglish
Number of pages14
JournalRegional Studies in Marine Science
Volume40
Publication statusPublished - 2020

Keywords

  • North Atlantic
  • Faroe shelf
  • Circulation
  • Numerical modeling
  • Aquaculture

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