Preprints
https://doi.org/10.5194/gmd-2022-23
https://doi.org/10.5194/gmd-2022-23
Submitted as: development and technical paper
08 Feb 2022
Submitted as: development and technical paper | 08 Feb 2022
Status: a revised version of this preprint was accepted for the journal GMD and is expected to appear here in due course.

Implementation and evaluation of open boundary conditions for sea ice in a regional coupled ocean (ROMS 3.7) and sea ice (CICE 5.1.2) modelling system

Pedro Duarte1, Jostein Brændshøi2, Dmitry Shcherbin1, Pauline Barras1, Jon Albretsen3, Yvonne Gusdal2, Nicholas Szapiro2, Andreas Martinsen1, Annette Samuelsen4, and Jens Boldingh Debernard2 Pedro Duarte et al.
  • 1Norwegian Polar Institute, Fram Centre, Tromsø, Norway
  • 2The Norwegian Meteorological Institute, Oslo, Norway
  • 3Institute of Marine Research, Box 1870 Nordnes, 5817 Bergen, Norway
  • 4Nansen Environmental and Remote Sensing Centre, Bergen, Norway

Abstract. The Los Alamos Sea Ice Model (CICE) is used by several Earth System Models where sea ice boundary conditions are not necessary, given their global scope. However, regional and local implementations of sea ice models require boundary conditions describing the time changes of the sea ice and snow being exchanged across the boundaries of the model domain. These boundary conditions include but are not limited to: (i) drift direction and velocity; (ii) concentration; (iii) thickness (of the ice and snow); (iv) thermodynamic conditions (with emphasis on sea ice and snow temperature or enthalpy); (v) salinity. The physical detail of these boundary conditions regarding, for example, the usage of different sea ice size categories or the vertical resolution of thermodynamic properties, must also be taken into account when matching them with the requirements of a specific implementation of a sea ice model. Available satellite products do not include all required fields described above. Therefore, the most straightforward way of getting sea ice boundary conditions is from a larger scale model. The main goal of our study is to describe and evaluate the implementation of time-varying sea ice boundaries in the CICE model using two regional coupled ocean-sea ice models, covering a large part of the Barents Sea and areas around Svalbard: the Barents-2.5 km, implemented at the Norwegian Meteorological Institute (MET), and the S4K, implemented at the Norwegian Polar Institute (NPI). We use the TOPAZ4 model and a Pan-Arctic 4 km-resolution model (A4) model to generate the boundary conditions for the sea ice and the ocean. The Barents-2.5 km model is MET Norway’s main forecasting model for ocean state and sea ice in the Barents Sea. The S4K model covers a similar domain but it is used mainly for research purposes. Obtained results show significant improvements in the performance of the Barents-2.5 km model after the implementation of the time-varying boundary conditions. The performance of the S4K model in terms of sea ice and snow thickness is comparable to that of the TOPAZ4 system but with more accurate results regarding the oceanic component. The implementation of time-varying boundary conditions described in this study is similar regardless of the CICE versions used in different models.

Pedro Duarte et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on gmd-2022-23', Anonymous Referee #1, 09 Mar 2022
    • AC1: 'Reply on RC1', Pedro Duarte, 25 Mar 2022
  • RC2: 'Comment on gmd-2022-23', Anonymous Referee #2, 28 Mar 2022
  • AC2: 'Comment on gmd-2022-23', Pedro Duarte, 10 Apr 2022

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on gmd-2022-23', Anonymous Referee #1, 09 Mar 2022
    • AC1: 'Reply on RC1', Pedro Duarte, 25 Mar 2022
  • RC2: 'Comment on gmd-2022-23', Anonymous Referee #2, 28 Mar 2022
  • AC2: 'Comment on gmd-2022-23', Pedro Duarte, 10 Apr 2022

Pedro Duarte et al.

Data sets

Sea ice satellite and model data between October 2014 and December 2015 Duarte, Pedro https://doi.org/10.5281/zenodo.5800110

Model run with METROMS to evaluate open boundary conditions in CICE [idealized wind] Brændshøi, Jostein https://zenodo.org/record/4727865#.YOMasRHis2w

Model run with METROMS to evaluate open boundary conditions in CICE Brændshøi, Jostein https://zenodo.org/record/4728069#.YOMLDhHis2w

Model code and software

metno/metroms: Version 0.4.1 Debernard, Jens; Kristensen, Nils Melsom; Maartensson, Sebastian; Wang, Keguang; Hedstrom, Kate; Brændshøi, Jostein; Szapiro, Nicholas https://zenodo.org/record/5067164#.YOMK4hHis2w

MCT, CICE and ROMS code used with for the S4K simulations Duarte, Pedro https://doi.org/10.5281/zenodo.5815093

Pedro Duarte et al.

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Short summary
Sea ice models are often implemented for very large domains beyond the regions of sea ice formation, such as the whole Arctic or the whole Antarctica. In this study we implement changes in the Los Alamos Sea Ice Model allowing it to be implemented for relatively small regions within the Arctic or the Antarctica and yet considering the presence and influence of sea ice outside the represented areas. Such regional implementations are important when spatially detailed results are required.