Submitted as: model evaluation paper 07 May 2021

Submitted as: model evaluation paper | 07 May 2021

Review status: this preprint is currently under review for the journal GMD.

Assessment of the Finite VolumE Sea Ice Ocean Model (FESOM2.0), Part II: Partial bottom cells, embedded sea ice and vertical mixing library CVMIX

Patrick Scholz1, Dmitry Sidorenko1, Sergey Danilov1,2, Qiang Wang1, Nikolay Koldunov1, Dmitry Sein1,4, and Thomas Jung1,3 Patrick Scholz et al.
  • 1Alfred Wegener Institute Helmholtz Center for Polar and Marine Research (AWI), Bremerhaven, Germany
  • 2Jacobs University Bremen, Department of Mathematics & Logistics, Bremen, Germany
  • 3University of Bremen, Department of Physics and Electrical Engineering, Bremen, Germany
  • 4Shirshov Institute of Oceanology, Russian Academy of Science, 36 Nahimovskiy Prospect, Moscow, Russia 117997

Abstract. The second part of the assessment and evaluation of the unstructured-mesh Finite-volumE Sea ice-Ocean Model version 2.0 (FESOM2.0) is presented. It focuses on the performance of partial cells, embedded sea ice and on the effect of mixing parameterisations available through the CVMIX package.

It is shown that partial cells and embedded sea ice lead to significant improvements in the representation of the Gulf Stream and North Atlantic Current as well as the circulation of the Arctic Ocean. In addition to the already existing Pacanowski and Phillander (fesom_PP) and K-profile (fesom_KPP) parameterisations for vertical mixing in FESOM2.0, we document the impact of several mixing parameterisations from the Community Vertical Mixing (CVMIX) project library. Among them are the CVMIX versions of Pacanowski and Phillander (cvmix_PP) and K-profile (cvmix_KPP) parameterisations, the tidal mixing parameterisation (cvmix_TIDAL), a vertical mixing parameterisation based on turbulent kinetic energy (cvmix_TKE) as well as a combination of cvmix_TKE and the recent scheme for the computation of the Internal Wave Dissipation, Energy and Mixing (IDEMIX). The IDEMIX parameterises the redistribution of internal wave energy through wave propagation, nonlinear interactions and the associated imprint on the vertical background diffusivity. Further, the benefit from using a parameterisation of sea ice melt season mixing in the surface layer (MOMIX) for reducing Southern Ocean hydrographic biases in FESOM2.0 is presented. We document the implementation of different model components and illustrate their behaviour. This paper serves primarily as a reference for FESOM users but is also useful to the broader modelling community.

Patrick Scholz et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC2: 'Comment on gmd-2021-94', Anonymous Referee #2, 26 Jul 2021
  • RC3: 'Comment on gmd-2021-94', Luke Van Roekel, 29 Jul 2021

Patrick Scholz et al.

Patrick Scholz et al.


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Short summary
Structured-mesh ocean models are still more mature in terms of functionality due to their long development history. However, also the unstructured-mesh ocean models acquire new features and catch up in their functionality. This paper continues the work by Scholz et al. (2019) in documenting the features available in FESOM2.0. It focuses on two aspects: (1) is partial bottom cells and embedded sea ice, (2) deals with mixing parameterizations enabled through the use of the CVMIX package.