6.2.5. Namelist NAM_SEAICEn

Please read first 6.2.3. Sea-ice schemes

When a letter show in first column, the settings described will apply only under a given condition :

  • "G": apply if an explicit sea-ice scheme is set in PREP (e.g. GELATO)
NG Fortran name Fortran type Values Default value Units
  CINTERPOL_SIC character* ’NONE’, ’UNIF’, ’LINEAR’ ’NONE ’  
  XCD_ICE_CST float   0 (bulk)  
  LDIAG_MISC_SEAICE logical T/F T  
G XSEAICE_TSTEP float   SEA_TSTEP s
G XSI_FLX_DRV float   -20. W m-2 K-1
G XSIC_EFOLDING_TIME float   0. days
G CINTERPOL_SIT character* ’NONE’, ’UNIF’, ’LINEAR’ ’NONE ’  
G XSIT_EFOLDING_TIME float ≥0. 0. days
G XFREEZING_SST float   -1.8 Celsius


Common settings

  • CINTERPOL_SIC : Type of interpolation of Sea Ice cover external fields. This applies whatever the role of these external fields : constraint fields (when CSEAICE_SCHEME=GELATO) or forcing fields (when value is CSEAICE_SCHEME=NONE and some interpolation is set)
  • XCD_ICE_CST : Turbulent exchange coefficient value for drag, heat and vapor on sea-ice. Default is 0 and means : apply a bulk formula.
  • LDIAG_MISC_SEAICE : should we output sea-ice diagnostics ? default to T is sea-ice cover is handled

Gelato parameters

  • XSEAICE_TSTEP : Time step for the Gelato sea-ice scheme. If not set, use the same time step as the SEA scheme
  • XSI_FLX_DRV : Derivative of the non-solar fluxes w.r.t. sea-ice temperature; allows Gelato to compute this flux on various ice categories, as long as Surfex handles only one sea-ice category.
  • XSIC_EFOLDING_TIME: If >0, a damping of sea-ice cover will occur in Gelato, with this e-folding time. The sea-ice cover constraint is the data provided in the PREP file, interpolated in time according to CINTERPOL_SIC setting, or, as a default, the interpretation of SST data using XFREEZING_SST. [ note for Gelato wizzards : the Surfex default Gelato option for damping is "MONO" ]
  • CINTERPOL_SIT : Type of interpolation of Sea Ice thickness constraint, in Gelato.
  • XSIT_EFOLDING_TIME : If >0, a damping of sea-ice thickness will occur in Gelato, with this e-folding time. The sea-ice thickness constraint is the data provided in the PREP file [ note for Gelato wizzards : the Surfex default Gelato option for damping is "MONO_ADD" ]
  • XFREEZING_SST : Arbitrary SST freezing point . Indicates where the SST data you provide can be interpreted by Gelato as locations covered with sea-ice, if no SIC constraint field is provided. SST passed to Gelato will also anyway then be set there to the actual, salinity-dependant, freezing point.

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