6.5.2. Namelist NAM_ISBAn

Fortran name Fortran type values default value
CC1DRY string of 4 characters 'DEF ', 'GB93' 'DEF '
CSCOND string of 4 characters 'NP89', 'PL98' 'PL98'
CSOILFRZ string of 3 characters 'DEF', 'LWT' 'DEF'
CDIFSFCOND string of 4 characters 'DEF ', 'MLCH' 'DEF '
CSNOWRES string of 3 characters 'DEF', 'RIL' 'DEF'
CCPSURF string of 3 characters 'DRY ', 'HUM' 'DRY '
LCANOPY_DRAG logical .FALSE.
LGLACIER logical .FALSE.
XTSTEP real none
XCGMAX real 2.E-5
XCDRAG real 0.15
LVEGUPD logical T
LPERTSURF logical T

  • CC1DRY: type of C1 formulation for dry soils. The following options are currently available:
    • "DEF " : Giard-Bazile formulation
    • "GB93" : Giordani 1993, Braud 1993
  • CSCOND: type of thermal conductivity. The following options are currently available:
    • "NP89" : Noilhan and Planton (1989) formula
    • "PL98" : Peters-Lidard et al. (1998) formula
  • CSOILFRZ: type of soil freezing-physics option. The following options are currently available:
    • "DEF" : Boone et al. 2000; Giard and Bazile 2000
    • "LWT" : Phase changes as above, but relation between unfrozen water and temperature considered
  • CDIFSFCOND: type of Mulch effects. The following options are currently available:
    • "DEF " : no mulch effect
    • "MLCH" : include the insulating effect of leaf litter/mulch on the surf. thermal cond.
  • CSNOWRES: type of turbulent exchanges over snow. The following options are currently available:
    • "DEF" : Louis
    • "RIL" : Maximum Richardson number limit for stable conditions ISBA-SNOW3L turbulent exchange option
  • CCPSURF: type of specific heat at surface. The following options are currently available:
    • "DRY" : specific heat does not depend on humidity at surface
    • "HUM" : specific heat depends on humidity at surface.
  • LCANOPY_DRAG: drag activated in SBL scheme within the canopy
  • LGLACIER: If activated, specific treatment (as in Arpege) over permanent snow/ice regions. Snow depth initialised to 10m and soil ice to porosity. During the run, snow albedo ranges from 0.8 to 0.85
  • XTSTEP: time step for ISBA. Default is to use the time-step given by the atmospheric coupling (seconds).
  • XCGMAX: maximum value for soil heat capacity.
  • XCDRAG: drag coefficient in canopy.
  • LVEGUPD: True = update vegetation parameters every decade
  • LPERTSURF: if .True. modification of surface fluxes for ensemble forecasting

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