NAM_ISBAn

Warning

This namelist comes from SURFEX 9.0.0 user guide https://www.umr-cnrm.fr/surfex/IMG/pdf/surfex_tecdoc.pdf.

NAM_ISBAn content

Fortran name	Fortran type	Default value
CC1DRY	CHARACTER(LEN=4)	‘DEF’
CSCOND	CHARACTER(LEN=4)	‘PL98’
CSOILFRZ	CHARACTER(LEN=3)	‘DEF’
CDIFSFCOND	CHARACTER(LEN=4)	‘DEF’
CSNOWRES	CHARACTER(LEN=3)	‘DEF’
CCPSURF	CHARACTER(LEN=3)	‘DRY’
CZ0HEAT	CHARACTER(LEN=3)	‘DEF’
XTSTEP	REAL	none
XCVHEATF	REAL	0.20
XCGMAX	REAL	2.E-5
XCDRAG	REAL	0.15
XZ0HEAT	REAL	0.0
LGLACIER	LOGICAL	.FALSE.
LCANOPY_DRAG	LOGICAL	.FALSE.
LVEGUPD	LOGICAL	.TRUE.
LPERTSURF	LOGICAL	.TRUE.

• 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

  • ‘M98’ : Martin et Lejeune 1998: older computation for turbulent fluxes coefficents in Crocus

• CZ0HEAT : roughness length for heat

• 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.

• XTSTEP : time step for ISBA. Default is to use the time-step given by the atmospheric coupling (seconds).

• XCVHEATF : Modify Cv to compensate biases in ground temperature

• XCGMAX : maximum value for soil heat capacity.

• XCDRAG : drag coefficient in canopy.

• XZ0HEAT : factor to calculate Z0H when CZ0HEAT=”Z95”

• 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

• LCANOPY_DRAG : drag activated in SBL scheme within the canopy

• LVEGUPD : True = update vegetation parameters every decade

• LPERTSURF : if T modification of surface fluxes for ensemble forecasting