4.1.2. Namelist NAM_ISBA

Fortran name Fortran type values default value
NPATCH integer between 1 and 19 1
CISBA character (LEN=3) '2-L', '3-L', 'DIF' '3-L'
CPHOTO string of 3 characters 'NON', 'AST', 'NIT', 'NCB' 'NON'
LTR_ML logical F
XRM_PATCH real > 0. and < 1. 0.
CPEDO_FUNCTION string of 4 characters 'CH78', 'C084' 'CH78'
NGROUND_LAYER integer >0 1E+9
XUNIF_CLAY real between 0 and 1 0.33
YCLAY character (LEN=28) ' '
YCLAYFILETYPE character (LEN=6) 'DIRECT', 'BINLLF','BINLLV', 'ASCLLV' none
XUNIF_SAND real between 0 and 1 0.33
YSAND character (LEN=28) ' '
YSANDFILETYPE character (LEN=6) 'DIRECT', 'BINLLF','BINLLV', 'ASCLLV' none
XUNIF_RUNOFFB real 0.5
YRUNOFFB character (LEN=28) ' '
YRUNOFFBFILETYPE character (LEN=6) 'DIRECT', 'BINLLF','BINLLV', 'ASCLLV' none
XUNIF_WDRAIN real 0.
YWDRAIN character (LEN=28) ' '
YWDRAINFILETYPE character (LEN=6) 'DIRECT', 'BINLLF','BINLLV', 'ASCLLV' none
YCTI character (LEN=28) ' '
YCTIFILETYPE character (LEN=6) 'DIRECT' none
XUNIF_SOC_TOP real 1.E+20
XUNIF_SOC_SUB real 1.E+20
YSOC_TOP character (LEN=28) ' '
YSOC_SUB character (LEN=28) ' '
YSOCFILETYPE character (LEN=6) 'DIRECT', 'BINLLF','BINLLV', 'ASCLLV' none
XUNIF_PERM real 1.E+20
YPERM character (LEN=28) ' '
YPERMFILETYPE character (LEN=28) ' '
XUNIF_PH real 1.E+20
YPH character (LEN=28) ' '
YPHFILETYPE character (LEN=28) ' '
XUNIF_FERT real 1.E+20
YFERT character (LEN=28) ' '
YFERTFILETYPE character (LEN=28) ' '
LIMP_SAND logical F
LIMP_CLAY logical F
LIMP_CTI logical F
LIMP_SOC logical F
LIMP_PERM logical F
XSOILGRID real(150) 1.E+20
CALBEDO string of 4 characters 'MEAN', 'DRY ', 'WET ', 'EVOL','CM13' 'DRY '
LMEB logical .FALSE.

  • NPATCH : number of patches used in ISBA. One patch corresponds to aggregated parameters. 12 patches correspond to separate energy budgets for all vegetation types present in ISBA. 3 patches correspond to bare soil types, low vegetation, trees. If CPHOTO equals 'NON' any number of patches between 1 and 12 is possible, for the other values of CPHOTO, 12 patches are required. The order and the signification of each patch is the following:
    • 1: no vegetation (smooth) - NO
    • 2: no vegetation (rocks) - ROCK
    • 3: permanent snow and ice - SNOW
    • 4: temperate broadleaf cold-deciduous summergreen - TEBD (TREE)
    • 5: boreal needleleaf evergreen - BONE (CONI)
    • 6: tropical broadleaf evergreen - EVER
    • 7: C3 cultures types - C3
    • 8: C4 cultures types - C4
    • 9: irrigated crops - IRR
    • 10: grassland (C3) - GRAS
    • 11: tropical grassland (C4) - TROG
    • 12: peat bogs, parks and gardens (irrigated grass) - PARK
    • 13: tropical broadleaf deciduous - TRBD (TREE)
    • 14: temperate broadleaf evergreen - TEBE (TREE)
    • 15: temperate needleleaf evergreen - TENE (CONI)
    • 16: boreal broadleaf cold-deciduous summergreen - BOBD (TREE)
    • 17: boreal needleleaf cold-deciduous summergreen - BOND (CONI)
    • 18: boreal grass - BOGR (GRASS)
    • 19: shrub - SHRB (TREE)
  • CISBA: type of soil discretization and physics in ISBA:
    • '2-L' : force-restore method with 2 layers for hydrology
    • '3-L' : force-restore method with 3 layers for hydrology
    • 'DIF' : diffusion layer, with any number of layers
  • CPHOTO:type of photosynthesis physics. The following options are currently available:
    • "NON" : none is used. Jarvis formula is used for plant transpiration.
    • "AST" : ISBA-AGS with offensive/defensive stress, without evolving Leaf Area Index
    • "NIT" : ISBA-AGS with nitrogen, with evolving Leaf Area Index
    • "NCB" : ISBA-AGS with nitrogen, with evolving Leaf Area Index and wood, soil, roots biomass
  • LTR_ML: to activate new radiative transfert calculation, only if CPHOTO/=NON.
  • XRM_PATCH : threshol to remove little fractions of patches
  • CPEDO_FUNCTION: Pedo-transfert function for DIF. The following options are currently available:
    • "CH78" : Clapp and Hornberger 1978 for BC
    • "C084" : Cosby et al. 1988 for BC
  • NGROUND_LAYER : number of soil layer used in case of diffusion physics in the soil (CISBA = 'DIF'):
    • with CISBA = 2-L, NGROUND_LAYER default is 2
    • with CISBA = 3-L, NGROUND_LAYER default is 3
    • with CISBA= DIF and LECOCLIMAP, NGROUND_LAYER default is 14
  • XUNIF_CLAY : uniform prescribed value of clay fraction.
  • YCLAY: clay fraction data file name.
  • YCLAYFILETYPE: type of clay data file ('DIRECT', 'BINLLF', 'BINLLV', 'ASCLLV')
  • XUNIF_SAND : uniform prescribed value of sand fraction.
  • YSAND: sand fraction data file name.
  • YSANDFILETYPE: type of sand data file ('DIRECT', 'BINLLF', 'BINLLV', 'ASCLLV')
  • XUNIF_RUNOFFB: uniform prescribed value of subgrid runoff coefficient.
  • YRUNOFFB: subgrid runoff coefficient data file name.
  • YRUNOFFBFILETYPE: type of subgrid runoff data file ('DIRECT', 'BINLLF', 'BINLLV', 'ASCLLV')
  • XUNIF_WDRAIN: uniform prescribed value of subgrid drainage.
  • YWDRAIN: subgrid drainage data file name.
  • YWDRAINFILETYPE: type of subgrid drainage data file ('DIRECT', 'BINLLF', 'BINLLV', 'ASCLLV')
  • YCTI: topographic indices file name.
  • YCTIFILETYPE: type of topographic file ('DIRECT', 'BINLLF', 'BINLLV', 'ASCLLV')
  • XUNIF_SOC_TOP: uniform prescribed value of topsoil organic carbon (used only in CSOC=SGH in NAM_ISBAn)
  • XUNIF_SOC_SUB: uniform prescribed value of subsoil organic carbon (used only in CSOC=SGH in NAM_ISBAn)
  • YSOC_TOP: organic carbon topsoil data file name (used only in CSOC=SGH in NAM_ISBAn).
  • YSOC_SUB: organic carbon subsoil data file name (used only in CSOC=SGH in NAM_ISBAn).
  • YSOCFILETYPE: type of organic matter data file ('DIRECT', 'BINLLF', 'BINLLV', 'ASCLLV') (used only in CSOC=SGH in NAM_ISBAn)
  • XUNIF_PERM : uniform value of permafrost distribution (used only if CISBA=DIF)
  • YPERM: file name for permafrost distribution (used only if CISBA=DIF)
  • YPERMFILETYPE: permafrost distribution data file type('DIRECT', 'BINLLF', 'BINLLV', 'ASCLLV') (used only if CISBA=DIF)
  • XUNIF_PH : uniform value of soil pH (used only if LCH_NO_FLUX=T)
  • YPH: file name for soil pH (used only if LCH_NO_FLUX=T)
  • YPHFILETYPE: soil pH data file type ('DIRECT', 'BINLLF', 'BINLLV', 'ASCLLV') (used only if LCH_NO_FLUX=T)
  • XUNIF_FERT : uniform value of soil fertilization rate (kgN/ha/h) (used only if LCH_NO_FLUX=T)
  • YFERT: file name for soil fertilisation rate (kgN/ha/h) (used only if LCH_NO_FLUX=T)
  • YFERTFILETYPE: soil fertilisation rate file type (kgN/ha/h)('DIRECT', 'BINLLF', 'BINLLV', 'ASCLLV') (used only if LCH_NO_FLUX=T)
  • LIMP_SAND: reads sand fraction in an existing PGD file
  • LIMP_CLAY: reads clay fraction in an existing PGD file
  • LIMP_CTI: reads topographic indices in an existing PGD file
  • LIMP_SOC: reads organic carbon in an existing PGD file
  • LIMP_PERM: reads permafrost distribution in an existing PGD file
  • XSOILGRID: uniform soil depth grid for CISBA=DIF. Default with CISBA=DIF and LECOCLIMAP is (/0.01,0.04,0.10,0.20,0.40,0.60,0.80,1.00,1.50,2.00,3.00,5.00,8.00,12.0/)
  • CALBEDO: type of bare soil albedo. The following options are currently available:
    • "DRY " : dry bare soil albedo
    • "WET " : wet bare soil albedo
    • "MEAN" : albedo for bare soil half wet, half dry
    • "EVOL" : albedo of bare soil evolving with soil humidity
    • "CM13" : albedo by cover and vegetation type processed from satellite data
  • LMEB: Flag to activate MEB (please note that by default, MEB uses the TR_LM radiation scheme, so when LMEB=T, LTR_ML=T automatically)

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