NAM_SURF_SNOW_CSTS

NAM_SURF_SNOW_CSTS content

Fortran name

Fortran type

Default value

XZ0ICEZ0SNOW

REAL

XRHOTHRESHOLD_ICE

REAL

XALBICE1

REAL

0.38

XALBICE2

REAL

0.23

XALBICE3

REAL

0.08

XVAGING_NOGLACIER

REAL

XVAGING_GLACIER

REAL

XPERCENTAGEPORE

REAL

0.05

XPERCENTAGEPORE_FRZ

REAL

1.0

XVVISC3

REAL

0.023

X_RI_MAX

REAL

0.20

XIMPUR_WET

REAL, DIMENSION(5)

0.,0.,0.,0.,0.

XIMPUR_DRY

REAL, DIMENSION(5)

0.,0.,0.,0.,0.

XPSR_SNOWMAK

REAL

0.0012

XRHO_SNOWMAK

REAL

600

XPTA_SEUIL

REAL

268

XPR_A

REAL

XPR_B

REAL

XPT

REAL

XPP_D1

REAL

XPP_D2

REAL

XPP_D3

REAL

XPP_H1

REAL

XPP_H2

REAL

XPP_H3

REAL

XPP_H4

REAL

XWT

REAL

XPTR

REAL

XPROD_SCHEME

REAL, DIMENSION(5)

2500, 5000, 4000, 2500, 1000

XSM_END

REAL, DIMENSION(4)

4, 15, 4, 15

XFREQ_GRO

INTEGER

1

XSCAVEN_COEF

REAL, DIMENSION(5)

0.,0.,0.,0.,0.

XAGELIMPAPPUS

REAL

0.05

XWINDTHRFRESH

REAL

6.0

XRHODEPPAPPUS

REAL

250

XDIAMDEPPAPPUS

REAL

0.0003

XSPHDEPPAPPUS

REAL

1.0

XLFETCHPAPPUS

REAL

250

XAGELIMPAPPUS2

REAL

0.05

XDEMAXVFALL

REAL

0.3

XCROCOEF_FF

REAL

1.0

  • XZ0ICEZ0SNOW : roughness length ratio between ice and snow

  • XRHOTHRESHOLD_ICE : density threshold for ice detection in CROCUS scheme (kg.m$^{-3}$)

  • XALBICE1, XALBICE2, XALBICE3 : prescribed ice albedo in 3 spectral bands for glacier simulation with CROCUS scheme

  • XVAGING_NOGLACIER, XVAGING_GLACIER : for ageing effects

  • XPERCENTAGEPORE : percentage of the total pore volume to compute the max liquid water holding capacity

  • XPERCENTAGEPORE_FRZ :

  • XVVISC3 : density adjustement in the exponential correction for viscosity (in m$^{3}$.kg$^{-1}$)

  • XIMPUR_WET : corresponds to the initial amount of Light-Absorbing Particles (LAP) present in the falling snow

  • XIMPUR_DRY : corresponds to the dry deposition coefficient (always activated) at top of snowpack (in g/m$^{2}$/s) for black carbon (XIMPUR_DRY(1)), dust (XIMPUR_DRY(2)), and other types of impurities (XIMPUR_DRY(3:5))

  • XPSR_SNOWMAK : Machine-made snow precipitation rate (in kg/m$^{2}$/s)

  • XRHO_SNOWMAK : Machine-made snow density (kg/m$^{3}$)

  • XPTA_SEUIL : Wet but temperature threshold for machine-made snow production (K)

  • XPR_A : Adjustable coefficients depending on snow-gun type (Hanzer et al., 2014). Recommended value= -3.94

  • XPR_B : Adjustable coefficients depending on snow-gun type (Hanzer et al., 2014). Recommended value= -4.23

  • XPT : Water consumption threshold during base-layer generation production period (kg/m$^{2}$). Recommended value = 150

  • XPP_D1 : Day of beginning (from 1$^{st}$ of December, with 31 days for all months) of base-layer generation production period (recommended value 1$^{st}$ of November=11*31+1=342). For CROCUS resort only.

  • XPP_D2 : Day of end (from 1$^{st}$ of December, with 31 days for all months) of base-layer generation production period (recommended value 15$^{th}$ of December=12*31+15=387). For CROCUS resort only.

  • XPP_D3 : Day of end (from 1$^{st}$ of December, with 31 days for all months) of reinforcement production period (recommended value 31$^{th}$ of March=3*31+31=124). For CROCUS resort only.

  • XPP_H1 : Hour of beginning of base-layer generation production period (in seconds, from midnight). Production during this period is allowed all day (0s to 86400s). For CROCUS resort only.

  • XPP_H2 : Hour of end of base-layer generation production period (in seconds, from midnight). Production during this period is allowed all day (0s to 86400s). For CROCUS resort only.

  • XPP_H3 : Hour of beginning of reinforcement production period (in seconds, from midnight). Production during this period is allowed from 6pm (64800s) to 8am (28800s). For CROCUS resort only.

  • XPP_H4 : Hour of end of reinforcement production period (in seconds, from midnight). Production during this period is allowed from 6pm (64800s) to 8am (28800s). For CROCUS resort only.

  • XWT : Wind speed threshold for snowmaking (m/s). Recommended value = 4.2

  • XPTR : Total (natural+machine-made) snow height threshold during reinforcement production period (m). Recommended value = 0.6

  • XPROD_SCHEME : Snow production by machines in Crocus-RESORT. When LSELF_PROD=F, the production is forced to match to production scheme defined by XPROD_SCHEME. For Nov, Dec, Jan, Feb and Mar, every day at 18:00, a production counter is compared to the target. If it’s lower, the production is allowed.

  • XSM_END : Month and day to stop grooming in Crocus-RESORT. (for LSNOWMAK_BOOL = F and for LSNOWMAK_BOOL = T, respectively)

  • XFREQ_GRO : Grooming frequency (usually 1/day)

  • XSCAVEN_COEF : percentage of impurity leaving with percolating water, for black carbon (XSCAVEN_COEF(1)), dust (XSCAVEN_COEF(2)), and other types of impurities (XSCAVEN_COEF(3:5))

  • XAGELIMPAPPUS : maximum age (days) of snow layer for which wind speed threshold is set to fresh threshold wind speed

  • XWINDTHRFRESH : 5m wind speed threshold for transport of freshly fallen (or deposited) snow

  • XRHODEPPAPPUS : density (kg.m$^{-3}$) of wind blown deposited snow

  • XDIAMDEPPAPPUS : optical diameter (m) of wind blown deposited snow

  • XSPHDEPPAPPUS : sphericity of wind blown deposited snow

  • XLFETCHPAPPUS : constant fetch distance applied to all points for snowpappus blowing snow flux calculation (m)

  • XAGELIMPAPPUS2 : maximum age (in days) of snow for using Naaim96 formulation of terminall fall speed in snowpappus

  • XDEMAXVFALL : maximum dendricity to have pure young snow fall speed, when option MIXT is chosen for terminal fall speed calculation (CLIMVFALL=’MIXT’ in NAM_ISBA_SNOW)

  • XCROCOEF_FF : to have the possibility to change the coefficient for gust diagnosis from average wind (ie to have XCOEF_FF value outside of Crocus and XCROCOEF_FF inside Crocus)