Stochastic Physics Namelist¶
General options¶
Option | Description |
---|---|
NEW_LSCALE | Recommended, set to true if use the correct calculation for decorrelation length scale. |
NTRUNC | Optional, Spectral resolution (e.g. T126) of random patterns, default is for model to determine proper truncation |
LAT_S | Optional, number of latitude points for the gaussian grid (must be even), default is for model to determine gaussian grid |
LON_S | Optional, number of longitude points for the gaussian grid (recommend 2xLAT_S, default is for model to determine gaussian grid |
STOCHINI | Optional, set to true if wanting to read in a previous random pattern |
SPPT options¶
Option | Description |
---|---|
SPPT | Amplitudes of random patterns. |
SPPT_TAU | Decorrelation timescales in seconds. |
SPPT_LSCALE | Decorrelation spatial scales in meters. |
SPPT_LOGIT | Should be true to limit the SPPT perturbations between 0 and 2. Otherwise model will crash. |
ISEED_SPPT | Seeds for setting the random number sequence (ignored if stochini is true) |
SPPT_SIGTOP1 | lower sigma level to taper perturbations to zero (default is 0.1) |
SPPT_SIGTOP2 | upper sigma level to taper perturbations to zero (default is 0.025) |
SPPT_SFCLIMIT | .T.=tapers the SPPT perturbations to zero at model’s lowest level (helps reduce model crashes) |
SPPTINT | Optional, interval in seconds to update random pattern. Perturbations still get applied every time-step |
USE_ZMTNBLCK | .T.=do not apply perturbations below the dividing streamline that is diagnosed by the gravity wave drag, mountain blocking scheme |
PERT_MP | .T.=apply SPPT perturbations to all microphysics specis. If .F. the SPPT is only applied to u,v,t,qv |
PERT_RADTEND | .T.=apply SPPT perturbations to cloudy sky radiation tendencies. If .F. then do not perturb any radiative tendencies |
PERT_CLDS | .T.=apply SPPT perturbations to fraction (only works for RRTMG radiation), if using this option set PERT_RADTEND=.F. |
SHUM options¶
Option | Description |
---|---|
SHUM | Amplitudes of random pattern. |
SHUM_TAU | Decorrelation timescales in seconds. |
SHUM_LSCALE | ecorrelation spatial scales in meters. |
SHUM_SIGEFOLD | e-folding lengthscale (in units of sigma) of specific humidity perturbations, default is 0.2) |
SHUMINT | Optional, interval in seconds to update random pattern. Perturbations still get applied every time-step |
ISEED_SHUM | Seeds for setting the random number sequence (ignored if stochini is true). |
SKEB options¶
Option | Description |
---|---|
SKEB | Amplitudes of random patterns. |
SKEB_TAU | Decorrelation timescales in seconds |
SKEB_LSCALE | Decorrelation spatial scales in meters (250) |
ISEED_SKEB | Seeds for setting the random number sequence (ignored if stochini is true). |
SKEBNORM | 0-random pattern is stream function, 1-pattern is K.E. norm, 2-pattern is vorticity (default is 0) |
SKEB_VARSPECT_OPT | 0-gaussian (default), 1-power law (not tested) |
SKEB_NPASS | number of passes of the del2 smoothing for the dissipation estimate (default is 11, minimum is 3) |
SKEB_VDOF | the number of degrees of freedom in the vertical for the SKEB random pattern (default is 5) |
SKEB_SIGTOP1 | lower sigma level to taper perturbations to zero (default is 0.1) |
SKEB_SIGTOP2 | upper sigma level to taper perturbations to zero (0.025) |
SKEBINT | Optional, interval in seconds to update random pattern. Perturbations still get applied every time-step |
SPP options¶
Option | Description |
---|---|
SPP_VAR_LIST | List of parameterizations to be perturbed. Check compns_stochy.F90 for options. |
SPP_PRT_LIST | SPP perturbation magnitudes used in each parameterization. |
SPP_TAU | Decorrelation timescales in seconds. |
SPP_LSCALE | Decorrelation spatial scales in meters. |
ISEED_SPP | Seeds for setting the random number sequence (ignored if stochini is true). |
SPP_SIGTOP1 | Lower sigma level to taper perturbations to zero (default is 0.1) |
SPP_SIGTOP2 | Upper sigma level to taper perturbations to zero (0.025) |
SPP_STDDEV_CUTOFF | Limit for possible perturbation values in standard deviations from the mean. |
Land perturbation options¶
Option | Description |
---|---|
LNDP_TYPE | 0, no perturbations. 1, old scheme (Gehne et al. 2019); 2, new scheme (Draper 2021) |
LNDP_VAR_LIST | List of land perturbations parameters. Check compns_stochy.F90 for options |
LNDP_PRT_LIST | Perturbation magnitudes used for each parameter perturbations. |
LNDP_TAU | Decorrelation timescales in seconds. |
LNDP_LSCALE | Decorrelation spatial scales in meters. |
ISEED_LNDP | Seeds for setting the random number sequence (ignored if stochini is true). |