Sensitivity Study Setup
Contents
Sensitivity Study Setup¶
Current Plan¶
Run an idealized case with the best idealized setup for all cases
If I see an improvement for these cases, see if implementing this into polar WRF would work
Idealized¶
Cases to run¶
Winter 1 - February 4, 5, and 6
Clear winter with some cloudy patches
Spring 1 - May 2, 3, and 4
Cloudy spring case
Spring 2 - May 22, 23, and 24
One clear spring day
Namelist settings¶
The following is the physics and crm sections of the namelist.input files being used for the sensitivity study.
&physics
seaice_threshold = 100,
mp_physics = 50, 50, 50,
ra_lw_physics = 3, 3, 3,
ra_sw_physics = 3, 3, 3,
radt = 1, 2, 5,
sf_sfclay_physics = 1, 91, 91,
sf_surface_physics = 1, 0, 0,
bl_pbl_physics = 0, 0, 0,
bldt = 0, 0, 0,
cu_physics = 0, 0, 0,
cudt = 5, 5, 5,
isfflx = 1,
ifsnow = 1,
icloud = 1,
num_soil_layers = 5,
mp_zero_out = 0,
ideal_xland = 2,
fractional_seaice = 0,
/
&crm
crm_zsfc = 0.0,
crm_lat = 81,
crm_lon = 8.5,
crm_stretch = 0,
crm_num_pert_layers = 33,
crm_pert_amp = 0.1,
crm_init_ccn = 100,
crm_lupar_opt = 0,
crm_znt = 0.04,
crm_emiss = 1.0,
crm_thc = 3.,
crm_mavail = 0.30,
crm_force_opt = 1,
crm_th_adv_opt = 1,
crm_qv_adv_opt = 1,
crm_th_rlx_opt = 0,
crm_qv_rlx_opt = 0,
crm_uv_rlx_opt = 1,
crm_vert_adv_opt = 1,
crm_wcpa_opt = 1,
crm_num_force_layers = 153,
crm_tau_s = 1800,
crm_tau_m = 1800,
crm_flx_opt = 0,
crm_sh_flx = 10,
crm_lh_flx = 0,
crm_albedo_opt = 1,
crm_albedo = 0.81,
crm_tsk_opt = 2,
crm_tsk = 262,
crm_ust_opt = 1,
crm_ust = 0.01,
crm_init_tke_opt = 0,
crm_init_tke = 1.0,
crm_morr_act_opt = 1,
crm_morr_hygro_opt = 0,
crm_morr_hygro = 0.12,
crm_mp_nc = 448.62,
crm_num_aer_layers = 153,
crm_stat_opt = 1,
crm_stat_sample_interval_s = 1800.,
/
Model setup¶
Change the values of the USGS section of LANDUSE.TBL from the following:
SUMMER
24, 55., .95, .95, 0.1, 5., 0., 9.0e25, ‘Snow or Ice’
WINTER
24, 70., .95, .95, 0.1, 5., 0., 9.0e25, ‘Snow or Ice’
to
SUMMER
24, 81., .95, .98, 0.001, 5., 0., 1.8e06, ‘Snow or Ice’
WINTER
24, 86., .95, .98, 0.001, 5., 0., 1.8e06, ‘Snow or Ice’
Do I need to recompile the model?
Not for modifications to the .TBL files.
I tested this by modifying the values in LANDUSE.TBL to all zero for the ‘Snow and Ice’ entry. This made the model crash as soon as it began to run, indicating that these changes did modify the model without recompilation.