Hello everyone!
When I run wrf.exe (Version 4.3.2) with gwd_opt equals to 3 in namelist.input, all the relevant diagnostic variables are zero, and the wind fields of all three domains (25km, 5km, and 1km)are exactly the same with gwd_opt equals to 0.
According to the users' guide, gwd_opt equals to 3 indicates all four drag parameterization schemes (large-scale gravity wave drag, small-scale gravity wave drag, blocking drag, topographic form drag) are used in wrf.exe, and gwd_opt equals to 0 indicates no drag parameterization schemes. The result seems quite strange since the parameterization schemes should have effected the wind field obviously, especially to the surface layers. Here follows the namelist.input.
&domains
time_step = 100,
time_step_fract_num = 0,
time_step_fract_den = 1,
max_dom = 3,
e_we = 80, 221, 601,
e_sn = 80, 231, 651,
e_vert = 51, 51, 51
p_top_requested = 3000,
num_metgrid_levels = 34,
num_metgrid_soil_levels = 4,
dx = 25000, 5000, 1000
dy = 25000, 5000, 1000
grid_id = 1, 2, 3,
parent_id = 1, 1, 2,
i_parent_start = 1, 20, 55,
j_parent_start = 3, 25, 47,
parent_grid_ratio = 1, 5, 5,
parent_time_step_ratio = 1, 5, 5,
feedback = 1,
smooth_option = 2
/
&physics
mp_physics = 8, 8, 8,
ra_lw_physics = 4, 4, 4,
ra_sw_physics = 4, 4, 4,
radt = 30, 30, 30,
sf_sfclay_physics = 1, 1, 1,
sf_surface_physics = 2, 2, 2,
bl_pbl_physics = 1, 1, 1,
topo_wind = 0, 0, 0,
bldt = 0, 0, 0,
cu_physics = 1, 0, 0,
cudt = 5, 0, 0,
isfflx = 1,
ifsnow = 1,
icloud = 1,
surface_input_source = 1,
num_soil_layers = 4,
num_land_cat = 21,
sf_urban_physics = 0, 0, 0,
/
&dynamics
hybrid_opt = 0,
w_damping = 1,
diff_opt = 1, 1, 1,
km_opt = 4, 4, 4,
diff_6th_opt = 0, 0, 0,
diff_6th_factor = 0.12, 0.12, 0.12,
base_temp = 290.
damp_opt = 0,
zdamp = 5000., 5000., 5000.,
dampcoef = 0.2, 0.2, 0.2
khdif = 0, 0, 0,
kvdif = 0, 0, 0,
non_hydrostatic = .true., .true., .true.,
moist_adv_opt = 1, 1, 1,
scalar_adv_opt = 1, 1, 1,
gwd_opt = 3
gwd_diags = 1
/
&bdy_control
spec_bdy_width = 7,
spec_zone = 1,
relax_zone = 6,
specified = .true., .false.,.false.,
nested = .false., .true., .true.,
/
&grib2
/
&namelist_quilt
poll_servers = T,
nio_tasks_per_group = 0,
nio_groups = 1,
/
My problem is how to turn on the gwd_opt and are there any other steps to use the drag parameterization schemes appropriately in wrf.exe?
Thanks.
When I run wrf.exe (Version 4.3.2) with gwd_opt equals to 3 in namelist.input, all the relevant diagnostic variables are zero, and the wind fields of all three domains (25km, 5km, and 1km)are exactly the same with gwd_opt equals to 0.
According to the users' guide, gwd_opt equals to 3 indicates all four drag parameterization schemes (large-scale gravity wave drag, small-scale gravity wave drag, blocking drag, topographic form drag) are used in wrf.exe, and gwd_opt equals to 0 indicates no drag parameterization schemes. The result seems quite strange since the parameterization schemes should have effected the wind field obviously, especially to the surface layers. Here follows the namelist.input.
&domains
time_step = 100,
time_step_fract_num = 0,
time_step_fract_den = 1,
max_dom = 3,
e_we = 80, 221, 601,
e_sn = 80, 231, 651,
e_vert = 51, 51, 51
p_top_requested = 3000,
num_metgrid_levels = 34,
num_metgrid_soil_levels = 4,
dx = 25000, 5000, 1000
dy = 25000, 5000, 1000
grid_id = 1, 2, 3,
parent_id = 1, 1, 2,
i_parent_start = 1, 20, 55,
j_parent_start = 3, 25, 47,
parent_grid_ratio = 1, 5, 5,
parent_time_step_ratio = 1, 5, 5,
feedback = 1,
smooth_option = 2
/
&physics
mp_physics = 8, 8, 8,
ra_lw_physics = 4, 4, 4,
ra_sw_physics = 4, 4, 4,
radt = 30, 30, 30,
sf_sfclay_physics = 1, 1, 1,
sf_surface_physics = 2, 2, 2,
bl_pbl_physics = 1, 1, 1,
topo_wind = 0, 0, 0,
bldt = 0, 0, 0,
cu_physics = 1, 0, 0,
cudt = 5, 0, 0,
isfflx = 1,
ifsnow = 1,
icloud = 1,
surface_input_source = 1,
num_soil_layers = 4,
num_land_cat = 21,
sf_urban_physics = 0, 0, 0,
/
&dynamics
hybrid_opt = 0,
w_damping = 1,
diff_opt = 1, 1, 1,
km_opt = 4, 4, 4,
diff_6th_opt = 0, 0, 0,
diff_6th_factor = 0.12, 0.12, 0.12,
base_temp = 290.
damp_opt = 0,
zdamp = 5000., 5000., 5000.,
dampcoef = 0.2, 0.2, 0.2
khdif = 0, 0, 0,
kvdif = 0, 0, 0,
non_hydrostatic = .true., .true., .true.,
moist_adv_opt = 1, 1, 1,
scalar_adv_opt = 1, 1, 1,
gwd_opt = 3
gwd_diags = 1
/
&bdy_control
spec_bdy_width = 7,
spec_zone = 1,
relax_zone = 6,
specified = .true., .false.,.false.,
nested = .false., .true., .true.,
/
&grib2
/
&namelist_quilt
poll_servers = T,
nio_tasks_per_group = 0,
nio_groups = 1,
/
My problem is how to turn on the gwd_opt and are there any other steps to use the drag parameterization schemes appropriately in wrf.exe?
Thanks.