Output

Discuss the nesting capability within the model itself and any problems you might have run into.

Output

Postby Shigeoki » Fri Jul 21, 2017 12:04 am

Dear WRF users

I am a newbie to WRF model.
I am trying to do nesting for WRF over Vietnam with 3 domains. However, the results I got from WRF for 3 domains are almost the same. I know that it makes almost no benefit if the domains have the same result. I would be grateful if any of you could point out what is the possible cause of the issue.
I have attached my namelist.input file and the results of temperature at 2m for your reference.

Namelist.input
&time_control
run_days = 1,
run_hours = 0,
run_minutes = 0,
run_seconds = 0,
start_year = 2009, 2009, 2009,
start_month = 12, 12,12,
start_day = 27, 27, 27,
start_hour = 00, 00, 00,
start_minute = 00, 00,00,
start_second = 00, 00,00,
end_year = 2010, 2010, 2010,
end_month = 02, 02, 02,
end_day = 01, 01, 01,
end_hour = 00, 00, 00,
end_minute = 00, 00,00,
end_second = 00, 00,00,
interval_seconds = 3600
input_from_file = .true., .true., .true.,
fine_input_stream = 0, 0,0,
history_interval = 60, 60,60,
frames_per_outfile = 100, 100,100,
restart = .true.,
restart_interval = 1440,
io_form_history = 2
io_form_restart = 2
io_form_input = 2
io_form_boundary = 2
debug_level = 9999
auxinput1_inname = "met_em.d<domain>.<date>"
auxinput4_inname = "wrflowinp_d<domain>"
auxinput4_interval = 360,
io_form_auxinput4 = 2
write_hist_at_0h_rst = .true.
/

&domains
time_step = 150,
time_step_fract_num = 0,
time_step_fract_den = 1,
max_dom = 3,
s_we = 1,
e_we = 130,133,91,
s_sn = 1,
e_sn = 100, 91,85,
s_vert = 1, 1,1,
e_vert = 50, 50, 50,
num_metgrid_levels = 27,
num_metgrid_soil_levels = 4,
dx = 36000,12000,4000,
dy = 36000,12000,4000,
grid_id = 1, 2, 3,
parent_id = 1,1,2,
i_parent_start = 1,51,39,
j_parent_start = 1,38,33,
parent_grid_ratio = 1,3,3,
parent_time_step_ratio = 1, 3, 3,
feedback = 1,
smooth_option = 0
p_top_requested = 10000
/

&physics
sst_update = 1
mp_physics = 3, 3, 3,
ra_lw_physics = 1, 1, 1,
ra_sw_physics = 1, 1, 1,
radt = 30, 30, 30,
sf_sfclay_physics = 1, 1, 1,
sf_surface_physics = 2, 2, 2,
bl_pbl_physics = 1, 1, 1,
bldt = 0, 0, 0,
cu_physics = 2, 3, 0,
cudt = 5, 5, 5,
isfflx = 1,
ifsnow = 0,
icloud = 1,
surface_input_source = 1,
num_soil_layers = 4,
sf_urban_physics = 0, 0, 0,
/

&fdda
grid_fdda = 0, 0, 0,
gfdda_inname = "wrffdda_d<domain>",
gfdda_end_h = 8784, 24, 24,
gfdda_interval_m = 360, 180, 180,
fgdt = 0, 0, 0,
if_no_pbl_nudging_uv = 0, 0, 0,
if_no_pbl_nudging_t = 1, 1, 1,
if_no_pbl_nudging_q = 1, 1, 1,
if_zfac_uv = 0, 0, 0,
k_zfac_uv = 10, 10, 10,
if_zfac_t = 0, 0, 0,
k_zfac_t = 10, 10, 10,
if_zfac_q = 0, 0, 0,
k_zfac_q = 10, 10, 10,
guv = 0.0003, 0.0003, 0.0003,
gt = 0.0003, 0.0003, 0.0003,
gq = 0.0003, 0.0003, 0.0003,
gph = 0.0003, 0.0003, 0.0003,
xwavenum = 3
ywavenum = 3
if_ramping = 0,
dtramp_min = 60.0,
io_form_gfdda = 2,
/

&dynamics
w_damping = 0,
diff_opt = 1,
km_opt = 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,
/

&bdy_control
spec_bdy_width = 5,
spec_zone = 1,
relax_zone = 4,
specified = .true., .false.,.false.,
nested = .false., .true., .true.,
/

&grib2
/

&namelist_quilt
nio_tasks_per_group = 0,
nio_groups = 1,
/

Temperatures at 2m:

Tempd01 Tempd02 Tempd03
15.03485 15.18484 15.33475
14.18353 14.42526 14.49725
15.92883 15.78284 15.92404
17.67709 17.521 17.55261
18.17749 18.22968 18.13629
14.03073 14.13004 13.90158
13.61316 13.42038 13.67606
14.10236 14.18051 14.11142
17.90503 18.04025 18.23221
19.53442 19.2576 19.10959
16.08688 16.56598 16.83621
11.87482 12.17038 12.26794
11.12476 11.33774 11.49823
11.64188 11.70477 11.78412
14.97461 14.89322 15.04895
15.82489 16.22427 16.38699
16.41647 16.67828 16.83115
17.04187 17.24075 17.32828
18.86386 18.75446 18.75256
20.79413 20.81537 20.57639
19.95987 19.84955 19.79144
17.21384 17.06909 17.04532
16.35391 16.45999 16.48404
15.84088 15.69196 15.98889
18.74274 18.80078 18.95248
17.60294 17.61938 17.70267
19.37283 19.27936 19.20493
21.62332 21.68399 21.78864
21.8924 21.96454 21.98499
21.8689 21.80219 21.75436
22.1647 22.23535 22.18719

Thanks in advance
Shigeoki
 
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Joined: Wed Jun 28, 2017 7:46 pm

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