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Dear wrf-users,<br>
<br>
We are trying to do a restart run using WRF-ARW v3.5 and adaptive
time step. Unfortunately the results are inconsistent, specially in
near surface variables. This is the case for 2 meters temperature
that do have very small diurnal oscillation compared to fixed time
step run.<br>
<br>
As an example you can see attached the pictures of 2 different
restarts starting at 09-15-2014 00Z. Left pictures show the fixed
time step run while right pictures are created using adaptive time
step. Bottom pictures show results at +15h simulation time. As you
can see they are quite different.<br>
<br>
Simulation previous to restart runs were performed for 4 days using
adaptive time step and the only difference in the "namelist.input"
of the restart runs is the variable "use_adaptive_time_step".<br>
<br>
Any clues would be appreciated.<br>
<br>
The "namelist.input" file is as follows:<br>
<br>
&time_control<br>
run_days = 5,<br>
run_hours = 0,<br>
run_minutes = 0,<br>
run_seconds = 0,<br>
start_year = 2014,2014,<br>
start_month = 9,9,<br>
start_day = 15,15,<br>
start_hour = 0,0,<br>
start_minute = 00, 00,<br>
start_second = 00, 00,<br>
end_year = 2014,2014,<br>
end_month = 9,9,<br>
end_day = 20,20,<br>
end_hour = 0,0,<br>
end_minute = 00, 00,<br>
end_second = 00, 00,<br>
interval_seconds = 21600<br>
input_from_file = .true.,.true.,<br>
fine_input_stream = 2, 2,<br>
history_interval = 60, 60,<br>
frames_per_outfile = 1000, 1000,<br>
restart = .true.,<br>
restart_interval = 5760,<br>
io_form_history = 2<br>
io_form_restart = 2<br>
io_form_input = 2<br>
io_form_boundary = 2<br>
io_form_auxinput2 = 2<br>
debug_level = 000<br>
use_netcdf_classic = .true.<br>
write_hist_at_0h_rst = .true.<br>
reset_simulation_start = .true.<br>
override_restart_timers = .true.<br>
/<br>
<br>
&domains<br>
time_step = 216,<br>
time_step_fract_num = 0,<br>
time_step_fract_den = 1,<br>
max_dom = 2,<br>
s_we = 1, 1,<br>
e_we = 119, 172,<br>
s_sn = 1, 1,<br>
e_sn = 105, 139,<br>
s_vert = 1, 1,<br>
e_vert = 33, 33,<br>
num_metgrid_levels = 27<br>
eta_levels = 1.000, 0.994, 0.990, 0.986,
0.981,<br>
0.971, 0.952, 0.933, 0.904,
0.875,<br>
0.856, 0.827, 0.798, 0.760,
0.712,<br>
0.664, 0.616, 0.568, 0.520,
0.448,<br>
0.376, 0.304, 0.232, 0.184,
0.121,<br>
0.097, 0.059, 0.050, 0.040,
0.030,<br>
0.020, 0.010, 0.000,<br>
dx = 36000, 12000,<br>
dy = 36000, 12000,<br>
p_top_requested = 1000<br>
grid_id = 1, 2,<br>
parent_id = 0, 1,<br>
i_parent_start = 1, 47,<br>
j_parent_start = 1, 28,<br>
parent_grid_ratio = 1, 3,<br>
parent_time_step_ratio = 1, 3,<br>
feedback = 0,<br>
smooth_option = 0,<br>
use_adaptive_time_step = .true.,<br>
step_to_output_time = .true.,<br>
target_cfl = 1.1, 1.1,<br>
max_step_increase_pct = 5, 15,<br>
starting_time_step = 216, 72<br>
max_time_step = 540, 180,<br>
min_time_step = 216, 72,<br>
/<br>
<br>
.........<br>
<br>
<br>
<br>
Best wishes,<br>
<br>
Guillermo<br>
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