[Wrf-users] wrfout timing issues with adaptive time stepping in WRF 3.2
Zulauf, Michael
Michael.Zulauf at iberdrolausa.com
Mon May 24 17:26:47 MDT 2010
Hi again all. . .
I've run up against another issue with WRF 3.2, and while I've got a
request for help with wrfhelp, I thought I'd also check with wrf-users.
This is using a setup that is essentially the same as what has worked
fine with previous versions of WRF, so I think it's something new with
WRF 3.2.
At the bottom of this email is an example of a namelist.input where I
see my problem. This is a model run with 4 domains, and where d04 has
output every 20 minutes. As you can see, I'm using adaptive time
stepping, with adjust_output_times and step_to_output_time both set to
true.
The wrfout files are getting written, and the file names reflect the
time that I want them written at, but when I use ncdump to look at the
actual time it was saved at, it shows a different time. For example:
File name: wrfout_d04_2009-12-14_20:20:00
>From ncdump:
Times =
"2009-12-14_20:20:50" ;
As you can see, the internal time is off by 50 seconds (which is not
reflected in the file name). I'm using WPP v3.2 and a slightly modified
version of the run_wrfpost_minutes script, and it can't handle the
discrepancy in the times properly.
Presumably I could add another post-processing step, where I simply
reset the Times variable in the wrfout to the value I want. For most
purposes I don't think that this should cause any problems, but it just
feels like such a nasty sort of hack that I'm a bit resistant to that
approach. Plus if I ever want to do something where I'm differencing or
averaging wrfout's, then this will introduce additional errors (though
small in most instances).
Any help will be greatly appreciated!
Thanks,
Mike
------------------------------------------------------------------------
----------------------------
&time_control
run_days = 0,
run_hours = 96,
run_minutes = 0,
run_seconds = 0,
start_year = 2009,2009,2009,2009,
start_month = 12,12,12,12,
start_day = 14,14,14,14,
start_hour = 00,03,06,09,
start_minute = 00, 00, 00, 00, 00, 00,
start_second = 00, 00, 00, 00, 00, 00,
end_year = 2009,2009,2009,2009,
end_month = 12,12,12,12,
end_day = 18,18,18,15,
end_hour = 00,00,00,12,
end_minute = 01, 01, 01, 01, 01, 01,
end_second = 00, 00, 00, 00, 00, 00,
interval_seconds = 10800,
input_from_file =
.true.,.true.,.true.,.true.,.true.,
fine_input_stream = 0, 2, 2, 2,
io_form_auxinput2 = 2
history_interval = 60,60,60,20,
frames_per_outfile = 1, 1, 1, 1, 1, 1,
restart = .false.,
restart_interval = 1440,
io_form_history = 2
io_form_restart = 2
io_form_input = 2
io_form_boundary = 2
debug_level = 0
adjust_output_times = .true.
/
&domains
time_step = 180,
time_step_fract_num = 0,
time_step_fract_den = 1,
max_dom = 4,
s_we = 1,1,1,1,
e_we = 268,622,280,382,
s_sn = 1,1,1,1,
e_sn = 184,418,250,196,
s_vert = 1, 1, 1, 1, 1, 1,
e_vert = 31, 31, 31, 31, 31, 31,
num_metgrid_levels = 27 ,
eta_levels = 1.000, 0.993, 0.980, 0.966,
0.950, 0.933, 0.913, 0.892, 0.869, 0.844, 0.816, 0.786, 0.753, 0.718,
0.680, 0.639, 0.596, 0.550, 0.501, 0.451, 0.398, 0.345, 0.290, 0.236,
0.188, 0.145, 0.108, 0.075, 0.046, 0.021, 0.000,
p_top_requested = 5000,
dx = 27000,9000,3000,1000,
dy = 27000,9000,3000,1000,
grid_id = 1, 2, 3, 4, 5, 6,
parent_id = 1, 1, 2, 3, 4, 5,
i_parent_start = 1, 31, 91, 92,
j_parent_start = 1, 23,183, 93,
parent_grid_ratio = 1, 3, 3, 3, 3, 3,
parent_time_step_ratio = 1, 3, 3, 3, 3, 3,
feedback = 0,
smooth_option = 2
use_adaptive_time_step = .true.
step_to_output_time = .true.
target_cfl = 1.1,1.1,1.1,1.1,
max_step_increase_pct = 5, 51, 51, 51, 51, 51
starting_time_step = 180, 60, 20, 6.66666667
max_time_step = 240, 80, 26.66666667, 8.88888889
min_time_step = 27, 9, 3, 1
adaptation_domain = 4
/
&physics
mp_physics = 5, 5, 5, 5,
ra_lw_physics = 1, 1, 1, 1,
ra_sw_physics = 1, 1, 1, 1,
radt = 30, 30, 30, 30, 30,
30,
sf_sfclay_physics = 1, 1, 1, 1,
sf_surface_physics = 1, 1, 1, 1,
bl_pbl_physics = 1, 1, 1, 1,
bldt = 0, 0, 0, 0, 0,
0,
cu_physics = 1, 1, 0, 0, 0,
0,
cudt = 5, 5, 5, 0, 0,
0,
cam_abs_freq_s = 21600,
levsiz = 59,
paerlev = 29,
cam_abs_dim1 = 4,
cam_abs_dim2 = 31,
isfflx = 1,
ifsnow = 0,
icloud = 1,
surface_input_source = 1,
num_soil_layers = 5,
sf_urban_physics = 0, 0, 0, 0,
mp_zero_out = 0,
maxiens = 1,
maxens = 3,
maxens2 = 3,
maxens3 = 16,
ensdim = 144,
slope_rad = 0,
topo_shading = 0,
/
&fdda
grid_fdda = 1, 0, 0,
gfdda_inname = "wrffdda_d<domain>",
gfdda_interval_m = 180, 0, 0,
gfdda_end_h = 12, 0, 0,
io_form_gfdda = 2,
fgdt = 0, 0, 0,
if_no_pbl_nudging_uv = 0, 0, 0,
if_no_pbl_nudging_t = 1, 0, 0,
if_no_pbl_nudging_q = 1, 0, 0,
if_zfac_uv = 0, 0, 0,
k_zfac_uv = 10, 10, 10,
if_zfac_t = 1, 0, 0,
k_zfac_t = 10, 10, 10,
if_zfac_q = 1, 0, 0,
k_zfac_q = 10, 10, 10,
guv = 0.0001, 0.0001, 0.0001,
gt = 0.0001, 0.0001, 0.0001,
gq = 0.000001, 0.000001, 0.000001,
if_ramping = 0,
dtramp_min = 0.0,
/
&dynamics
w_damping = 1,
diff_opt = 1,
km_opt = 4,
diff_6th_opt = 0,
diff_6th_factor = 0.12,
base_temp = 290.
damp_opt = 0,
zdamp = 5000., 5000., 5000.,
dampcoef = 0.01, 0.01, 0.01
khdif = 0, 0, 0,
kvdif = 0, 0, 0,
non_hydrostatic = .true., .true., .true.,
moist_adv_opt = 1, 1, 1, 1
scalar_adv_opt = 1, 1, 1, 1
use_baseparam_fr_nml = .true.
/
&bdy_control
spec_bdy_width = 5,
spec_zone = 1,
relax_zone = 4,
specified = .true.,
.false.,.false.,.false.,.false., .false.,
nested = .false., .true., .true.,.true.,
.true., .true.,
/
&grib2
/
&namelist_quilt
nio_tasks_per_group = 0,
nio_groups = 1,
/
------------------------------------------------------------------------
----------------------------
--
Mike Zulauf
Meteorologist
Wind Asset Management
Iberdrola Renewables
1125 NW Couch, Suite 700
Portland, OR 97209
Office: 503-478-6304 Cell: 503-913-0403
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