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耦合模型版本是WRFv4.5-CMAQv5.4,使用28cpu运行相同模拟时段、namelist、排放文件的case两次,发现在开启气溶胶反馈的情况下(wrf_cmaq_option=2),模拟结果会在某一时刻出现偏差,并且这个偏差会随时间增加,偏差高值出现在云量大的区域。而在只使用耦合模型的WRF部分时(wrf_cmaq_option=0),偏差仍会出现。我想尝试使用单核运行试图消除偏差,但模拟时长难以接受,想问问大家关于偏差产生的原因和解决方法。
&time_control
run_hours = 24,
run_minutes = 0,
run_seconds = 0,
start_year = 2019,
start_month = 09,
start_day = 21,
start_hour = 00,
start_minute = 00,
start_second = 00,
interval_seconds = 10800,
input_from_file = .true.,
HISTORY_INTERVAL = 60,
FRAMES_PER_OUTFILE = 24,
restart = .TRUE.,
restart_interval = 1440,
write_hist_at_0h_rst = .true.,
io_form_history = 2,
io_form_restart = 2,
io_form_input = 2,
io_form_boundary = 2,
io_form_auxinput2 = 2,
io_form_auxinput4 = 2,
debug_level = 0,
auxinput4_inname = "wrflowinp_d01",
auxinput4_interval = 360,
auxinput4_end_h = 1000000,
auxinput11_interval = 1,
auxinput11_end_h = 2160,
auxinput1_inname = "metoa_em.d<domain>.<date>"
reset_simulation_start = .false.,
/
&wrf_cmaq
wrf_cmaq_option = 2,
wrf_cmaq_freq = 5,
met_file_tstep = 10000,
direct_sw_feedback = .true.,
feedback_restart = .false.,
/
&domains
time_step = 60,
time_step_fract_num = 0,
time_step_fract_den = 1,
max_dom = 1,
s_we = 1,
e_we = 283,
s_sn = 1,
e_sn = 184,
s_vert = 1,
e_vert = 39,
p_top_requested = 5000,
eta_levels = 1.0000, 0.9979, 0.9956, 0.9931,
0.9904, 0.9875, 0.9844, 0.9807,
0.9763, 0.9711, 0.9649, 0.9575,
0.9488, 0.9385, 0.9263, 0.9120,
0.8951, 0.8753, 0.8521, 0.8251,
0.7937, 0.7597, 0.7229, 0.6833,
0.6410, 0.5960, 0.5484, 0.4985,
0.4467, 0.3934, 0.3393, 0.2850,
0.2316, 0.1801, 0.1324, 0.0903,
0.0542, 0.0241, 0.0000
num_metgrid_levels = 32,
dx = 27000,
dy = 27000,
grid_id = 1,
parent_id = 0,
i_parent_start = 1,
j_parent_start = 1,
parent_grid_ratio = 1,
parent_time_step_ratio = 1,
feedback = 1,
smooth_option = 0,
/
&physics
mp_physics = 10,!3,
mp_zero_out = 2,!0,
mp_zero_out_thresh = 1.0e-8,
ra_lw_physics = 4,
ra_sw_physics = 4,
radt = 20,
co2tf = 1,
sf_sfclay_physics = 7,
num_soil_layers = 2,
pxlsm_smois_init = 0,
pxlsm_modis_veg = 1,
sf_surface_physics = 7,
sf_urban_physics = 0,
bl_pbl_physics = 7,
bldt = 0,
cu_physics = 1,
kfeta_trigger = 2,
cudt = 0,
ishallow = 0,
shcu_physics = 0,
prec_acc_dt = 60,
isfflx = 1,
ifsnow = 0,
icloud = 1,
cu_rad_feedback = .true.,
surface_input_source = 1,
num_land_cat = 20,
num_soil_cat = 16,
sst_update = 1,
!sst_skin = 1,
seaice_threshold = 100,
slope_rad = 1,
topo_shading = 1,
shadlen = 25000.,
do_radar_ref = 1,
grav_settling = 0,
/
&fdda
grid_fdda = 1,
grid_sfdda = 0,
gfdda_inname = "wrffdda_d01",
sgfdda_inname = "wrfsfdda_d01",
pxlsm_soil_nudge = 0,
sgfdda_end_h = 1000000,
sgfdda_interval_m = 180,
GFDDA_END_H = 2160,
gfdda_interval_m = 180,
fgdt = 0,
if_no_pbl_nudging_uv = 1,
if_no_pbl_nudging_t = 1,
if_no_pbl_nudging_q = 1,
if_zfac_uv = 0,
k_zfac_uv = 10,
if_zfac_t = 0,
k_zfac_t = 10,
if_zfac_q = 0,
k_zfac_q = 10,
guv = 0.0001, !0.0003,
gt = 0.0001, !0.0003,
gq = 0.00001,!0.0001, !0.0003,
guv_sfc = 0.0000,
gt_sfc = 0.0000,
gq_sfc = 0.0000,
if_ramping = 1,
dtramp_min = 60.0,
io_form_gfdda = 2,
rinblw = 250.0
/
&dynamics
hybrid_opt = 0,
w_damping = 0,
diff_opt = 1,
km_opt = 4,
diff_6th_opt = 2,!0,
diff_6th_factor = 0.12,
damp_opt = 3,!0,
base_temp = 290.
zdamp = 5000.,
dampcoef = 0.05,!0.01,
khdif = 0,!3000,
kvdif = 0,
non_hydrostatic = .true.,
moist_adv_opt = 2,!1,
tke_adv_opt = 2,!1,
scalar_adv_opt = 2,!1,
use_theta_m = 1,
/
&bdy_control
spec_bdy_width = 5,
spec_zone = 1,
relax_zone = 4,
specified = .true.,
spec_exp = 0.0,
nested = .false.,
/
&grib2
/
&namelist_quilt
nio_tasks_per_group = 0,
nio_groups = 1,
/
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