AOD_550 coming out to be very high

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Dr. Sahir Azmi

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Mar 29, 2024, 4:48:09 AM3/29/24

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I want to estimate AOD_550 using WRF-Chem; it is coming out to be close to ~10^30 ug/m3 hourly; which doesn't seems realistic. Also, model sometimes completes and sometimes stops calculating such high values.

These infinite high values start showing up after every hour.

I have tried many combinations with namelist but no success.

here is my namelist:
&time_control
start_year = 2023, 2023, 2022,
start_month = 06, 06, 02,
start_day = 20, 08, 01,
start_hour = 00, 00, 00,
start_minute = 00, 00, 00,
start_second = 00, 00, 00,
end_year = 2023, 2023, 2022,
end_month = 06, 06, 02,
end_day = 22, 12, 03,
end_hour = 18, 18, 00,
end_minute = 00, 00, 00,
end_second = 00, 00, 00,
interval_seconds = 21600,
input_from_file = .true.,.true.,.true.,
history_interval = 180, 180, 180,
frames_per_outfile = 1, 1, 1,
restart = .false,
restart_interval = 120,
io_form_history = 2
io_form_restart = 2
io_form_input = 2
io_form_boundary = 2
debug_level = 0
auxinput4_inname = 'wrflowinp_d<domain>',
io_form_auxinput4 = 2,
auxinput4_interval_m = 360,
auxinput4_end_h = 100000,
auxinput5_inname = 'wrfchemi_d<domain>_<date>',
io_form_auxinput5 = 2,
frames_per_auxinput5 = 1,
auxinput5_interval_m = 360,
auxinput6_inname = 'wrfbiochemi_d<domain>',
io_form_auxinput6 = 2,
auxinput6_interval_d = 90,
auxinput7_inname = 'wrffirechemi_d<domain>_<date>',
io_form_auxinput7 = 2,
frames_per_auxinput7 = 1,
auxinput7_interval_m = 60,
!iofields_filename = "my_file_d01.txt"
auxhist3_outname = 'wrfout_hourly_d<domain>_<date>',
auxhist3_interval_m = 60,60,60,
frames_per_auxhist3 = 1,1,1,
io_form_auxhist3 = 2,
!auxinput12_inname = 'wrf_chem_input',
!io_form_auxinput12 = 2,
write_hist_at_0h_rst = .false.,

!auxhist4_outname = 'wrfout_saqib_d<domain>_<date>',
!auxhist4_interval_m = 60,60,60,
!frames_per_auxhist4 = 1,1,1,
!io_form_auxhist4 = 2,
!force_use_old_data = T,

/

&domains
time_step = 36,
time_step_fract_num = 0,
time_step_fract_den = 1,
max_dom = 1,
s_we = 1,
s_sn = 1,
e_we = 30, 340, 94,
e_sn = 30, 208, 91,
e_vert = 36, 36, 30,
p_top_requested = 5000.,
num_metgrid_levels = 42,
num_metgrid_soil_levels = 4,
dx = 6000, 3000, 3333.33,
dy = 6000, 3000, 3333.33,
grid_id = 1, 2, 3,
parent_id = 1, 1, 2,
i_parent_start = 1, 119, 30,
j_parent_start = 1, 76, 30,
parent_grid_ratio = 1, 3, 3,
parent_time_step_ratio = 1, 3, 3,
feedback = 1,
smooth_option = 2
eta_levels = 1.000, 0.9975, 0.995, 0.990, 0.985,
0.980, 0.970, 0.960, 0.950,
0.940, 0.930, 0.920, 0.910,
0.900, 0.880, 0.860, 0.840,
0.820, 0.800, 0.770, 0.740,
0.700, 0.650, 0.600, 0.550,
0.500, 0.450, 0.400, 0.350,
0.300, 0.250, 0.200, 0.150,
0.100, 0.050, 0.000
/

&physics
mp_physics = 10, 10, 10
progn = 1, 1, 1
ra_lw_physics = 4, 4, 4
ra_sw_physics = 4, 4, 4
radt = 6, 5, 30
sf_sfclay_physics = 5, 1, 1,
sf_surface_physics = 4, 2, 5,
bl_pbl_physics = 5, 1, 1,
bldt = 0, 0, 0,
cu_physics = 5, 11, 3,
cudt = 5, 5, 0,
cu_diag = 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,
maxiens = 1,
maxens = 3,
maxens2 = 3,
maxens3 = 16,
ensdim = 144,
cu_rad_feedback = .true.,.false.,
sst_update = 1,
! prec_acc_dt = 60,
/

&fdda
grid_fdda = 1, 0, 0,
gfdda_inname = 'wrffdda_d<domain>',
gfdda_end_h = 100000, 24, 24,
gfdda_interval_m = 360, 360, 360,
fgdt = 0, 0, 0,
if_no_pbl_nudging_uv = 1, 0, 0,
if_no_pbl_nudging_t = 1, 1, 1,
if_no_pbl_nudging_q = 1, 1, 1,
if_zfac_uv = 1, 1, 1,
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,
if_ramping = 1,
dtramp_min = 60.0,
io_form_gfdda = 2,
/

&dynamics
etac = 0.15
hybrid_opt = 2,
rk_ord = 3,
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 = 3,
zdamp = 5000., 5000., 5000.,
dampcoef = 0.2, 0.2, 0.2,
khdif = 0, 0, 0,
kvdif = 0, 0, 0,
epssm = 0.1, 0.1, 0.1,
non_hydrostatic = .true., .true., .true.,
moist_adv_opt = 2, 2, 2,
chem_adv_opt = 2, 2, 2,
scalar_adv_opt = 2, 2, 2,
tke_adv_opt = 2, 2, 2,
/

&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,
/

&chem
kemit = 8,
chem_opt = 202, 0, 0,
bioemdt = 30, 30, 30,
photdt = 30., 30., 30.,
chemdt = 6, 3.0, 3.0,
io_style_emissions = 2,
emiss_inpt_opt = 102, 102, 102,
emiss_opt = 10, 10, 10,
chem_in_opt = 1, 1, 1,
phot_opt = 3, 4, 4,
gas_drydep_opt = 1, 1, 1,
aer_drydep_opt = 1, 1, 1,
bio_emiss_opt = 3, 3, 3,
gas_bc_opt = 1, 1, 1,
gas_ic_opt = 1, 1, 1,
aer_bc_opt = 1, 1, 1,
aer_ic_opt = 1, 1, 1,
gaschem_onoff = 1, 1, 1,
aerchem_onoff = 1, 1, 1,
wetscav_onoff = 1, 1, 1,
cldchem_onoff = 1, 1, 1,
vertmix_onoff = 1, 1, 1,
chem_conv_tr = 1, 0, 1,
conv_tr_wetscav = 1, 1, 1,
conv_tr_aqchem = 1, 1, 1,
seas_opt = 2,
dust_opt = 3,
dmsemis_opt = 1,
biomass_burn_opt = 0, 0, 0,
ne_area = 140
plumerisefire_frq = 30, 0, 0,
scale_fire_emiss = .false.,
aer_ra_feedback = 1, 1, 1,
aer_op_opt = 4, 1, 1,
ne_area = 500,
opt_pars_out = 1,
have_bcs_chem = .true., .false.,.false.,
have_bcs_upper = .false., .false., .false.,
fixed_ubc_press = 50.,
fixed_ubc_inname = 'ubvals_rcp4_5.2deg_2020-2029.nc',
is_full_tuv = .false.,
has_o3_exo_coldens = .true.,
pht_cldfrc_opt = 2,
cld_od_opt = 2,
aerosoldep = 1,
!mozart_ph_diag = 1,
/

Indranil Nandi

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Mar 29, 2024, 5:08:00 AM3/29/24

to Dr. Sahir Azmi, wrf-chem-run

Dear Dr. Sahir,

First of all if you are trying to calculate AOD (Aerosol Optical Depth) at 550 nm using WRF-Chem then please kindly note that AOD is a unit less quantity. ug/m3 is not a correct unit of AOD.

Now for calculationG AOD you have to use the output variable 'EXTCOF55' (Extinction coefficients for .55um), 'PH' (perturbation geopotential), and 'PHB' (base-state geopotential).

check the following link for details and also I am attaching a sample code which is compatible with MATLAB

https://groups.google.com/a/ucar.edu/g/wrf-chem/c/4bXEmSM693Q

for K1=1:130 %%%% No. of files %%%%
filenumber = filenumber+1;
m3 = fscanf(fp3,'%s',1);
n3 = m3(1:end-3);
file_1=strcat(n3,'.nc');
nc_filename = file_1

EXTCOF55_F = double(ncread(nc_filename,'EXTCOF55'));
PH = double(ncread(nc_filename,'PH'));
PHB = double(ncread(nc_filename,'PHB'));
Height_Data = (PH + PHB)./(9.81);
Height_Data_Km = Height_Data.*(10^-3);

for X=1:44 %%%% No. of pressure levels in wrf output files %%%%
Distance(:,:,X,:) = Height_Data_Km(:,:,X+1,:) - Height_Data_Km(:,:,X,:);
COEFF_DATA_Converted(:,:,X,:) = (EXTCOF55_F(:,:,X,:).*Distance(:,:,X,:));
end
AOD(:,:,:,K1)= nansum(COEFF_DATA_Converted,3); %%%% AOD at 550 nm %%%%

end

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Indranil Nandi

Ph.D. Research Scholar
Centre for Atmospheric Sciences
IIT Delhi, Hauz Khas, New Delhi 110016, India

Contact No. 8902005948

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