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Something wrong with wind fields of simulated typhoon

Y

Yue Wu

New member
It should be convergence in the lower layers of typhoon, but the output of simulation looks quite odd. 1749028875671.pngFigure 1 shows the wind at 850 hPa, which shows strong divergence. I've tried several methods to test, including chaging simulating cases, modifying physic schemes and reducing zdamp to . But it still doesn't work. 1749029219939.png Can anyone offer me some suggestions? Many thanks.
 
Now I found that there might be some problems in WPS. The wind fields in met_em files have already become divergent....
 
What data did you ungrib to provide forcing for this case?

If met_em is wrong, it is highly possible that the forcing data is problematic.
 
Ming Chen said:
What data did you ungrib to provide forcing for this case?

If met_em is wrong, it is highly possible that the forcing data is problematic.
Click to expand...
I've tried CFSR and ERA5, both of them don't work. And the geo_em files look fine. Would it be the problems with ungrib?
 
Oh, it reminds me of another issue. When I tried to plot the domains with default plotgrid_new.ncl, the figure is odd too. wps_domain.png
 
This is the comparison of U wind between ERA5 and met_em. Looks like a rotation in wind fields.联想截图_20250606115326.jpg
 
Ming Chen said:
Please upload your namelist.wps for me to take a look. Thanks.
Click to expand...
Thanks for your reply. Here is the namelist:

&share

wrf_core = 'ARW',

max_dom = 2,

start_date = '2024-09-05_00:00:00','2024-09-05_00:00:00','2024-09-03_18:00:00',

end_date = '2024-09-07_21:00:00','2024-09-07_21:00:00','2024-09-08_00:00:00',

interval_seconds = 10800

io_form_geogrid = 2,

/



&geogrid

parent_id = 1, 1, 1,

parent_grid_ratio = 1, 3, 9,

i_parent_start = 1, 61, 126, !越大越北

j_parent_start = 1, 51, 130, !越大越西

e_we = 205, 361, 280, !越大南北？向格点越多

e_sn = 266, 439, 271, !越大东西向格点越多

!

!!!!!!!!!!!!!!!!!!!!!!!!!!!! IMPORTANT NOTE !!!!!!!!!!!!!!!!!!!!!!!!!!!!

! The default datasets used to produce the MAXSNOALB and ALBEDO12M

! fields have changed in WPS v4.0. These fields are now interpolated

! from MODIS-based datasets.

!

! To match the output given by the default namelist.wps in WPS v3.9.1,

! the following setting for geog_data_res may be used:

!

! geog_data_res = 'maxsnowalb_ncep+albedo_ncep+default', 'maxsnowalb_ncep+albedo_ncep+default',

!

!!!!!!!!!!!!!!!!!!!!!!!!!!!! IMPORTANT NOTE !!!!!!!!!!!!!!!!!!!!!!!!!!!!

!

geog_data_res = 'default','default',

dx = 9000,

dy = 9000,

map_proj = 'lambert',

ref_lat = 18.0,

ref_lon = 112.0,

truelat1 = 30.0,

truelat2 = 60.0,

stand_lon = -98.0,

geog_data_path = '/public/home/WY/WRF4.2/WPS/WPS_GEOG/'

/



&ungrib

out_format = 'WPS',

prefix = 'ERA-PL',

/



&metgrid

fg_name = 'ERA-PL','ERA-SFC'

io_form_metgrid = 2,

/
 
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