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ERROR: Cannot combine time-independent data with time-dependent data for field LANDSEA.mask

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N

ntmanhvn181

Member
Hi everyone,
I had a problem when run the metgrid program with the SST updating option at the initial time.
The detail of this problem is displayed in the below:
Code: 
[cloud@igplogin WPS.2]$ ./metgrid.exe 
Processing domain 1 of 2
    SST:2014-07-05_00
 Processing 2014-07-05_00
    FILE
ERROR: Cannot combine time-independent data with time-dependent data for field LANDSEA.mask
Here is my namelist option:
&share
wrf_core = 'ARW',
max_dom = 2,
start_date = '2014-07-05_00:00:00', '2014-07-05_00:00:00', '2020-10-27_00:00:00',
end_date = '2014-07-10_00:00:00', '2014-07-10_00:00:00', '2020-10-30_00:00:00',
interval_seconds = 21600
io_form_geogrid = 2,
/

&geogrid
parent_id = 1,1,
parent_grid_ratio = 1,3,
i_parent_start = 1,61,
j_parent_start = 1,60,
e_we = 526,1129,
e_sn = 352,757,
geog_data_res = '2m','30s',
dx = 18000,
dy = 18000,
map_proj = 'mercator',
ref_lat = 19.963,
ref_lon = 130.031,
truelat1 = 19.963,
truelat2 = 0.0,
stand_lon = 130.031,
geog_data_path = '/work/users/agpc/share/geog',
ref_x = 236.5,
ref_y = 195.0,
/

&ungrib
out_format = 'WPS',
prefix = 'FILE',
&metgrid
fg_name = 'FILE',
constants_name = 'SST:2014-07-05_00',
io_form_metgrid = 2,

/

&mod_levs
press_pa = 201300 , 200100 , 100000 ,
95000 , 90000 ,
85000 , 80000 ,
75000 , 70000 ,
65000 , 60000 ,
55000 , 50000 ,
45000 , 40000 ,
35000 , 30000 ,
25000 , 20000 ,
15000 , 10000 ,
5000 , 1000
/
Click to expand...
Please help me to solve this problem.
Any suggestion is appreciated!
Thank all,
 
I got the same error message.
I am running a long simulation with GFS input and additional SST from ERA5.
First, all modules in WPS were running fine, but then there was a problem with Skin Temperature while running WPS. Then I found out about the Invariant data from ERA (Landmask).
So, I run ungrib with ERA data using ERA-interim and ECMWF Vtables, and I got invariant data, run it on ungrib and set constants_name = 'INVARIANT' under &metgrid, but when running metgrid this same message appeared (ERROR: Cannot combine time-independent data with time-dependent data for field LANDSEA.mask).
I'll be following the post here and wait for insights. Thanks in advance for any given.

OBS: the last lines of metgrid.log:

2021-03-04 23:52:21.342 --- Getting input fields from ERA5_INVARIANT:1979-01-01_00
2021-03-04 23:52:21.535 --- Processing LANDSEA at level 200100.000000.
2021-03-04 23:52:21.537 --- Preparing to process output time 2015-12-25_00
2021-03-04 23:52:21.537 --- Getting input fields from FILE
2021-03-04 23:52:22.341 --- ERROR: Cannot combine time-independent data with time-dependent data for field LANDSEA.mask
 
SST are included in your intermediate files and it is time-varying. If you specify constants_name = 'SST:2014-07-05_00', which means that SST should be a constant variable and will not change with time. WPS will be confused and it cannot use this 'constant' data to replace the time-varying SST in your intermediate file.

One simple way to solve this option is to delete SST in your intermediate file. You may modify Vtable and delete the line related to SST. In this case after you run ungrib.exe, SST will not be included in the intermediate file. And SST specified by constants_name = 'SST:2014-07-05_00' will be read into the model and used as is.

Please let me know whether the above option works.
 
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