I encountered the following issue while working with output files from the WRF-Chem model. I want to calculate the daily and monthly averages of PM2.5 using the output files with a 6-hour resolution. Therefore, I used the following bash command:
```bash
for file in wrfout_d01_2023-01-??_00:00:00; do
cdo timmean $file ${file}_monmean.nc;
done
```
However, I received the following error message:
```
cdi warning (cdf_set_var): Inconsistent variable definition for XLAT!
cdi warning (cdf_set_var): Inconsistent variable definition for XLONG!
cdi warning (cdf_set_var): Inconsistent variable definition for XLAT_U!
cdi warning (cdf_set_var): Inconsistent variable definition for XLONG_U!
cdi warning (cdf_set_var): Inconsistent variable definition for XLAT_V!
cdi warning (cdf_set_var): Inconsistent variable definition for XLONG_V!
cdi warning (cdf_check_variables): Unsupported data type (char/string), skipped variable Times!
cdi warning (cdfInqContents): Coordinates variable XTIME can't be assigned!
Killed
```
It seems there are some issues with the coordinate and reference system. Can anyone help me resolve this problem?
```bash
for file in wrfout_d01_2023-01-??_00:00:00; do
cdo timmean $file ${file}_monmean.nc;
done
```
However, I received the following error message:
```
cdi warning (cdf_set_var): Inconsistent variable definition for XLAT!
cdi warning (cdf_set_var): Inconsistent variable definition for XLONG!
cdi warning (cdf_set_var): Inconsistent variable definition for XLAT_U!
cdi warning (cdf_set_var): Inconsistent variable definition for XLONG_U!
cdi warning (cdf_set_var): Inconsistent variable definition for XLAT_V!
cdi warning (cdf_set_var): Inconsistent variable definition for XLONG_V!
cdi warning (cdf_check_variables): Unsupported data type (char/string), skipped variable Times!
cdi warning (cdfInqContents): Coordinates variable XTIME can't be assigned!
Killed
```
It seems there are some issues with the coordinate and reference system. Can anyone help me resolve this problem?