wrfout变量经纬度

Nozigaka46

ncfile_s = nc.Dataset(
r"F:\WRF-Use\WRF_case\OUTPUT\wrfout_d02_2023-06-23_20_00_00")
ncfile_e = nc.Dataset(
r"F:\WRF-Use\WRF_case\OUTPUT\wrfout_d02_2023-06-24_20_00_00")

# 获取变量并做平滑处理
rainc_s = smooth2d(getvar(ncfile_s,"RAINC"),3)
rainnc_s = smooth2d(getvar(ncfile_s,"RAINNC"),3)
rainsh_s = smooth2d(getvar(ncfile_s,"RAINSH"),3)
rainc_e = smooth2d(getvar(ncfile_e,"RAINC"),3)
rainnc_e = smooth2d(getvar(ncfile_e,"RAINNC"),3)
rainsh_e =smooth2d(getvar(ncfile_e,"RAINSH"),3)

prei = (rainc_e + rainnc_e + rainsh_e) - (rainc_s + rainnc_s + rainsh_s)
lats, lons = latlon_coords(prei)

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如上：执行上述代码，出现错误：
lats, lons = latlon_coords(prei)  
File "D:\Software\Study\miniconda3\envs\work\lib\site-packages\wrf\util.py", line 3445, in latlon_coords   
raise ValueError("'var' object does not contain a latitude
"ValueError: 'var' object does not contain a latitude coordinate

意思是我的prei并没有经纬度这个coords，为什么？变量的相加减理论上不应该会把其属性也进行对应操作
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奇怪的时，把wrfour_d02 更换成 wrfout_d01后，代码运行正常无报错
请教各位老师和大佬，这是为什么？