html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,performed_via_github_app,issue
https://github.com/pydata/xarray/issues/7191#issuecomment-1286980037,https://api.github.com/repos/pydata/xarray/issues/7191,1286980037,IC_kwDOAMm_X85MtcHF,14932329,2022-10-21T13:42:41Z,2022-10-21T13:42:41Z,NONE,"
@kmuehlbauer 
So it looks like uwnd.encoding does contain ```_FillVale ``` and ```missing_value ``` which are contrasting. Setting them to equal values enables a save. 


However, these variables were set to contrasting values after an xarray subset or save. See workflow below. It appears that to_netcdf will assign ``` '_FillValue': nan ```. I don't know if this is behavior that requires a change, or if it is just a quirk that folks will have to work through. 

```python 
fn_E20c_VP=sorted(glob.glob('/Users/wchapman/Downloads/uvwndNOAA/uwnd*.nc'))
DSorig = xr.open_dataset(fn_E20c_VP[0])
DSorig.uwnd.encoding
```
```
{'zlib': True,
 'szip': False,
 'zstd': False,
 'bzip2': False,
 'blosc': False,
 'shuffle': True,
 'complevel': 2,
 'fletcher32': False,
 'contiguous': False,
 'chunksizes': (1, 1, 73, 144),
 'least_significant_digit': 1,
 'source': '/Users/wchapman/Downloads/uvwndNOAA/uwnd.1950.nc',
 'original_shape': (365, 17, 73, 144),
 'dtype': dtype('float32'),
 'missing_value': -9.96921e+36}
```
Subset and Save: 
```python
fn_E20c_VP=sorted(glob.glob('/Users/wchapman/Downloads/uvwndNOAA/uwnd*.nc'))
DS_subset = DSorig.sel(level=300)
DS_subset.to_netcdf('/Users/wchapman/Downloads/test_behavior.nc')
DS_subset.uwnd.encoding
```
```
{'zlib': True,
 'szip': False,
 'zstd': False,
 'bzip2': False,
 'blosc': False,
 'shuffle': True,
 'complevel': 2,
 'fletcher32': False,
 'contiguous': False,
 'chunksizes': (1, 1, 73, 144),
 'least_significant_digit': 1,
 'source': '/Users/wchapman/Downloads/uvwndNOAA/uwnd.1950.nc',
 'original_shape': (365, 17, 73, 144),
 'dtype': dtype('float32'),
 'missing_value': -9.96921e+36}
```
Re-open newly saved file and inspect : 

```python
DS_subset_aftersave = xr.open_dataset('/Users/wchapman/Downloads/test_behavior.nc')
DS_subset_aftersave.uwnd.encoding
```
```
{'zlib': True,
 'szip': False,
 'zstd': False,
 'bzip2': False,
 'blosc': False,
 'shuffle': True,
 'complevel': 2,
 'fletcher32': False,
 'contiguous': False,
 'chunksizes': (1, 73, 144),
 'least_significant_digit': 1,
 'source': '/Users/wchapman/Downloads/test_behavior.nc',
 'original_shape': (365, 73, 144),
 'dtype': dtype('float32'),
 'missing_value': -9.96921e+36,
 '_FillValue': nan,
 'coordinates': 'level'}
```

","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,1416709246
https://github.com/pydata/xarray/issues/7191#issuecomment-1285892163,https://api.github.com/repos/pydata/xarray/issues/7191,1285892163,IC_kwDOAMm_X85MpShD,14932329,2022-10-20T17:14:24Z,2022-10-20T17:14:24Z,NONE,"@kmuehlbauer it looks like encoding is empty. 

```python 
print(DS_cera0.encoding)
# {}
```","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,1416709246