python-xarray rename data variable

I've created a `xarray.DataArray` and I save it using `xarray.DataArray.to_netcdf`. I create it using: ``` datatmp = np.full([nens, len(modanom.coords['time'].values), len(modanom.coords['latitude'].values), len(modanom.coords['longitude'].values)], np.nan) b = xr.DataArray(datatmp, coords=[range(1,nens + 1), modanom.coords['time'], modanom.coords['latitude'], modanom.coords['longitude']], dims=['ensemble', 'time', 'latitude', 'longitude']) ``` i.e. I don't specify a name such as: ``` b = xr.DataArray({'windspeed': (('ensemble', 'time', 'latitude', 'longitude'), datatmp)}, coords=[range(1,nens + 1), modanom.coords['time'], modanom.coords['latitude'], modanom.coords['longitude']], dims=['ensemble', 'time', 'latitude', 'longitude']) ``` I do some manipulation of this file and obtain root mean square error and the resultant `xarray.Dataset` is ``` <xarray.DataArray (latitude: 81, longitude: 131, time: 1)> array([[[ nan], [ nan], ..., [ nan], [ nan]], [[ nan], [ nan], ..., [ nan], [ nan]], ..., [[ nan], [ 0.843295], ..., [ 0.794338], [ nan]], [[ nan], [ nan], ..., [ nan], [ nan]]]) Coordinates: * latitude (latitude) float64 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 ... * longitude (longitude) float64 260.0 261.0 262.0 263.0 264.0 265.0 266.0 .. * time (time) datetime64[ns] 1983-01-15T12:00:00 ``` When reading in the netCDF file I have a `xarray.Dataset` which looks like: ``` <xarray.Dataset> Dimensions: (latitude: 81, longitude: 131, time: 1) Coordinates: * latitude (latitude) float64 0.0 1.0 2.0 3.0 4.0 ... * longitude (longitude) float64 260.0 261.0 262.0 ... * time (time) datetime64[ns] 1983-01-15T12:00:00 Data variables: __xarray_dataarray_variable__ (latitude, longitude, time) float64 nan ... Attributes: _NCProperties: version=1|netcdflibversion=4.4.1|hdf5libversion=1.8.18 ``` Can I rename the `__xarray_dataarray_variable__`? The reason I ask is because as I have functions which create `xarray.Dataset`'s and therefore I don't specify a data variable name. However, I would like to rename it before plotting.