[develop] Patch to correct a variable name to a lower-case (#468)

* Update plot_allvars.py

Updating a variable name "Geopotential Height" to "Geopotential height". Lower-case is needed for it to work with a newer Python.

* Update plot_allvars_diff.py

Updating a variable name "Geopotential Height" to "Geopotential height" (lower-case). This is needed to work with newer Python

ush/Python/plot_allvars.py

@@ -353,7 +353,7 @@ def rotate_wind(true_lat,lov_lon,earth_lons,uin,vin,proj,inverse=False):
   cin = data1.select(name='Convective inhibition',typeOfLevel='surface')[0].values
 
 # 500 mb height, wind, vorticity
-  z500 = data1.select(name='Geopotential Height',level=500)[0].values * 0.1
+  z500 = data1.select(name='Geopotential height',level=500)[0].values * 0.1
   z500 = ndimage.filters.gaussian_filter(z500, 6.89)
   vort500 = data1.select(name='Absolute vorticity',level=500)[0].values * 100000
   vort500 = ndimage.filters.gaussian_filter(vort500,1.7225)

ush/Python/plot_allvars_diff.py

@@ -383,9 +383,9 @@ def rotate_wind(true_lat,lov_lon,earth_lons,uin,vin,proj,inverse=False):
   cin_diff = cin_2 - cin_1
 
 # 500 mb height, wind, vorticity
-  z500_1 = data1.select(name='Geopotential Height',level=500)[0].values * 0.1
+  z500_1 = data1.select(name='Geopotential height',level=500)[0].values * 0.1
   z500_1 = ndimage.filters.gaussian_filter(z500_1, 6.89)
-  z500_2 = data2.select(name='Geopotential Height',level=500)[0].values * 0.1
+  z500_2 = data2.select(name='Geopotential height',level=500)[0].values * 0.1
   z500_2 = ndimage.filters.gaussian_filter(z500_2, 6.89)
   z500_diff = z500_2 - z500_1
   vort500_1 = data1.select(name='Absolute vorticity',level=500)[0].values * 100000