Updating Hovmoller recipe in Hackathon

[KZCurtin]

Addressing the issues on the Hovmoller_Temperature_Depth notebook in 02_Appetisers (as per Hackathon issues list). I have:

• Removed the salinity code and plot.
• Added documentation at the top of the recipe with MOM6 variable names for assistance with converting to MOM6.
• Also removed uses of cf-xarray.

Closes #595.

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[hrsdawson]

Suggest a slight rewording to remove salinity: "... Hovmoller plot of annual, globally-averaged anomalies of conservative temperature from..."

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[hrsdawson]

Maybe before the "To convert to.." line, we should first specify that this script is written for MOM5 output.

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[hrsdawson]

I wonder if we should update this to calculate the anomalies relative to the climatology, rather than the first year?

Although if the goal is to see model drift over time, then this current approach is appropriate. So maybe we can leave as it with this clarification ("this approach shows model drift over time").

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[hrsdawson]

I don't think(?) the area of a grid cell varies with depth in MOM5 so perhaps for clarity we should remove that here.

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[hrsdawson]

We could simplify this whole section and load the cell area variable directly (area_t) rather than calculating with dxt and dyt.

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[hrsdawson]

I think this should be "where T is the globally averaged temperature anomaly"

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[hrsdawson]

Line #8.        fig = plt.figure(figsize = (10, 6))

Now that the salinity subplot is removed, we could expand the width dimension to see more of the temporal changes.

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[adele-morrison]

@KZCurtin how is this PR going? Have you had a chance to incorporate @hrsdawson's comments? Would be great to get this finished!