Reduces compute time & fixes maps

[polinaesia]

This PR keeps plots stable by replacing Intake-attached geolon_t/geolat_t on ht with the unmasked geolon_t/geolat_t coordinates from ocean_grid.nc (raised in #556). This is necessary because the coordinates currently attached by Intake are masked over continents (contain NaNs), and Cartopy fails to produce figure when x/y include NaNs (e.g. GEOSException: Points of LinearRing do not form a closed linestring)

What's improved:

1. Time-averaging now happens after selecting bottom values (instead of before), which cuts compute time and memory.
2. Figures now render the Arctic correctly
3. Added gridlines and lon/lat labels.
4. Fixed colourbar levels/ticks for consistent intervals.

What needs fixing:
Ensure Intake loader attaches unmasked geolon_t/geolat_t

p.s. I also added Claire's note on MOM5-to-MOM6 conversion raised in
#581.

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[navidcy]

@polinaesia, the first comment in the PR is very descriptive -- nice!
Could you update the PR title to briefly describe what the PR does? E.g., "Adds snow in the maps in the tutorials"

[polinaesia]

@navidcy I can't change the title, soz, will make it more informative next time

[navidcy]

This doesn't work for you?

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julia-neme commented on 2025-10-13T01:18:05Z
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Line #9.    import logging

Apparently we shouldn't suppress warnings :(

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julia-neme commented on 2025-10-13T01:18:06Z
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Why does this look different if they're the same experiment and same time period?

polinaesia commented on 2025-10-13T02:05:31Z
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You mean the values? If so, it's because I adjusted the contour levels instead of leaving them automatic as in the original. However, if you mean the shape of the continents in the NH, the original recipe was incorrect and distorted the Arctic.

julia-neme commented on 2025-10-13T03:10:08Z
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Ups sorry I didn't realise there were extra levels sorry!

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julia-neme commented on 2025-10-13T01:18:07Z
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Also a lot lot slower than the OG.

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julia-neme commented on 2025-10-13T01:18:07Z
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Also looks different?

polinaesia commented on 2025-10-13T02:05:57Z
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Same answer

[julia-neme]

See comments in reviewNB

[polinaesia]

You mean the values? If so, it's because I adjusted the contour levels instead of leaving them automatic as in the original. However, if you mean the shape of the continents in the NH, the original recipe was incorrect and distorted the Arctic.

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[polinaesia]

Same answer

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[julia-neme]

Ups sorry I didn't realise there were extra levels sorry!

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