[UPDATE AT END]
I had no intention of doing a post when I remembered late what I had meant to do today but the result is I think important.
This is a hovmuller plot plus two incidentals which come along for the ride, existing code, lots in involved here.
North at top, South at bottom. Month slices side by side vertically.
How do I explain this one, sheesh. Shown these plots a few times. The change here is quickly hacking an existing experimental facility to call a low pass filter for each horizontal line of temperature, in this dataset has them at 5 degree lattitude intervals.
Quick what-if, low pass at about 10 years, set the colour range to +3C.
Worked perfectly first time. (looks over shoulder, what’s the catch?)
- What was going on 1940 to 1960? Does this give a clue on SST?
- 2000 onwards, why the appearance of cold to the far south?
Far too late, off to sleep. I leave it to any early readers to figure it out.
Pulled update of hadsst2 and crutem3, plotted and made a composite, ouch.
Note: crutem scaling is different
Makes it crystal clear SST dominates. Is my code right? I hope so.