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my understanding is also limited Colin, but there were two LaNina events and two ElNino events in the decade in question, so I would have expected cloud cover to fluctuate quite wildly year to year if the SOI was the driver. Instead it seems to have been on quite a stable and steady decline, regardless of ElNino/LaNina. Maybe something more permanent or with a longer timescale is in play?
Anyway, lets hope cloud cover backs off a bit - and quickly.
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