[Sacajaweau]

Never been so low during the years of weather satellites. And how many years would that be?? In other words, they know very little about the history of these sheets.

And it may be that a volcano has heated up and doing the melting...not the atmosphere.

[Rurudyne]

Exactly!

And it’s less time than you might think because the Landsat program only began in 1972. It would have possibly taken years to have more than a few pictures from space of anyplace uninteresting to the national security types.

[PIF]

Never been so low during the years of weather satellites.

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The first satellite - TIROS I - went up in 1960 for a 78 day working life. So that gives us less than 60 years or so of observations.