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In history this has happened before, in the 17th century one Icelandic volcano was active for over a year blasting ashes in to the sky and caused a climatic change for several years.
Jan
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That one halted air traffic for 400 years!
I still have a jar of Mount Saint Helens ash that my parents collected years back during a trip when they got stranded in the same airport shutdown situation. It's part of my daughter's geology collection now.