Reply #8: 3 days is too short a time to consider.

[Ready4Change]

Pick any 3 days and the average temp will be some number of degrees higher or lower than 'average.' So the original claim, that post 9/11 grounding of planes raised temps, isn't valid.

Still, the question of how that eruption might effect our climate is a good one. A BBC report I saw the other day addressed that, asking if this would result in vastly cooler temps, as has occurred in our recorded history. The answer was no. Apparently the clouds from this event aren't hot enough to reach high enough into the atmosphere to have any effect. They are low enough that rain and gravity will cause the particles to precipitate out. Had it been hotter, the particles could have gone higher, where they could have remained for a much longer time and had a stronger effect.

So, no strong temperature effect from the eruption.

I've not heard if, say, two weeks worth of grounded planes in Europe might have any effect at all. I doubt it, but I also admit I'm no expert.