What would be the climate effect of an under-water, or under-ice supervolcano?

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Offline CliffordK

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I was just thinking about the climate tonight.

What would be the climate effect of having a huge supervolcano erupt in the middle of the Atlantic or Pacific ocean.  Or, perhaps under an ice sheet such as Antarctica or Greenland?

I could imagine a huge plume of water reaching up into the stratosphere.  And, as quick as one batch of water was blasted away, the next water would be there, perhaps like a giant geyser. 

Perhaps the rain would be enough to make Noah think about building a bigger boat.