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900 Pinatubos don’t make an ice age – research 23 February 2010

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Environmental Research Web Blog on some research published in J. Geophys. R. last year:

Robock and colleagues injected 300 ‘Pinatubos’ of SO2 into the baseline run of their models, but also tried amounts as great as 900 Pinatubos. With a dynamic vegetation module, they explored the feedback on global temperatures of widespread death of vegetation due to the volcanic cooling. The feedback was not very impressive. Precipitation dropped markedly, but cooling reached about 10 degrees at most, and recovery was nearly complete after about a decade.

The Volcanism Blog