User:Geo-editing

I'm not sure where I should have put this, this should replace the now-abbreviated second paragraph on the volcanic ash page

Volcanic ash particles have a maximum residence time in the troposphere of a few weeks, and the finest tephra particles remain in the stratosphere for only a few months, and have only minor climatic effects. The major climate influence from volcanic eruptions is caused by gaseous sulfer compounds, chiefly SO₂, which reacts with OH and H₂0 in the stratosphere to create H₂SO₄ which can remain in the stratosphere for several years.

reference

Robock, Alan. "Volcanic eruptions and climate." Reviews of geophysics 38.2 (2000):191-219.