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 H2 SO4 which can remain in the stratosphere for several years.

reference

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