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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.Geo-editing (talk) 20:44, 20 April 2010 (UTC)[reply]

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Hello. In case you didn't know, when you add content to talk pages and Wikipedia pages that have open discussion, you should sign your posts by typing four tildes ( ~~~~ ) at the end of your comment. You may also click on the signature button located above the edit window. This will automatically insert a signature with your username or IP address and the time you posted the comment. This information is useful because other editors will be able to tell who said what, and when. Thank you. --SineBot (talk) 20:43, 20 April 2010 (UTC)[reply]