Didnt Mt St Helens erupting cool the global temperature by a full degree?
Darned it I know.
Although the 1980 eruption of Mt. St. Helens lowered global temperatures by 0.1 OC, the much smaller eruption of El Chichon lowered global temperatures three to five times as much. Although the Mt. St. Helens blast emitted a greater amount of ash in the stratosphere, the El Chichon eruption emitted a much greater volume of sulfur-rich gases (40x more).
Clearly there are no rules that can be applied to all volcanoes. Except for maybe that they are all hot. What I always find amusing is that everyone ignores the obvious HEAT emitted by these objects. What about the HEAT from the volcano or the HEAT from automobiles. One would think they are important metrics themselves. Guess who was the first to propose the theory that cooling can result from the eruptions of volcanic eruptions ? He was one of those 'evil' founders of our Republic.