Global Cooling and Volcanism

After viewing this chart the first time I always wondered what role vulcanism played in the Little Ice Age and other global cooling events.

Volcanic activity

I have noodled the idea for years that sun spots, or lack of spots, have influenced the climate of the planet and that there was some connection between solar activity and vulcanism on the earth. Not finding any highly evident connection, I just accepted the idea that volcanism was cyclical and influenced the global temperature.

That is until I say this graphic and read Willis Eschenbach Stacking Up the Volcanos post


Willis’ Conclusion:

Well, I’d say that this is very strong evidence that the global temperature is not at the mercy of changes in forcing as is generally believed. Volcanic eruptions clearly and measurably reduce the incoming sunlight due to volcanic aerosols both reflecting and absorbing solar energy.

However, this does not cause a corresponding reduction in global average temperature. Instead, the climate system responds to reductions in forcing from eruptions by increasing the amount of energy entering the system, as well as by reducing the heat loss from the surface, in order to stabilize and maintain the surface temperature within a fairly narrow range (e.g. ± 0.3°C over the 20th century).

Willis’ full post is HERE.

Following Willis’s analysis of global temperatures on this page and here I have to rethink the whole issue of solar and volcano influenced climate change.   Your thoughts?