Re: Little Ice Age triggered by volcanic eruptions

On 1/02/12 8:21, in article elphi7pave6quqjde6ihqle6f37kfdsero@xxxxxxx, "El
Castor" <ElPoloGrande@xxxxxxxxxxx> wrote:

The Little Ice Age - the centuries-long period of cooling that began in the
Middle Ages - appears to have been triggered by four massive volcanic
eruptions in the tropics.

Maybe so, maybe not. I wouldn't argue that with you. Nice theory.


Like most science this area is in the "ongoing area".

There had been some unresolved debate on whether the Little Ice age
was global in the sense of global cooling or a local North Atlantic
event.

I looked for a while back if their is any evidence of sustained
volcanic emissions was might show up in the ice cores, in the last
few hundred thousand years. I found nothing exceptional but the
problem with volcanic actions as they represent brief slices
of time that might not be seen in an ice core layer, or missed.
The influence on world weather of Krakato was 3 years,
not lasting. Mount Pinatubo Eruption of 1991 cooled the Planet
"On June 15, millions of tons of sulfur dioxide were discharged into the
atmosphere, resulting in a decrease in the temperature worldwide over the
next few years."

You can see this cooling effect on the graph
http://data.giss.nasa.gov/gistemp/graphs_v3/Fig.A2.gif for 1991 and
1992 but the mid-1990s the increase returned, we had a record year
in 1998 for the 90s due to a El Nino + land warming renforcing the
warming effect.

Obviously several Pinatubos in the same decade might provoke a casade
effect and produce global cooling for a decade or more. As CO2 continues
the increase, however, the main driving force for warming would dominate
again. In the Little Ice age, the cooling has the effect of lowering
slightly the CO2 content by absorption into the ocean and a lowering
of photosynthesis on land and sea. This time around man makes the
difference.






Current climate models assume a volcanic emission
effect every 15 or so years. that last one which affected global
temperatures briefly was

.

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