Corresponded with a period of strong volcanism AND with low sunspot activity … and here we go again.
“The Little Ice Age, a centuries-long spell of cold summers in Europe and elsewhere, began suddenly late in the 13th century,” writes journalist Devin Powell inScience News.
“A string of volcanic explosions may have set off this change in climate by belching particles that reflected sunlight and allowed Arctic sea ice to reach epic proportions.”
“This cooling wasn’t gradual; it was an abrupt shift,” says Gifford Miller, a paleoclimatologist and geologist at the University of Colorado Boulder.
When Miller’s team carbon dated moss entombed in the ice on Canada’s Baffin Island, they found “two sudden advances of the snow line that killed off the vegetation: a sudden cold spell between 1275 to 1300, followed by intensifying cold between 1430 and 1455.”
Enter the volcanoes
“The second half of the 13th century had the most volcanism of any period of the past 1,500 years,” says Alan Robock, an atmospheric scientist at Rutgers University.
Polar ice samples have revealed a series of eruptions: an especially big explosion somewhere in the world in 1258, and three smaller ones in 1268, 1275 and 1284.
Bingo! Look at those dates! I’ve been yelling for years that a sudden increase in volcanism could drive us into an ice age almost overnight.
Now here’s the proof.
Enter the sunspots
More ominously, and something that Miller and his colleagues may not have noticed, is that both periods of cooling occurred in sync with low sunspot activity. Those two periods of low sunspot activity are known respectively as the Wolf Minimum and the Sporer Minimum.
When you get to this page, click on the graph again to make it even bigger: http://www.vukcevic.co.uk/GrandMinima.gif
Can it be that low sunspot activity triggers volcanic activity on earth? I suspect that it does.
With sunspot activity now at a 100-year low – and forecast to go even lower – can there be any question as to where our climate is headed?
Start stockpiling that food!
Thanks to Alex Tanase and Steve Foster for this link