A few months back I wrote about the "Year Without A Summer". As you may recall from the earlier post, in 1816 New England had frost and often snow every month of the summer. That was probably due to the impact of the large Tambora volcano eruption in Indonesia, much larger than Krakatoa. Scientists have long suspected that there was another volcano, about half the size of the 1815 one but still huge, a few years earlier. Now that seems to be nailed down, at least to the year:1809. The volcano was apparently somewhere in the tropics.
While 1816 was the worst of the years, the entire decade from 1810 to 1819 was cold, colder than any other decade since we started keeping records. (http://www.sciencedaily.com/releases/2 009/12/091205105844.htm)
Volcanoes cool climate both locally, and in the case of the big ones, globally, by ejecting sulphur dioxide particles into the atmosphere. They block enough sunlight to change the earth's energy balance for a few years. To add insult to injury they also deplete the ozone layer.
As super volcanoes go, Tambora was a relatively small one. A really big one like the Toba super volcano 74,000 years ago apparently triggered a decade of 'years without a summer' and may have been behind a human genetic bottleneck that happened about that time. If something like that happened again, well let's just say it would make Mad Max look optimistic. Fortunately the really big ones are rare, though volcanoes large enough to have an impact on civilization have happened with a fair amount of frequency.
While 1816 was the worst of the years, the entire decade from 1810 to 1819 was cold, colder than any other decade since we started keeping records. (http://www.sciencedaily.com/releases/2
Volcanoes cool climate both locally, and in the case of the big ones, globally, by ejecting sulphur dioxide particles into the atmosphere. They block enough sunlight to change the earth's energy balance for a few years. To add insult to injury they also deplete the ozone layer.
As super volcanoes go, Tambora was a relatively small one. A really big one like the Toba super volcano 74,000 years ago apparently triggered a decade of 'years without a summer' and may have been behind a human genetic bottleneck that happened about that time. If something like that happened again, well let's just say it would make Mad Max look optimistic. Fortunately the really big ones are rare, though volcanoes large enough to have an impact on civilization have happened with a fair amount of frequency.
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