Reply #6: and what about 1816, the 'year without a summer'?

[bobbieinok]

http://www.dandantheweatherman.com/Bereklauw/yearnosummer.html

1816 - The Year without a Summer
Introduction
The period 1812-1817 was one of exceptional volcanic activity, and the sheer volume of volcanic dust pumped into the atmosphere by these volcanic eruptions caused a general, temporary cooling in the earth’s climate around this time.

This temporary climatic cooling peaked during the summer of 1816 was the peak of this cooling and the reason the peak fell in the summer of 1816 is almost certainly die to the eruption of the Tamboro volcano east of Java in April 1815 (believed to be one of the most explosive eruptions of the last 10,000 years). At the time sunspots were blamed for the unseasonable weather (Laskin 1996). Anyway, this eruption put more than 150 million tonnes of dust in the atmosphere which gradually spread around the globe acting as a veil reflecting incoming solar radiation back into space and cooling the earth (temporarily) which in turn caused a change in the world’s, and in particular the northern hemisphere’s, weather patterns. Some dust from volcanic eruptions in the West Indies in 1812 and Philippines in 1814 was also probably still the atmosphere (Lamb 1995) and this will have helped the global cooling process too.

So if Tamboro erupted in 1815 why wasn’t the summer of 1815 rather than the summer of 1816 the year without a summer? Well, the answer is that there is a time lag between a volcanic eruption and a change in weather patterns caused by the length of time needed for stratospheric winds to distribute the volcanic dust particles around the world.

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