UPDATE/Bumped: Mount Redoubt is at it again. Here’s the latest report from the Alaska Volcano Observatory:
At 06:00 AKDT there was a significant explosive event at Redoubt. An ash cloud has reached at least 50,000 feet above sea level and is spreading towards the south and east. AVO seismometers indicate a lahar in the Drift River Valley.
AVO has upgraded the alert level to WARNING and aviation color code to RED.
This is a strong seismic event comparable to the events from March 23-28. Strong seismic activity is ongoing as of 07:01 AKDT.
Haven’t seen much about these multiple eruptions in the press and yet they may have some impact on ice melt and weather patterns. Later: Watts UP With That has a discussion of this issue
in the discussion – a previous eruption of an Icelandic volcano – Laki
Laki is also known for its atmospheric effects. The convective eruption column of Laki carried gases to altitudes of 15 km (10 miles). These gases formed aerosols that caused cooling in the Northern Hemisphere, possibly by as much as 1 degree C. This cooling is the largest such volcanic-induced event in historic time. …
This event is rated as VEI6 on the Volcanic Explosivity Index, but the eight month emission of sulfuric aerosols resulted in one of the most important climatic and socially repercussive events of the last millennium.
In Great Britain, the summer of 1783 was known as the “sand-summer” due to ash fallout. The eruption continued until 7 February 1784. Grímsvötn volcano, from which the Laki fissure extends, was also erupting at the time from 1783 until 1785. The outpouring of gases, including an estimated 8 million tons of fluorineand estimated 120 million tons of sulfur dioxide gave rise to what has since become known as the “Laki haze” across Europe. This was the equivalent of three times the total annual European industrial output in 2006, and also equivalent to a Mount Pinatubo-1991 eruption every three days. …
…The fog was so thick that boats stayed in port, unable to navigate, and the sun was described as “blood coloured”
This disruption then led to a most severe winter in 1784, where an estimated to have caused 8,000 additional deaths in the UK. In the spring thaw, Germany and Central Europe then reported severe flood damage.
In North America, the winter of 1784 was the longest and one of the coldest on record. It was the longest period of below-zero temperatures in New England, the largest accumulation of snow in New Jersey, and the longest freezing over of Chesapeake Bay. There was ice skating in Charleston Harbor, a huge snowstorm hit the south, the Mississippi Riverfroze at New Orleans, and there was ice in the Gulf of Mexico.
From the Alaska Volcano Observatory comes this cool photo of Volcano Mount Redoubt which has been erupting over and over again since about March 25th 23rd and is still smoking. Will this cool the planet or warm the ice cap? The jury is still out. Might be a wash.