Showtime for Alaska volcano?

According to the Alaska Volcano Observatory, satellite images show that lava has reached the edge of the crater on Cleveland Mountain in the Aleutian Islands.

Volcano monitors say if the dome continues to grow on the uninhabited mountain about 940 miles southwest of Anchorage, it could overflow the rim and increase the possibility of an explosion.

An eruption could send up an ash cloud 20,000 feet or more, the observatory warns. This could threaten aircraft.

Thanks to John Reno for this link

5 thoughts on “Showtime for Alaska volcano?”

  1. Is it true these high latitude volcanoes, like Cleveland and Katla, when they have major eruptions tend to drive the temperature of the northern hemisphere down a degree or two?

  2. Tom.
    My understanding of the climate/volcano issue is that any volcano that gets sulphur dioxide, smoke and fine dust into the stratosphere, will cause slight cooling of the planet but I stress “slight” (maybe 0.5ºC) Somehow we do see larger regional extremes following big events such as the 1982 El Chichon or 1992 Pinatubo eruptions. The difference with Katla, and other far north volcanoes is that the stratosphere begins at a lower altitude than in the tropics but last weeks Shivaluch eruption with it’s reported 8 km plume will have only marginal effect. The troposphere is turbulent (trope = overturning in Greek) and smoke soon washes back down.
    If Katla erupted through the icecap on a cold windless day it could reach the stratosphere where it would contribute to noctiluscent cloud formation. These thin frozen veils of sulphuric acid crystals reflect incoming sunlight back into space so the Pole cools and this can last for two years. Polar vortex air recirculates around the Pole so the cooling is largely contained. Only when the jet-stream does a big meander over the USA or UK do we see that ‘coolth’ migrating southward. (I expect we will see a bit of this in the coming months).

  3. Yes, and not just the Far Northern Latitudes. If sufficient dust and ash are pushed high enough into the atmosphere they can migrate globally for years and tip the “tipping point,” causing a domino effect, or a downward spiral of global temperatures.

  4. Hmmmmmm, I wonder what would happen if we had four or five good sized eruptions, say Katla, Cleveland, El Heirro, Krakatau, etc. all within a few weeks of each other? Tipping Point? Any thoughts?

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