Alaskan volcano erupts, spewing ash skywardEnvironmental | 206787 hits | Mar 23 8:07 am | Posted by: tritium  Eruptions at Alaska's Mount Redoubt volcano have sent a plume of smoke nearly 15,000 metres above sea level.Commentsview comments in forum Page 1 You need to be a member of CKA and be logged into the site, to comment on news. |
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It's a necessary evil and it's damn beautiful.
Your all the reason why we can't have anything nice in this house!
Now to move it to that favourite topic 'Climate Change'. With the one in the south pacific and this one in Alaska the increased particulates in the atmosphere will diminish the intensity of the suns rays. In other words it will help cool the atmosphere for the next couple of years or so.
Maybe, but there's more to it. The dust particles land on the ice. This attracts heat, and aids in ice melt.
Another interesting one shedding light on something different was the underwater eruption last week off Tonga. They were measuring massive outlays of underwater heat. This is interesting because the one small section of the antarctic where ice is melting has an underwater volcanic presence which has yet to be satisfactorily measured.
Now to move it to that favourite topic 'Climate Change'. With the one in the south pacific and this one in Alaska the increased particulates in the atmosphere will diminish the intensity of the suns rays. In other words it will help cool the atmosphere for the next couple of years or so.
Maybe, but there's more to it. The dust particles land on the ice. This attracts heat, and aids in ice melt.
Another interesting one shedding light on something different was the underwater eruption last week off Tonga. They were measuring massive outlays of underwater heat. This is interesting because the one small section of the antarctic where ice is melting has an underwater volcanic presence which has yet to be satisfactorily measured.
I agree it is more complex. The large particles will fall out very rapidly and relativley close to the volcano. Very fine particles that rise into the stratosphere can stay for months. Sulpher compounds will rise rapidly into the stratosphere and create tiny droplets of sulphuric acid that reflect a great amount of light. Large eruptions can lower global temperatures by a degree or two for a couple of years.
Oceanic changes can last for decades if the affected water mass is large enough. That would make studying the effect of volcanic activity at Tonga and the Antartic an important long term project to help understand the variation in our climate over the millenia.
Oman found high latitude volcanoes like Katmai (Alaska in 1912) instead favored the negative phase of the Arctic and North Atlantic Oscillations and cold winters. In the negative phase, the jet stream winds buckled and forced cold air south from Canada into the eastern United States and west from Siberia into Europe. They also favored a cooling of middle and higher latitudes the year round of that atmosphere and a weakening of the summer monsoon in India. Is this event (Mt. Redoubt) strong enough and the material injected into the stratosphere which is lower in high latitudes (well below 50,000 feet) large enough to have a major impact. That assessment will take a few days.
http://icecap.us/images/uploads/Major_E ... Alaska.pdf
Sounds like it blew last night so no pics, but here's what it looked like the last time it erupted in 1989.
What a wicked photo!
This is all because of those fat people who drive cars!
Your all the reason why we can't have anything nice in this house!
NOOOOO it all Sarah Palins fault