Jump to content
Will it snow? 7 day forecast Weather Radar Will it be cold?
Snow?
Local
Radar
Cold?

Buriedundersnow

Members
 View Profile  See their activity

  • Posts

    3,529

  • Joined

  • Last visited

  • Days Won

    1

 Content Type 

Posts posted by Buriedundersnow

    Bárðarbunga and Askja - Volcanic Activity

    in Space, Science & nature

    Posted

     

    Sorry if this has been posted

     

    Craters have appeared on two glaciers in Iceland

     

    The recent volcano eruptions in Iceland have created enormous circular depressions in two of the country’s glaciers. These dramatic features, which differ from each other in their origins and shape, are visible from the air.

    A reconnaissance flight over Bárðar­bunga, the volcano where the first earthquakes were detected last month, shows that the ice over the caldera has fallen nearly 20 meters across an area about 7 kilometers long and 5 kilometers wide. This is a change in volume of 250 million cubic meters. The scientists at the University of Iceland attribute this shift to a movement of the base of the glacier rather than to melting. Magma has drained from a chamber under the glacier as it moves to the northeast and erupts onto the surface. As the chamber has emptied, the rock above it has shifted downward, carrying the glacier ice downward as well. This is the largest subsidence that has been observed in Iceland since measurements of the surface were begun over fifty years ago. This movement does not seem to be associated with geothermal activity at Bárðar­bunga, or of a higher likelihood of an eruption there. A recent photo from a helicopter flight shows the large extent and relative shallowness of this cauldron (the technical term for these craters).
    cauldron-Dyngjujokull-source-Almannavarn
     
     

     

     

     

    interesting article but it doesn't count KATLA I was watching a programme the other night on discovery science it was the first time it had been shown as it was relatively new and it was talking about KATLA and they took the guy up onto the glacier and there were also cauldrons up on top of the glacier you could see them and they were saying these were being caused but the heat from below like these ones on BARDARBUNGA so really its three glaciers which have these cauldrons happening on them the ones on KALTA they were saying appeared over the last 12 months but if you take into account probably a six month period between filming and this appearing on the telly then 18 months or so these kind of things have been appearing there as well.

     

    there is a tendency for when eruptions happen on this off shoot of the main central rift area that runs through Iceland then it means the whole area activates and goes through periods of high energy then periods where it goes to sleep so we may be seeing the whole area going into an active period so there should be more eruptions to follow throughout this whole area in the coming years.

    Bárðarbunga and Askja - Volcanic Activity

    in Space, Science & nature

    Posted

    SO2 blocks sunlight quite effectively when it gets up into the stratosphere, so it would make it colder, but it takes an eruption like this months to do it I think. (according to what I have read over the years on the net)

     

    The thing is I have a hunch that it takes less SO2 in the stratosphere than we realize to give us a cold winter in the UK, I think we will get one anyhow now.

    Just a hunch not scientific fact at all.

     

     

     

    the so2 doesn't have to get into the stratosphere it can still do the same damage at lower levels of the atmosphere a fissure eruption would be unlikely to get the so2 right up into the stratosphere you would need a big explosive eruption like KATLA to do that although it doesn't get right into the stratosphere when it is released and interacts with water vapour in the atmosphere it then turns the so2 into sulphuric acid which reflects the sunlight and it can hang around in the atmosphere for years before it naturally dissipates now if we think if it was only to get up to 850hpa or 500hpa which is nowhere near the stratosphere then it would cool the lower layers of the atmosphere reducing the temp gradient meaning we would be more likely to see snow as the air below wouldn't warm as much as usual and we could see snow with upper temps we usually wouldn't purely because the lower levels in the atmosphere are colder than usual with the same upper air temps.

     

    it wouldn't create more blocking but it can disrupt weather patters greatly across the globe like LAKI it caused major drought in Africa and caused the indian monsoons to fail and it affected every continent on the planet but LAKI was like this it only had about a 2 mile section erupt at a time but the lava fountains would have been a mile high and maximum flow rate was 150,000 cubic feet per second and it ejected chlorine and fluorine and its so2 output for the total 9 month eruption was 120 mega tonnes I don't know how much this one is yet or will end up being.

     

    this eruption could go on a while if you think of LAKI taking 9 months and the eruption doing same as is just now working its way along the fissure or dyke then this could last a while as well and will be likely to erupt along the whole dyke and under the glacier at some point which will make the eruption more explosive and once this happens it will really be time to watch as if it does turn more explosive then it could have further effects on the fissure itself and put far more strain on the area.

     

    its going to be good watching for the next couple of months at least I think if this goes along the whole fissure then its eruption length will be close to LAKI but I don't think we will get the same amount of magma coming from it but I could be wrong.

    • Like 1

    Bárðarbunga and Askja - Volcanic Activity

    in Space, Science & nature

    Posted · Edited by Buriedundersnow

    as an ex chemist, I have my doubts as to whither the S02 will have much effect on the winter unless we got a big bang. SO2 is a heavy gas and will stay in the lower atmosphere unless there is a big explosion. I think it needs to be in the upper troposphere or Stratosphere to affect our weather with Blocking.

    I may be wrong, if I am can one of the experts put me right

     

     

    LAKI was a fissure eruption and the gases didn't go high in the atmosphere but it radically changed weather patterns and caused a cooling which lasted a few years but that was a bigger fissure eruption than this but the so2 at low levels can still affect the weather in a big way it destroyed crops and that back then as well with acid rain and an acidic fog which was over Europe like I said though that was a far bigger eruption than this one LAKI was 27km long and has one of the biggest lava flows in the world.

    Bárðarbunga and Askja - Volcanic Activity

    in Space, Science & nature

    Posted

    Probably gossip as the seismometer doesn't look very lively.

    Karyo

     

     

    the guy that reported it is in touch with the people on the ground so it will probably be real its hard to work out what it was its hard to see on the cams whats going on if the lava is still flowing or has stopped it could be something as simple as the lava stopping and pressure in the fissure changing and causing booming sounds and the smoke was just some ash particles getting ejected we will just need to wait for further news.

     

    don't be fooled with the seismometers not showing much it could mean something bigger is building so will still need to keep an eye on things we could end up with the fissure stopping then pressure building in bardarbunga through that.

    Bárðarbunga and Askja - Volcanic Activity

    in Space, Science & nature

    Posted

    is it just me or are the EQ'S now becoming more concentrated on 3 areas.

     

    1) the caldera itself

     

    2) in the extrusion to the north of the glacier

     

    3) at the northern edge of the dyke.

     

    with No3, could it be a result of less pressure in  the dyke as the magma now has an exit route, or that there could still be magma extending the dyke making it longer.

     

    Just noticed when looking at the 3d bulge maps for the last 16hrs.

     

     

    the ones in the caldera will be from the magma chamber breathing as such think of a lung it will be taking in magma (breathing in) then ejecting it along the dyke to the fissure (breathing out) and we should get periodic earthquakes as the chamber empties into dyke which is bount to be fracturing the caldera roof as it does this.

     

    to the north of the glacier and that will partly be the fissure still working open and from the flow of magma and the force of it leaving the fissure.

     

    the more important bit to be watching is to the northeast of ASKJA this is a separate fissure and where we have EQ activity earlier in the year and there could be a chance that magma is coming up through the whole system from BARDARBUNGA right up past ASKJA just its finding it harder in the ASKJA area now if these two fissure systems link and come open it will blow ASKJA as well.

    • Like 1

    Bárðarbunga and Askja - Volcanic Activity

    in Space, Science & nature

    Posted · Edited by Buriedundersnow

    now a lot of sulphur in the magma should we see a big eruption could be problematic like LAKI was it also released high amounts of sulphur and caused a lot of deaths.

     

    now there is no say whether it will erupt again or even if the sulphur would be released from the magma but its something to keep in mind and even if we don't see an eruption then theres a good chance that a later eruption would produce a lot of sulphur then.

     

    so if not now it will be something to continue to keep eyes on any unrest or future events.

    Bárðarbunga and Askja - Volcanic Activity

    in Space, Science & nature

    Posted

    Gisli Olafsson â€@gislio 5m

    Scientists from @uni_iceland just released the chemical composition report for #Holuhraun - http://bit.ly/1pfKNDV  - #Bardarbunga

     

    Erik Klemetti â€@eruptionsblog 5m

    Petrologic and geochemical data on the basalt erupted near Bardarbunga earlier this week: http://jardvis.hi.is/efnasamsetning_holuhraunsins_nyja_er_komin â€¦ (via @jonfr500) 

     

    Erik Klemetti â€@eruptionsblog 4m

    Long and short: the magma appears to be degassed with surprising high amount of sulfur in the magma (that didn’t get released as SO2).

    • Like 1
×
×
  • Create New...