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Post by rustyphillips on Mar 21, 2010 17:00:48 GMT
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Post by scpg02 on Mar 21, 2010 17:49:54 GMT
That blows their CO2 budget.  |
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Post by karlox on Mar 21, 2010 19:27:14 GMT
That blows their CO2 budget. Negative. They will more likely trade with their extra quota of volcano-ashes wich are said to ´cool´ earth´s atmosphere, as opposite to CO2... They won´t give up, that´s for sure! Nice land Iceland indeed!  |
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Post by scpg02 on Mar 21, 2010 20:57:23 GMT
That blows their CO2 budget. Negative. They will more likely trade with their extra quota of volcano-ashes wich are said to ´cool´ earth´s atmosphere, as opposite to CO2... They won´t give up, that´s for sure! Nice land Iceland indeed! LOL touche. |
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Post by douglavers on Mar 27, 2010 11:42:53 GMT
Apparently, whenever Eyjafjallajokull has erupted [3 recorded occasions] Katla has erupted within a period of about 1 month to two years.
Independantly of this [more or less] Katla erupts on a 50 to 80 year cycle.
a) Last eruption in 1918 [ ie next eruption is overdue]. It is a very large volcano.
b) It sits in a 10 km caldera underneath a nice fat icecap.
I have not read any speculation yet of what several cubic kilometers of fresh water [nice and light] will do to the North Atlantic Drift, yet alone the effect of a nice large moisture and sulphur dioxide injection into the upper atmosphere.
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Post by nautonnier on Mar 27, 2010 12:32:26 GMT
Apparently, whenever Eyjafjallajokull has erupted [3 recorded occasions] Katla has erupted within a period of about 1 month to two years. Independantly of this [more or less] Katla erupts on a 50 to 80 year cycle. a) Last eruption in 1918 [ ie next eruption is overdue]. It is a very large volcano. b) It sits in a 10 km caldera underneath a nice fat icecap. I have not read any speculation yet of what several cubic kilometers of fresh water [nice and light] will do to the North Atlantic Drift, yet alone the effect of a nice large moisture and sulphur dioxide injection into the upper atmosphere.  The North Atlantic Drift has not been strong for a while and we could have the perfect storm of a record cold Gulf of Mexico source and a freshwater injection at the destination just at a time when the inertia seems to be dropping. |
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Post by poitsplace on Mar 27, 2010 12:52:34 GMT
Thankfully the estimated flow necessary to stop it under normal conditions is something like...the flow of all the rivers of the earth combined...multiplied by 10
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Post by nautonnier on Mar 27, 2010 14:26:28 GMT
Thankfully the estimated flow necessary to stop it under normal conditions is something like...the flow of all the rivers of the earth combined...multiplied by 10 It doesn't have to _stop_ merely alter its path and that may not take much if its a chaotic flow, which it appears it is. |
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Post by douglavers on Mar 27, 2010 21:14:24 GMT
According to Wikipedia, last time Katla erupted seriously, the melt flow was of the order of 300,000 cu.m / sec.
By my admittedly amateur calculations, this is just under 1 cu. km per hour. This amount of water is equivalent to a 5 metre thick layer covering 200 sq km [ mixing and uneven spread mucks this calculation up a bit].
i have no idea how much ice is available to be melted, or whether the meltzone would be localised.
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Post by douglavers on Apr 2, 2010 10:23:15 GMT
Doing a bit more research, the Katla caldera is apparently approximately 10*14 kms, presumably some sort of ovoid, and the ice sheet is about 700 metres thick. Drawing a pretty loose bow around this, this could easily represent 50-80 cu. kms of ice.
Eyjafjallajökull has now developed a new magma fissure, and if I was a gambling type I would say that the chances of Katla joining in were increasing.
The key question seems to be: would 50 cubic kms of fresh water dumped into the surface layer of the North Atlantic around Iceland very quickly be enough to reduce its density sufficiently to force the North Atlantic Drift to "dive" to abyssal depths much earlier than normal?
If I was a European meteorologist, this is something I would be investigating with considerable interest.
Any views?
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Post by curiousgeorge on Apr 2, 2010 10:45:23 GMT
Doing a bit more research, the Katla caldera is apparently approximately 10*14 kms, presumably some sort of ovoid, and the ice sheet is about 700 metres thick. Drawing a pretty loose bow around this, this could easily represent 50-80 cu. kms of ice. Eyjafjallajökull has now developed a new magma fissure, and if I was a gambling type I would say that the chances of Katla joining in were increasing. The key question seems to be: would 50 cubic kms of fresh water dumped into the surface layer of the North Atlantic around Iceland very quickly be enough to reduce its density sufficiently to force the North Atlantic Drift to "dive" to abyssal depths much earlier than normal? If I was a European meteorologist, this is something I would be investigating with considerable interest. Any views? There's an excellent educational video by a on-site volcanologist on Youtube that explains the details of the eruption using physical models of the area, instead of just pretty pictures. He notes that the eruption is not under the ice sheet, but between glaciers and no extensive flooding is expected. Worth watching. About 8 minutes long. www.youtube.com/watch?v=srGnKyL2huU . |
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Post by douglavers on Apr 2, 2010 11:37:20 GMT
Curious George, this what I said earlier:
"Apparently, whenever Eyjafjallajokull has erupted [3 recorded occasions] Katla has erupted within a period of about 1 month to two years.
Independantly of this [more or less] Katla erupts on a 50 to 80 year cycle.
a) Last eruption in 1918 [ ie next eruption is overdue]. It is a very large volcano.
b) It sits in a 10 km caldera underneath a nice fat icecap."
I agree it was a very nice video - but Katla is the volcano to watch.
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Post by curiousgeorge on Apr 2, 2010 12:16:27 GMT
Curious George, this what I said earlier: "Apparently, whenever Eyjafjallajokull has erupted [3 recorded occasions] Katla has erupted within a period of about 1 month to two years. Independantly of this [more or less] Katla erupts on a 50 to 80 year cycle. a) Last eruption in 1918 [ ie next eruption is overdue]. It is a very large volcano. b) It sits in a 10 km caldera underneath a nice fat icecap." I agree it was a very nice video - but Katla is the volcano to watch. My bad. Somehow I thought you were referring to the Eyjafjallajokull event. I agree about Katla. John Seach has some interesting info about it - www.volcanolive.com/katla.html . |
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Post by nemesis on Apr 2, 2010 19:23:09 GMT
Southern Iceland suffered a second crater eruption Wednesday evening, leaving a 100 km rift and forcing evacuations in a nearby town, according to reports reaching here from Reykjavik Thursday. “The formation of the new rift was similar to that at the beginning of the first eruption. This could lead to a stream of lava flowing towards Thorsmork, situated in the south of Iceland between the glaciers Tindfjallajokull and Eyjafjallajokull," one geologist was quoted as saying. The new rift literally opened before the eyes of scientists at the scene, said a report of the Iceland Review said. The split went south towards the crater that was the scene of the first eruption but in a different direction, the report said. The site was closed to all traffic and about 80 people were evacuated by helicopter from Thorsmork, leaving about 25 still in the town, the report added. On March 21, a volcano in Iceland's southern area of the Eyjafjallajokull glacier erupted, some 120 km east of Reykjavik, capital of Iceland. Hundreds of local residents were evacuated for fear of flooding caused by melting glacier waters. The last eruption of a volcano in the same area occurred in the 1820s. From RSOE: hisz.rsoe.hu/alertmap/woalert_read.php?glide=VE-20100402-25558-ISL&cat=dis&lang=eng |
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Post by nemesis on Apr 15, 2010 14:12:48 GMT
Eyjafjallajokull has sent a huge cloud over UK and much of Europe shutting down the airspace. There is wall to wall news coverage but as yet not one mention of the name of this volcano -(dont blame them), And they havent yet managed to tie it to AGW !!
Oh well, all that sulpher should be good for the roses.
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