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uk.sci.weather (UK Weather) (uk.sci.weather) For the discussion of daily weather events, chiefly affecting the UK and adjacent parts of Europe, both past and predicted. The discussion is open to all, but contributions on a practical scientific level are encouraged. |
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#1
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I understand that Mt St Helens is likely to blow any day now - any thoughts
on how this will change our weather this Autumn, or will it have to be a huge event to have any effect here ? live web cam of the mountain at http://www.fs.fed.us/gpnf/volcanocams/msh/ -- Paul Crabtree Brampton N.E. Cumbria 117m ASL Climatological Station 7076 http://www.bramptonweather.co.uk |
#2
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In article ,
says... I understand that Mt St Helens is likely to blow any day now - any thoughts on how this will change our weather this Autumn, or will it have to be a huge event to have any effect here ? Just had a minor eruption which started about half an hour ago if anybodies interested. http://www.fs.fed.us/gpnf/volcanocams/msh/ -- Alan LeHun |
#3
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On Mon, 4 Oct 2004 18:26:19 +0100, Alan LeHun wrote:
Just had a minor eruption which started about half an hour ago if anybodies interested. http://www.fs.fed.us/gpnf/volcanocams/msh/ Fascinating ; thanks for that link. However looks pretty quiet at the moment! |
#4
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![]() ================================================== ================== This posting expresses the personal view and opinions of the author. Something which everyone on this planet should be able to do. ================================================== ================== I was pondering this this morning. If debris gets injected into the stratosphere in any large quantities then I would say that next summer could be a lot cooler (and perhaps wetter) than normal. Major volcano eruptions tend to cool the earth temporarily. The eruption could be too late now to give us a cold winter as it takes time for the debris to spread out in the upper atmosphere. Will. -- " A cup is most useful when empty " ------------------------------------------------------------------------------- A COL BH site in East Dartmoor at Haytor, Devon 310m asl (1017 feet). mailto: www: http://www.lyneside.demon.co.uk DISCLAIMER - All views and opinions expressed by myself are personal and do not necessarily represent those of my employer. ------------------------------------------------------------------------------- Paul Crabtree wrote in message ... I understand that Mt St Helens is likely to blow any day now - any thoughts on how this will change our weather this Autumn, or will it have to be a huge event to have any effect here ? live web cam of the mountain at http://www.fs.fed.us/gpnf/volcanocams/msh/ -- Paul Crabtree Brampton N.E. Cumbria 117m ASL Climatological Station 7076 http://www.bramptonweather.co.uk |
#5
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![]() "Will" wrote in message ... I was pondering this this morning. If debris gets injected into the stratosphere in any large quantities then I would say that next summer could be a lot cooler (and perhaps wetter) than normal. Major volcano eruptions tend to cool the earth temporarily. The eruption could be too late now to give us a cold winter as it takes time for the debris to spread out in the upper atmosphere. .... the 1980 event ejected material into the stratosphere, but the primary thrust of the explosion was horizontal rather than vertical, and if I understand the data correctly, the stratospheric loading from that was minimal. As you say, whether this one would do something different will be interesting to say the least. However, I wonder if Mt. St.Helens is a bit far north for major long-lasting effects anyway: I understand that to have world-wide impact, the event would need to be in the tropical/sub-tropical belt? However, would be glad to be corrected if anyone has got more on this. Martin. |
#6
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![]() "Martin Rowley" wrote in message ... ... the 1980 event ejected material into the stratosphere, but the primary thrust of the explosion was horizontal rather than vertical, and if I understand the data correctly, the stratospheric loading from that was minimal. As you say, whether this one would do something different will be interesting to say the least. However, I wonder if Mt. St.Helens is a bit far north for major long-lasting effects anyway: I understand that to have world-wide impact, the event would need to be in the tropical/sub-tropical belt? However, would be glad to be corrected if anyone has got more on this. Just to follow up on this.... these higher latitude events can have *regional* / local effects of course - here a note I have of the Laki event with dates given: 1783/84: Icelandic volcanic eruption (Laki): Primary eruptions (five) from June 8th to July 8th, 1783(60% of the total volume of ejection), but minor eruptions occurred until early February, 1784. A major event, with huge production of sulphur & acid products. The majority of emissions are thought to have been confined to the troposphere, but the initial ejections of each of the five major events did penetrate the tropopause into the stratosphere. The intense period of eruption tallied with contemporary reports across Europe of a blue haze or dry-fog in the atmosphere, damage to vegetation and occurrence of respiratory problems. These effects are consistent with increased atmospheric loading of acid aerosols, particularly sulphates. Because of the lack of major stratospheric impact, there is controversy surrounding this event: For Iceland itself, the following winter (1783/84) was known as the 'Famine Winter': 25% of the population died. However, did it really cause changes to the regional/European climate in the years 1783, 1784 etc? Martin. |
#7
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However, did it really cause changes to the regional/European climate in
the years 1783, 1784 etc? Yes,see http://www.cosis.net/abstracts/EGU04...04-J-05244.pdf and Atmospheric impact of the 1783-1784 Laki Eruption: Part II Climatic effect of sulphate aerosol E. J. Highwood and D. S. Stevenson ACP V3 Page(s) 1177-1189. SRef-ID: 1680-7324/acp/2003-3-1177 freely available at http://www.cosis.net/members/journal...j_id=2&i_id=28 -- regards, david (add 17 to waghorne to reply) |
#8
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![]() "Waghorn" wrote in message ... However, did it really cause changes to the regional/European climate in the years 1783, 1784 etc? Yes,see http://www.cosis.net/abstracts/EGU04...04-J-05244.pdf and Atmospheric impact of the 1783-1784 Laki Eruption: Part II Climatic effect of sulphate aerosol E. J. Highwood and D. S. Stevenson ACP V3 Page(s) 1177-1189. SRef-ID: 1680-7324/acp/2003-3-1177 freely available at http://www.cosis.net/members/journal...j_id=2&i_id=28 .... many thanks for those: I originally did not query the effect, then I found a couple of years ago some remarks (haven't got the refs) that cast doubt ... and the following in the CRU extract also is confusing: " Benjamin Franklin, in 1783, first postulated that major volcanic eruptions affect climate, after the eruption of the Laki volcano in Iceland. Ironically, most of the ejected material from this eruption remained in the lower parts of the atmosphere, so Franklin had the right idea but the wrong volcano. " These extracts you have posted though are later than the CRU information sheet, so obviously follow-up work has confirmed the original (i.e. Franklin) ideas for Laki specifically. Whatever, a fascinating area of research and one of the teasing 'variables' in the GW debate! Martin. -- FAQ & Glossary for uk.sci.weather at:- http://homepage.ntlworld.com/booty.weather/uswfaqfr.htm |
#9
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"Waghorn" wrote in message
However, did it really cause changes to the regional/European climate in the years 1783, 1784 etc? No, see, sulphur is not easily converted to sulphuric acid. I don't know the whys and wherefores but the underlying tendency to describe sulphur oxides as sulphuric acid, while irritating from news reporters, is in chronic bad taste from scientific journals. One would suspect that there is an abject need for it to be sulphuric acid to fit their needs and explanations. http://www.cosis.net/abstracts/EGU04...04-J-05244.pdf Is it anything to do with the fact that the peresence of sulphur dioxide in dilute quantities is beneficial? Or does it not fit the climate models or what? -- Posted via Mailgate.ORG Server - http://www.Mailgate.ORG |
#10
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In article ,
Martin Rowley writes: However, I wonder if Mt. St.Helens is a bit far north for major long-lasting effects anyway: I understand that to have world-wide impact, the event would need to be in the tropical/sub-tropical belt? However, would be glad to be corrected if anyone has got more on this. ISTR HH Lamb saying that in "Climate, History and the Modern World." -- John Hall You can divide people into two categories: those who divide people into two categories and those who don't |
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