tag:blogger.com,1999:blog-9959776.post3734458612065529489..comments2024-02-15T04:42:41.606+00:00Comments on James' Empty Blog: o noes!James Annanhttp://www.blogger.com/profile/04318741813895533700noreply@blogger.comBlogger11125tag:blogger.com,1999:blog-9959776.post-31350375299512959822008-05-14T06:00:00.000+01:002008-05-14T06:00:00.000+01:00About 10-12 days, roughly speaking. That is just b...About 10-12 days, roughly speaking. That is just based on 25mph average wind (<A HREF="http://www.climate-charts.com/World-Climate-Maps.html#wind-speed" REL="nofollow">here</A>) and a very rough estimate of distance (6500m). So...yes that will be it, I reckon. Enjoy the show (and take some pictures)!James Annanhttps://www.blogger.com/profile/04318741813895533700noreply@blogger.comtag:blogger.com,1999:blog-9959776.post-13679652796452802262008-05-14T05:42:00.000+01:002008-05-14T05:42:00.000+01:00If the ash was entrained into the roaring forties,...If the ash was entrained into the roaring forties, how long would it take to travel ~210 degrees (e.g. just over halfway) around Antarctica?<BR/><BR/>I ask because we had the most amazingly red sunrise this morning, and there are no fires...C W Mageehttps://www.blogger.com/profile/09706100504739548720noreply@blogger.comtag:blogger.com,1999:blog-9959776.post-15408178226023367922008-05-09T23:37:00.000+01:002008-05-09T23:37:00.000+01:00The news reports I have read indicate very little ...The news reports I have read indicate very little SO2 production.David B. Bensonhttps://www.blogger.com/profile/02917182411282836875noreply@blogger.comtag:blogger.com,1999:blog-9959776.post-34869195853379886532008-05-08T13:33:00.000+01:002008-05-08T13:33:00.000+01:00Well at least the 1900-ish ones could potentially ...Well at least the 1900-ish ones could potentially be visible in the observational record...James Annanhttps://www.blogger.com/profile/04318741813895533700noreply@blogger.comtag:blogger.com,1999:blog-9959776.post-19336614217951393352008-05-08T12:02:00.000+01:002008-05-08T12:02:00.000+01:00OK, so I got curious.Here are some googlicious hig...OK, so I got curious.<BR/>Here are some googlicious high latitude eruptions:<BR/><BR/>Ksudach VEI 6 AD 240 (http://cat.inist.fr/?aModele=afficheN&cpsidt=5976131)<BR/><BR/>Kurile Lake VEI 7 14C age 7618 BP (http://www.geochronometria.pl/pdf/geo_20/geo_20_15.pdf)<BR/><BR/>Alaska Fisher lake VEI 6 9100BP <BR/><BR/>From http://www.volcano.si.edu/world/largeeruptions.cfm<BR/>Lvinaya Past Kuril Islands VEI 6+ 7480 +/- 50 (note contemporaneous Pinatubo eruption)) <BR/>Karymsky Kamchatka VEI6 6600BC<BR/>Khangar kamchatka VEI 65700BC<BR/>Black Peak Alaska VEI 6 1900<BR/>Veniaminof Alaskla VEI6 1750bc<BR/>Aniakchak 1645BC VEI6<BR/>Okmok Alutian 100BC<BR/>Churchill Alaska VEI6 60AD<BR/>Churchill Alaska VEI6 700AD<BR/>Novarupta Alaska VEI 6 jun-oct 1912<BR/><BR/>1890 BC Cerro Hudson VEI 6 (45S in Chile- analog to current eruption?)<BR/>4750 BC Cerro Hudson VEI 6 (45S in Chile- analog to current eruption?)C W Mageehttps://www.blogger.com/profile/09706100504739548720noreply@blogger.comtag:blogger.com,1999:blog-9959776.post-32977423006974640232008-05-08T08:17:00.000+01:002008-05-08T08:17:00.000+01:00"all big volcanoes have historically caused overal..."all big volcanoes have historically caused overall cooling"<BR/><BR/>Don't forget that there will be a reporting bias there, since you don't get high impact journal papers for finding a lack of correlation. IN fact, I think I recall a recent EOS saying that people were using the climate record to look for big eruptions.<BR/><BR/>If you actually want to look into the possibility of high lat eruptions not cooling, one way of doing it would be to get dates for alaska and kamchatka calderas of appropriate size, then check the appropriate greenland ice cores for ask, S, but no cooling.C W Mageehttps://www.blogger.com/profile/09706100504739548720noreply@blogger.comtag:blogger.com,1999:blog-9959776.post-29844199118522792342008-05-08T02:08:00.000+01:002008-05-08T02:08:00.000+01:00Stratosphere goes up to about 50km, with mesospher...Stratosphere goes up to about 50km, with mesosphere, ionosphere, exosphere above. Of course they are not spheres at all, rather spherical shells.<BR/><BR/>I had wondered about the longwave trapping effect myself. There must be some effect, I'm sure. But it is presumably small compared to the solar shading, since all big volcanoes have historically caused overall cooling. Mind you I don't know how many big high latitude winter volcanoes there have been. Presumably the ash will also darken any snow and ice that it lands on, and warm things up that way. But I'm basically guessing here.James Annanhttps://www.blogger.com/profile/04318741813895533700noreply@blogger.comtag:blogger.com,1999:blog-9959776.post-18841061416893354002008-05-08T00:40:00.000+01:002008-05-08T00:40:00.000+01:00Also, the smithsonian is now reporting an ash plum...Also, the smithsonian is now reporting an ash plume height of up to 30 km!<BR/><BR/>Does the stratosphere have a top?C W Mageehttps://www.blogger.com/profile/09706100504739548720noreply@blogger.comtag:blogger.com,1999:blog-9959776.post-65383722635459668472008-05-08T00:33:00.000+01:002008-05-08T00:33:00.000+01:00Can a high latitude winter volcano cause warming b...Can a high latitude winter volcano cause warming by trapping outgoing radiation? Or does that depend on the F, Cl, SO2, etc concentrations?<BR/><BR/>Whatever climate does, my money is on a whooping great big ozone hole next spring.C W Mageehttps://www.blogger.com/profile/09706100504739548720noreply@blogger.comtag:blogger.com,1999:blog-9959776.post-1859323330825053352008-05-07T23:23:00.000+01:002008-05-07T23:23:00.000+01:00I think it is. Or rather, this link suggests so (t...I think it is. Or rather, <A HREF="http://earthobservatory.nasa.gov/Newsroom/NewImages/images.php3?img_id=18020" REL="nofollow">this link</A> suggests so (together with <A HREF="http://www-das.uwyo.edu/~geerts/cwx/notes/chap01/tropo.html" REL="nofollow">this one</A>, which was just a random google search). The question is how much and for how long...James Annanhttps://www.blogger.com/profile/04318741813895533700noreply@blogger.comtag:blogger.com,1999:blog-9959776.post-87586855936239414032008-05-07T17:01:00.000+01:002008-05-07T17:01:00.000+01:00Does anybody know if this a big enough eruption to...Does anybody know if this a big enough eruption to bring sulphates to the stratosphere?Unknownhttps://www.blogger.com/profile/03903792686424460325noreply@blogger.com