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From: Bob Mann on 12 Nov 2009 09:59 "don (Calgary)" <hd.flhr(a)telus.net> wrote in news:cg3nf5lgkvnrbnh6kftbu5m0nsumkmum77(a)4ax.com: >>Polar ice is still receding. > > So is my hair line! <g> > > As I noted for someone else, there are more variables than just the > average temperature of the world impacting the polar ice. > > True but as the sea level rises that will also disrupt climate. -- Bob Mann Cap'n, ah need moor pow'r.
From: Bob Mann on 12 Nov 2009 10:00 "J. Clarke" <jclarke.usenet(a)cox.net> wrote in news:hdg2vo0b0p(a)news2.newsguy.com: > Which doesn't mean that it's not cooling. > It kind of does if you really think about it. -- Bob Mann Cap'n, ah need moor pow'r.
From: J. Clarke on 12 Nov 2009 10:07 Bob Mann wrote: > "don (Calgary)" <hd.flhr(a)telus.net> wrote in > news:cg3nf5lgkvnrbnh6kftbu5m0nsumkmum77(a)4ax.com: > >>> Polar ice is still receding. >> >> So is my hair line! <g> >> >> As I noted for someone else, there are more variables than just the >> average temperature of the world impacting the polar ice. >> >> > > True but as the sea level rises that will also disrupt climate. If it rises much.
From: .p.jm. on 12 Nov 2009 10:33 On Thu, 12 Nov 2009 07:22:52 +0000, totallydeadmailbox(a)yahoo.co.uk (The Older Gentleman) wrote: >J. Clarke <jclarke.usenet(a)cox.net> wrote: > >> The glaciation cycle is about 120,000 years. The >> southernmost extent of the Wisconsonian glaciers was a little south of where >> Indianapolis is now, 18,000 years ago. In previous glaciation cycles they >> had been a bit farther south. > ><fx: suspicion that Clarke knows rather more than the rest of us about >glaciers> We bow to his superior age ;-) -- Click here every day to feed an animal that needs you today !!! www.theanimalrescuesite.com/ Paul ( pjm @ pobox . com ) - remove spaces to email me 'Some days, it's just not worth chewing through the restraints.' 'With sufficient thrust, pigs fly just fine.' HVAC/R program for Palm PDA's Free demo online at www.pmilligan.net/palm/ Free 'People finder' program now at www.pmilligan.net/finder.htm
From: Rob Kleinschmidt on 12 Nov 2009 11:21
On Nov 11, 11:39 pm, "J. Clarke" <jclarke.use...(a)cox.net> wrote: > Rob Kleinschmidt wrote: > > The closing of the isthmus of Panama by tectonic activity > > only a few million years ago drastically altered global oceanic > > currents and with them, global climate. > > And yet 30,000 years ago, well after that closing, Ireland was buried under > glaciers. Well yeah. And lots of theories attribute the current series of ice ages to exactly that, (closing of the isthmus and creation of the north Atlantic ocean currents). > > We're unlikely to return to conditions that existed prior to > > the joining of the American continents. > > We are? I'm sorry, but the normal state of the planet is a much warmer > climate than at present. Ice ages have existed off and on at various > periods but they make up a tiny fraction of the history of the planet. Right, but the normal state of the planet, not too surprisingly depends on the current configuration of it's continents. There were actually two significant changes in the last 25M years. Besides the closing of the Panama isthmus, there was also the opening of the strait of Magellan, creating the circumpolar current in the southern ocean. Whatever conditions we go to will be a new mix of warm and cold spots, which will most likely not be the same mix that we saw 25mya. > > If something > > else did alter climate it's anybody's guess where it would > > go. > > While this is true to some extent, the way to bet is that it would go to > where is has been over most of its existence. It's been all over the place is where it's been. Mostly, it's been a mix of warm moderate oceanic climates and the harsher, more extreme climates found in continental interiors. Continental climates correspond roughly to periods of large supercontinents. > > Conditions 25m years ago can't really be considered > > a norm anymore because the geography of the earth has > > in fact changed very significantly even without the continents > > moving very far. > > No, conditions 25M years ago are snapshot. How about conditions from the > end of the Karoo 260 million years ago to the beginning of the current one? > That's about ten times as long as the Antarctic glaciation and about a > hundred times as long as the Northern Hemisphere glaciation, and during > that time the continents did experience significant movement. And conditions at the end of the Karoo are relevant to the current world because ? It's not especially about motion per se. It's about continents joining together and breaking apart along with the resultant mountain building and changes in oceanic circulation. |