On Jan 17, 2010, at 9:34 PM, Graydon wrote: > On Sun, Jan 17, 2010 at 08:41:37PM -0500, P. J. Alling scripsit: >> On 1/17/2010 7:15 PM, Graydon wrote: >>> Especially for what, exactly, you consider the "medieval warm period". >> The period around 1000 AD when the Vikings were settling Greenland and >> Wine grapes were growing in Scotland. > > Not global; these were mostly confined to Europe, not even the whole > North Atlantic basin. Best available evidence is that the global mean > temperature was below the current level during that period.
That's largely revisionist science based on fudged data. (Politics moves people to do strange things.} More recent studies suggest that the global mean temperature during that period was considerably higher than it is today. Paul > >>>>> If it gets much hotter or much drier, nasty things happen like "the >>>>> Asian monsoon rains only happen some years or shut down entirely". >>>>> >>>> Once again unwaranted assumption. There's no record that this ever >>>> happened and it cannot be precdicted from current data. >>>> >>> There certainly are records of this happening; monsoons *have* >>> failed. (This is the sort of thing Chinese imperial historians >>> tended to write down.) >>> >>> For instance, this year's monsoon is considered to have failed in >>> India; see: >>> <http://www.indianexpress.com/news/failed-monsoon-leads-to-largescale-migration-in-kutch-tehsils/542071/> >>> >> >> Seems it's a pattern that's happend in the past. I'm sorry I put that >> poorly. There's no credence that general global warming has had any >> effect on this. > > Why not? The mechanism relating sea surface temperature to climate is > pretty well understood these days. This is why it matters if it's an El > Niño or La Niña year. > >> I hate to say this but it is in a peer reviewed publication. I expect >> that if they got their thermo wrong it will eventually be proven. >> However so far not. > > arxiv.org is not a peer-reviewed publication! (Nor is peer-review a > guarantee of correctness!) > > Try <http://rabett.blogspot.com/2008/02/light-dawns-and-sun-sets-g.html> > for a simple explanation of how the atmospheric equilibrium works. > (This is the same stuff that was used to (we now know correctly) predict > things about Titan's atmosphere back in the 1950s based on the observed > temperature.) > > -- Graydon > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
