Richard, Since ice ages have been fairly regular since they began, the theory is that the current arrangement of continents sets up a condition in which Milankovich cycles produce regular ice ages. The Milankovich cycles are certainly regular of course which seems to be something that is needed. The tectonic arrangements just have to be right for them to produce regular ice ages..
Edgar On Saturday, March 22, 2014 8:18:49 AM UTC-4, yanniru wrote: > > Edgar, > > What mechanism do they propose for such an abrupt transition > from extreme warming to cooling? > > I would suggest a stoppage of the Gulf stream as a possibility > based on plate movement. > > But I favor the change in albedo due to an unstable jet stream > known to result from arctic warming. > Richard > > > On Sat, Mar 22, 2014 at 8:03 AM, Edgar L. Owen <[email protected]<javascript:> > > wrote: > > Richard, > > Yes, I noted that in the article. Another explanation I've read for the > current (geologically during the past million or so years) fairly regular > cycle of ice ages is that it is due to the current distribution of > continents, in particular the closing of the Isthmus of Panama which cut > off the Pacific Atlantic ocean interchange, and the isolation of Antarctica > at the S. pole which allows a free circulation of cold water around it the > > ... -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
