I made the following comment at Eli's blog; perhaps some of you may have comments in the context of this thread:
"Contra to Jim Hansen's concern that we may see significant ice sheet changes on a scale of less than a century, I note that a 2000 paper by UCLA's Glen MacDonald concluded that the eurasian arctic was 4-12 deg F warmer in summer for the period from 7000 to 9000 ybp - www.sscnet.ucla.edu/geog/downloads/634/269.pdf. Presumably it was also much warmer in Greenland at that time, but it seems that we did not lose Greenland. "The only discussion I could find of this paper is by Pat Michaels. http://www.worldclimatereport.com/index.php/2006/05/25/more-evidence-of-arctic-warmth-a-long-time-ago/; http://www.worldclimatereport.com/index.php/2007/05/02/arctic-ice-and-polar-bears/. Does anyone have any thoughts on how this and other evidence for a warmer early Holocene fits into Hansen's concern? Is there a dispute over the degree, location or duration of the warmth of that period, or some other explanation?" On Aug 2, 10:35 am, Hank Roberts <[EMAIL PROTECTED]> wrote: > Just found > this:http://www.geolsoc.org.uk/gsl/geoscientist/geonews/page1186.html > > "Recent observations suggest that major changes in parts of the ice > sheets are taking place over timescales of a few years to decades, not > thousands of years as traditionally believed" explains Jonathan Bamber > at the University of Bristol, who has recently published a paper with > colleagues examining the growing evidence that there is still much we > don't understand about ice sheets. "These changes were not predicted > by numerical models and the underlying causes are uncertain." --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups Global Change ("globalchange") newsgroup. Global Change is a public, moderated venue for discussion of science, technology, economics and policy dimensions of global environmental change. Posts will be admitted to the list if and only if any moderator finds the submission to be constructive and/or interesting, on topic, and not gratuitously rude. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/globalchange -~----------~----~----~----~------~----~------~--~---
