On Wed, 22 Aug 2007, Hank Roberts wrote: >> whether the Antarctic situation might resemble the postulated 'ice-dam'... > > I asked the same thing over at Stoat a while back -- left some notes > and cites in the 'Why Study Antarctica' thread there, after coming > across a bunch of articles about water moving under the ice, liquid > water found in large voids below the ice when drilling through the > ice, rapid drumlin formation under the Antarctic ice, and then taking > another look at the Channeled Scablands. > > All these lovely drawings of "meltwater lakes dammed up behind ice" > seem to have been done before people started looking at the way melt > water goes down below the ice.
Oh dear, I'd better answer then :-) As far as I know, the laurentide ice dams were holding back vast lakes. There is nothing analogous to that in Antarctica now. As for the sub-ice flow now in Ant: I'm (fairly) sure that this is in areas where the ice grounds below sea level and the overpressure is low. Anthing above sea level with 1km of ice above it is going to be pretty water tight. I think. -W. William M Connolley | [EMAIL PROTECTED] | http://www.antarctica.ac.uk/met/wmc/ Climate Modeller, British Antarctic Survey | 07985 935400 -- This message (and any attachments) is for the recipient only. NERC is subject to the Freedom of Information Act 2000 and the contents of this email and any reply you make may be disclosed by NERC unless it is exempt from release under the Act. Any material supplied to NERC may be stored in an electronic records management system. --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
