Yep, thanks John, that's the sort of report I have seen. I'd wondered if anyone had started trying to creep a submersible up to the edge where the ice starts to float, to detect whether there's meltwater coming out (and ice caves melting out). I'd think sensors there could help understand whether the volume of meltwater is changing over time and how it varies with other things.
I've seen a lot of wonderful imagery of the sea bottom under the ice (and under where the ice used to be) -- just curious how far they'd tried to move the devices toward where the ice is grounded, where meltwater could be distinguished from surrounding seawater as it emerges. On Feb 7, 10:12 am, "John McCormick" <[EMAIL PROTECTED]> wrote: > On Feb 3, 1:53 pm, "hank roberts" <[EMAIL PROTECTED]> wrote: > > > William, can you talk about the lakes and rivers below the ice cap? > > Hank, you might be interested in accessing the following link to > Science: > > http://sciencenow.sciencemag.org/cgi/content/short/2007/206/1 > > The following is an excerpt: > > Scientists have had major difficulties figuring out what causes > glaciers to break away from land because they don't have access to the > bottom where the action is, says Rob Larter, a marine geophysicist > with the British Antarctic Survey at the University of Cambridge in > the U.K. "All proposed mechanisms for fast glacier flow require an > ample supply of water at the ice bed," he wrote from the ship > yesterday. Sonar imaging has revealed what look like meltwater > channels beneath the Antarctic ice sheet. And last year, researchers > spotted signs of water moving beneath the Antarctic ice sheet in > satellite data (ScienceNOW, 19 April 2006). > > John McCormick --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
