A swift trawl through some of the Open Access Journals has brought up this gem from The Cryosphere:
Global glacier changes: a revised assessment of committed mass losses and sampling uncertainties
http://scienceblogs.com/stoat/2013/09/30/ar5-cursory-review-of-chapter-4-cryosphere-mass-balance-of-antarctica/ see comments 8&9.) Thanks, William.
Further comment: since it is a well established and credible blog, the discussion continues at WC's site - no point in duplicating effort. Please go there and read on...