Surface Activity on the South-Central Greenland Ice Sheet
Jezek, K.C. 2012. Surface elevation and velocity changes on the south-central Greenland ice sheet: 1980-2011. Journal of Glaciology 58: 1201-1211.
Bringing still more data to bear upon the issue, Jezek extended through 2011 "an ice-sheet elevation and surface velocity record across three measurement networks established in south-central Greenland by The Ohio State University in 1980/81," where "surface parameters are derived from repeat GPS in situ observations," and where elevations are "measured by airborne laser altimetry and by the Ice, Cloud and land Elevation Satellite (ICESat)." In doing so the Ohio State University (USA) researcher reports that the most recent data show that thinning rates are slowing at several sites just east of the divide, and that the elevation at the divide continues to increase.
"These results," in the words of Jezek, "show that the Greenland ice sheet is changing from terminus to divide," and that "measurement strategies designed to predict future changes and to estimate volumetric changes across the ice sheet need to appropriately cover the entirety of the ice sheet [italics added]." Until they do, future estimates of change should be assumed with caution.
Johannessen, O.M., Khvorostovsky, K., Miles, M.W. and Bobylev, L.P. 2005. Recent ice-sheet growth in the interior of Greenland. Science 310: 1013-1016.
Zwally, H.J., Jun, L.I., Brenner, A.C., Beckley, M., Cornejo, H.G., Dimarzio, J., Giovinetto, M.B., Neumann, T.A., Robbins, J., Saba, J.L., Donghui, Y.I. and Wang, W. 2011. Greenland ice sheet mass balance: distribution of increased mass loss with climate warming: 2003-07 versus 1992-2002. Journal of Glaciology 57: 88-102.