Narrowing the gap: A consensus estimate of glacier mass wastage for 2003-09 C53B-0848 Mass wasting of glaciers outside of the ice sheets contributes greatly to present rates of sea level rise. There is however a large disagreement between recent global estimates derived from satellite gravimetry (Jacob et al., 2012) and those derived from the interpolation of local-scale mass balance and geodetic measurements (Cogley et al, 2009). Adding to this uncertainty are poorly constrained estimates of mass changes of the peripheral glaciers surrounding the Greenland and Antarctic Ice Sheets. Here we compare alternative estimates of regional glacier mass changes for 19 glacierized regions and derive new estimates for the peripheral glaciers of Greenland and Antarctica using ICESat. We identify uncertainties and potential biases in existing global assessments and show how the large gap between them can be narrowed by combining results from the best available techniques in each glacier region.
Alex Gardner1, 2, Geir Moholdt3, J. G Cogley4, Anthony A Arendt5, John M Wahr6 1. Graduate School of Geography, Clark University, Worcester, MA, USA; 2. Atmospheric, Oceanic and Space Sciences, Univ of MIchigan, Ann Arbor, MI, USA; 3. Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, La Jolla, CA, USA; 4. Department of Geography, Trent University, Peterborough, ON, Canada; 5. Geophysical Institute, University of Alaska, Fairbanks, Fairbanks, AK, USA; 6. Department of Physics and Cooperative Institute for Environmental Studies, University of Colorado at Boulder, Boulder, CO, USA