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FOR THIS PURPOSE  WE PROPOSE THREE RESEARCH GOALS: (1) TO QUANTIFY DIFFERENCES IN ALTIMETRY-DERIVED SURFACE ELEVATION ESTIMATES BETWEEN DIFFERENT SYSTEMS CAUSED BY GEOPHYSICAL FACTORS  SUCH AS SIGNAL PENETRATION DEPTH AND SLOPE-INDUCED ERRORS  OVER AREAS OF THE GIS WITH VARIABLE METEOROLOGICAL CONDITIONS; (2) TO MEASURESHORT-TERM CHANGES IN ICE VOLUME OVER THE SAME REGIONS IN ORDER TO BOTH STUDY THE PROPAGATION OF ICE THINNING TOWARDS THE ICE SHEET INTERIOR AND ASSESS ALTIMETRY SYSTEM RESPONSE TO ANNUAL SIGNALS (I.E. SEASONAL THINNING AND WINTER ACCUMULATION); AND (3) RECONSTRUCT AND LINK LONG-TERM TIME SERIES FROM REPEATED OBSERVATIONS MADE BY ICESAT  CRYOSAT-2  AND COMPLEMENTARY AIRBORNE ALTIMETRY DATA ACQUIRED OVER THE MARGINS OF THE GIS. WE INTENT IS TO COMPARE AIRBORNE LASER AND RADAR ALTIMETRY WITH ALTIMETRY DATA ACQUIRED BYICESAT FOR THE PERIOD OF 2004-2009  AND WITH DATA ACQUIRED BY CRYOSAT-2 FOR THE PERIOD OF 2011-2015. 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