THIS PROPOSAL SEEKS TO INVESTIGATE THE IMPACT OF SURFACE MELT WATER ON FAST-FLOWING MARINETERMINATING OUTLET GLACIERS OVER THE GREENLAND. WE WILL EXPAND UPON WORK EXAMINING HYDROLOGIC-INDUCED SHEAR WEAKENING OVER JAKOBSHAVN ISB MARGINS. WE HAVE FOUND THAT REDUCTION IN SHEAR DUE TO MELT WATER INJECTION FROM PONDED WATER-FILLED CREVASSES ALONG THE FLANKS OF JAKOBSHAVN ACCELERATE EXTRA-MARGINAL ICE RESULTING IN ENHANCE MASS FLUX INTO THE MAIN TROUGH. WE HAVE EVALUATED THIS PROCESS THROUGH SEVERAL INVESTIGATIONS THAT USED NUMERICAL ICE FLOW MODELS TO QUANTIFY THE IMPACT OF REDUCED BASAL LUBRICATION RESULTING FROM DRAINAGE FROM WATER-FILLED CREVASSES. GIVEN SOME OF THESE WATER-FILLED CREVASSE SYSTEMS DRAIN OVER SHORT PERIODS (<DAY) THEY CAN INDUCE BOTH A VISCOUS AND ELASTIC RESPONSE IN THE ICE FLOW. WE USED A VISCOELASTIC NUMERICAL MODEL TO ASSESS THIS IMPACT. WE USED A RANGE OF VISIBLE IMAGERY SPANNING SPATIAL RESOLUTIONS FROM SUB-METER (QUICKBIRD) TO TENS OF METERS (LANDSAT) TO NOT ONLY ASSESS THE AREAL EXTENT OF A DECADAL PERIOD BUT WE UTILIZE ALL AVAILABLE VISIBLE IMAGERY TO COMPILE A DECADAL SCALE RECORD OF HYDROLOGIC STATE (DRAINED OR FILLED) FOR ALL WATER-FILLED CREVASSE GROUPS. WE SEEK TO EXPAND UPON THIS WORK AND EXAMINE THE IMPACT OF MELT WATER INJECTION FROM VARIOUS HYDROLOGIC STRUCTURES (LAKES AND WATER FILLED CREVASSES) IN OTHER MAJOR MARINE-TERMINATING GLACIER SUCH AS HELHEIM ZACCHARIE ISSTROM PETERMANN HUMBOLT AND ATTEMPT TO ABSTRACT BASIC BOUNDARY CONDITIONS (BEDROCK SLOPE THICKNESS WIDTH AND LENGTH) ACROSS THESE VARIED OUTLET GLACIER SYSTEMS AND EXPLORE HOW IDEALIZED MODELS INTENDED TO REPRESENT FAST FLOWING GLACIER SYSTEMS WITH GENERALIZED BOUNDARY CONDITIONS RESPOND TO HYDROLOGIC PERTURBATIONS AS A FUNCTION OF TYPE AND LOCATION WITHIN ICE STREAMS (I.E. MEDIAL LATERAL OR DISTAL). WE WILL EXAMINE SENSITIVITY OF OUTLET GLACIERS TO MELT WATER PERTURBATION WHOSE FORCE-BALANCE ARE INFLUENCED BY SHEAR MARGINS (ICE AND ROCK BOUND MARGINS). WE WILL ACCOMPLISH THESE TASKS THROUGH NUMERICAL PLANE-MODELS DEVELOPED USING THE ICE SHEET SYSTEM MODEL (ISSM) TO EXPLORE THESE ISSUES. WE INTEND TO SUPPORT NASA S INTEREST IN ASSESSING THE EFFECTIVENESS AND UTILIZATION OF NASA SUPPORTED FIELD ASSETS OVER THE GREENLAND ICE SHEET. NASA CURRENTLY SPENDS ~ 3.2 MILLION PER ANNUM ON SUPPORTING FIELD OPERATIONS ACROSS THE GREENLAND ICE SHEET. I ENDEAVORS TO COLLATE INFORMATION ABOUT RESEARCH ACTIVITIES OVER THE LAST COUPLE DECADES AND ASSESS THE RANGE OF CRITICAL RESEARCH OBJECTIVES ADDRESSED AT EACH OF THESE INSTALLATIONS. A COMPREHENSIVE REPORT AND PUBLICATION WILL BE DERIVED THAT ENUMERATES THESE ACTIVITIES AND PROVIDES DIAGNOSTIC ASSESSMENTS OF THE RESEARCH GOALS ADDRESSED AND THOSE STILL UNDERSERVED. LASTLY WE INTEND TO CONTINUE THE EFFORT TO PROCESS GLOBAL POSITIONING SYSTEM (GPS) ARRAY DATA BROADLY DISTRIBUTED ALONG A FLOW-LINE IN THE SWISS CAMP REGION. DATA FROM THIS ARRAY FROM 1996- 2010 HAS BEEN RETRIEVED FROM A COMPREHENSIVE ARCHIVE AT NASA GODDARD. WE WILL COMPLETE THE DATA PROCESSING FROM 2010 TO THE PRESENT AND ANALYZE ICE ACCELERATIONS OVER THIS PERIOD TO BETTER UNDERSTAND HOW MELT WATER DRAINAGE AFFECTS THE DYNAMIC RESPONSE THROUGH EVOLUTION OF THE SUBGLACIAL DRAINAGE SYSTEM. THIS EFFORT IS AN ONGOING COLLABORATION WITH DR. JAY ZWALLY (NASAGODDARD) AND MAY PROVIDE ADDITIONAL SYNERGISTIC RESEARCH ACTIVITIES THAT SUPPORT THE OVERALL RESEARCH OBJECTIVES OF THIS PROPOSAL.