ALPINE GLACIERS AROUND THE GLOBE ARE RETREATING RAPIDLY DUE TO CLIMATE WARMING. THIS LOSS OF ICE FROM ITS LONG TERM STORAGE ON THE LANDSCAPE IS TRANSFERRED VIA MELTWATER RUNOFF TO THE OCEANS INCREASING GLOBAL SEA LEVELS. TRACKING THE MAGNITUDE AND RATE OF GLACIER VOLUME SHRINKAGE IS KEY TO UNDERSTANDING THE RATE OF CURRENT SEA LEVEL RISE AND IMPORTANT TO DEVELOPING PREDICTIVE MODELS OF FUTURERISE. AERIAL AND SATELLITE REMOTE SENSING OFFER THE ONLY PRACTICAL APPROACH FOR ASSESSING GLACIER VOLUME CHANGE OVER BROAD REGIONS. A VARIETY OF METHODS ARE USED TO MAP THE LANDSCAPE INCLUDING IMAGING RELYING ON OPTICAL SENSORS TO TAKE `PICTURES LASERS (LIDAR) AND MICROWAVE SENSORS. THE FIRST TWO METHODS REQUIRE CLOUD-FREE CONDITIONS A RELATIVELY EPHEMERAL CONDITION IN MANY HIGH ALPINE REGIONS.MICROWAVE EMITTERS/SENSORS ARE AN ATTRACTIVE ALTERNATIVE BECAUSE THEY DO NOT REQUIRE CLEAR SKIES (OR DAYLIGHT). SATELLITE MICROWAVE SENSORS HAVE PROVED TO BE VERY USEFUL IN STUDIES OF ICE SHEETS AND ICE CAPS BUT OVER COMPLEX TERRAIN IN MOUNTAINOUS REGIONS THE SIGNAL CAN BE OBSCURED BY MULTIPLE INTERFERING REFLECTIONS OFF THE HIGH RELIEF LANDSCAPE.THIS PROPOSAL TESTS THE CAPABILITY OF AN AIRBORNE MICROWAVE SENSOR (GLISTIN-A) TO MAP THE ALPINE TOPOGRAPHY AND GLACIER SURFACES. BECAUSE IF ITS RELATIVELY LOW FLIGHT ALTITUDE AND LOOK DIRECTION THE EFFECTS OF MULTIPLE REFLECTIONS OFF THE ALPINE TERRAIN ARE REDUCED. HOWEVER GLISTIN A WAS DEVELOPED FOR APPLICATION ON ICE SHEETS WITH RELATIVELY FLAT ICE/SNOW SURFACES WELL BELOW FREEZING. HERE WE EVALUATE GLISTIN A DATA COLLECTED IN SEPTEMBER 2016 OVER GLACIATED ALPINE TERRAIN OF HIGH RELIEF AND RELATIVELY WARM (MELTING)ICE SURFACES. INITIAL RESULTS PROVE QUITE PROMISING. WE REQUEST FUNDS TO ANALYZE THE DATA FOR ESTIMATING SURFACE ELEVATION CHANGES ON GLACIERS TO ESTIMATE VOLUME CHANGE. WE DIFFERENCE THE GLISTIN A ELEVATIONS FROM ELEVATIONS DERIVED FROM HISTORIC TOPOGRAPHIC MAPS FROM TO CALCULATE VOLUME CHANGE AND THEREFORE WATER LOSS.THIS PROJECT WILL PROVIDE A NUMBER OF IMPORTANT PRODUCTS AND OUTCOMES. FIRST WE WILL PROVIDE A SNAPSHOT OF GLACIER TOPOGRAPHY A DATUM AGAINST WHICH FUTURE CHANGES IN TOPOGRAPHY CAN BE COMPARED. SECOND WE WILL PROVIDE AN ASSESSMENT OF GLACIER MASS LOSS ACROSS THE AMERICAN WEST CRITICAL TO UNDERSTANDING CHANGING ALPINE HYDROLOGY AND ECOSYSTEM AND TO UNDERSTANDING GLOBAL SEA LEVEL RISE.FURTHERMORE THE PRODUCTS WILL BE QUITE USEFUL TO MANAGEMENT OF FEDERAL LANDS AND FOR MODELING GLACIER CHANGE OVER BROAD REGIONS. FINALLY THIS NEW APPLICATION OF GLISTIN A GREATLY EXPANDS ITS UTILITY AND WILL REVOLUTIONIZE OUR CAPABILITY TO RAPIDLY ASSESS GLACIER CHANGE IN HIGH ALPINE REGIONS IN A TIMELY AND COST EFFECTIVE MANNER.