OBJECTIVE: TIDEWATER GLACIERS HAVE MORE THAN DOUBLED THEIR CONTRIBUTION TO GLOBAL SEA LEVEL RISE OVER THE LAST TWO DECADES WITH ICEBERGS ACCOUNTING FOR OVER 50% OF THIS CONTRIBUTION. HISTORICALLY ICEBERGS HAVE BEEN LINKED TO ABRUPT CLIMATE CHANGE EVENTS (E.G. HEINRICH EVENTS) AND CURRENT REGIONAL MODELS ARE PREDICTING THEIR CONTINUED ROLE IN OCEAN/CLIMATE IMPACTS. HOWEVER ICEBERGS AND THEIR FRESHWATER FLUX ARE NOT CURRENTLY INCLUDED IN GLOBAL CIRCULATION MODELS (GCMS) DUE IN PART TO A LACK OF PHYSICALLY BASED ICEBERG PARAMETERIZATIONS. THIS PROPOSAL USES REMOTELY SENSED DATA PRODUCTS DATA FROM PRIOR FIELD CAMPAIGNS AND AN ANALYTICAL MODEL OF ICEBERG MELT TO DEVELOP A PREDICTIVE MODEL OF ICEBERG FRESHWATER FLUX INTO THE GLOBAL OCEANS. THIS MODEL WILL ADDRESS THE NEEDS OF REMOTE SENSING AND ICEBERG MELT RATE STUDIES AS WELL AS LARGE-SCALE GLOBAL CLIMATE MODELS OVER A RANGE OF TIMESCALES AND RESOLUTIONS (FIG. 1). APPROACH: THIS STUDY WILL USE LANDSAT SATELLITE IMAGERY IN COMBINATION WITH &GT;550 FULL-ICEBERG GEOMETRIES AND A 2D ICEBERG MELT MODEL TO ESTABLISH PARAMETERIZATIONS OF ICEBERG SUBSURFACE GEOMETRY AND MELT RATE. FIRST I WILL USE EXISTING DATA SETS OF FULL-ICEBERG GEOMETRIES TO COMPARE AGAINST COINCIDENT SATELLITE IMAGERY TO DEVELOP AN EMPIRICAL RELATIONSHIP BETWEEN SUBSURFACE ICEBERG SHAPE AND ITS SURFACE EXPRESSION. THEN I WILL USE THE FULL-ICEBERG GEOMETRIES TO ESTABLISH REPRESENTATIVE ICEBERG GEOMETRIES BASED ON SIZE AND GEOGRAPHIC LOCATION. NEXT I WILL USE THESE REPRESENTATIVE GEOMETRIES TO UPDATE A CURRENT ICEBERG MELT MODEL AND CALCULATE 4- DIMENSIONAL FRESHWATER FLUX. I WILL VALIDATE THE MELT RATE PARAMETERIZATION USING DIRECT OBSERVATIONS OF ICEBERG MELT COLLECTED DURING 2017-2019 FIELD CAMPAIGNS. FINALLY I WILL COMBINE THE ABOVE PARAMETERIZATIONS TO ESTABLISH A PREDICTIVE MODEL OF ICEBERG FRESHWATER FLUX BASED UPON AN ICEBERG S SURFACE EXPRESSION AND LOCATION. UNIQUENESS: PREVIOUS REMOTE SENSING STUDIES OF ICEBERGS HAVE FOCUSED ON FRESHWATER FLUX IN SPECIFIC FJORDS USING ONLY A SUBSET OF AVAILABLE SATELLITE DATA PREFERENTIALLY SELECTING LARGE EASILY IDENTIFIABLE ICEBERGS. THIS PROPOSAL LEVERAGES IN SITU ICEBERG DATA (1973 2019) SPANNING A RANGE OF ICEBERG SIZES AND SHAPES TO DEVELOP A SINGLE ICEBERG PARAMETERIZATION THAT CAN BE APPLIED GLOBALLY WITHIN OCEAN MODELS AND GCMS TO REPRESENT AND PREDICT FRESHWATER FLUX. RELEVANCE TO NASA: THIS PROJECT SEEKS TO UNDERSTAND ICEBERG GEOMETRY AND DETERIORATION BOTH PHYSICALLY AT THE INDIVIDUAL ICEBERG LEVEL AND STATISTICALLY AT THE GLOBAL OCEAN SCALE. THE PROPOSED WORK DIRECTLY ADDRESSES THE INTERAGENCY ARCTIC RESEARCH POLICY COMMITTEE S GOALS BY DEVELOP[ING] DATA SETS TO IMPROVE GLOBAL REANALYSIS SYSTEMS IN THE ARCTIC AND ENHANCE UNDERSTANDING OF COMPLEX RELATIONSHIPS BETWEEN OCEAN SEA ICE LAND AND ATMOSPHERE[.] FURTHER THIS LARGE-SCALE EFFORT DIRECTLY ADDRESSES BOTH THE WATER CYCLE AND EARTH SURFACE OF THE NASA NIP. THIS PROJECT LEVERAGES INSIGHT ON FULL-ICEBERG GEOMETRIES THE PHYSICAL PROCESSES OF ICEBERG DETERIORATION AND SATELLITE-DERIVED ICEBERG DATA TO CONSTRAIN GLOBAL ICEBERG METRICS. IT EXPANDS THE COMMUNITY S KNOWLEDGE BY TAKING THE FIRST STEP TOWARD CREATING A SERIES OF ICEBERG GEOMETRIES AND A FRESHWATER FLUX MODULE FOR REGULAR USE IN GCMS AND GLOBAL OCEAN CIRCULATION MODELS TO PROMOTE BETTER DECISIONS ABOUT OUR ENVIRONMENT AND WATER.