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Polar Ice Sheets and Ice Shelves: Mass Balance, Uncertainties, and Potential Improvements Robert H Thomas…etc. Estimating ice-sheet mass balance: techniques. Mass-budget , compares total snow accumulation with losses by ice discharge and melt runoff

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## Estimating ice-sheet mass balance: techniques

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**Polar Ice Sheets and Ice Shelves:Mass Balance,**Uncertainties, and Potential ImprovementsRobert H Thomas…etc**Estimating ice-sheet mass balance:techniques**Mass-budget, compares total snow accumulation with losses by ice discharge and melt runoff Repeated altimetry, to estimate volume changes Temporal changes in gravity, to infer mass changes**Greenland Ice Sheet: rates of surface-elevation change**(dS/dt)Above (red), and below (blue) ~ 2000-m elevation**Antarctic Surface Elevation Change**LIS FRIS AP PIG RIS**Crane Glacier after Larsen breakup**airborne lidar profiles measured in 2002 & 2004**Causeso post-glacial memoryo variability/trends in**snowfall/meltingo changes in glacier velocities - ice shelves - basal lubrication - ????

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