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Artículo de publicación ISIWe present surface mass balance simulations ofthe Southern Patagonia Icefield (SPI) driven by downscaledreanalysis data. The simulations were evaluated and interpretedusing geodetic mass balances, measured point balancesand a complete velocity field of the icefield for spring2004. The high measured accumulation of snow of up to15.4 m w.e. yr−1(meters water equivalent per year) as wellas the high measured ablation of up to 11 m w.e. yr−1is reproducedby the model. The overall modeled surface massbalance was positive and increasing during 1975–2011. Subtractingthe surface mass balance from geodetic balances,calving fluxes were inferred. Mass losses of the SPI due tocalving were strongly increasing from 1975–2000 to 2000–2011 and higher than losses due to surface melt. Calvingfluxes were inferred for the individual glacier catchments andcompared to fluxes estimated from velocity data. Measurementsof ice thickness and flow velocities at the glaciers’front and spatially distributed accumulation measurementscan help to reduce the uncertainties of the different terms inthe mass balance of the Southern Patagonia Icefield.FONDECYT 	3140135 European Union 	22637

Quantifying mass balance processes on the Southern Patagonia Icefield