Synergy of TanDEM-X DEM differencing and input-output method for glacier monitoring

The TanDEM-X/TerraSAR-X satellite formation, applying bistatic radar interferometry, delivers precise, spatially detailed topographic data, an excellent basis for mapping glacier volume change. Repeat pass data of these satellites are used for mapping glacier motion, key information for investigating the dynamic response of glaciers to changing boundary conditions. The synergistic analysis of these data sets provides main glacier parameters: the total net mass balance at annual and multi-annual intervals, the surface mass balance providing the link to atmospheric forcing, and ice export due to calving which is sensitive to changes in ice dynamics and ocean properties. The methods and capabilities of the TanDEM-X mission for delivering these parameters are described. The application is demonstrated for outlet glaciers of the Antarctic Peninsula that have been subject to major dynamic instability in recent years after collapse of buttressing ice shelves.