Removing Tides and Inverse Barometer Effect on DInSAR of Antarctic Ice Shelves

Surface displacements are of particular interest for characterizing the dynamics of Antarctic ice shelves. Differential Synthetic Aperture Radar Interferometry (DInSAR) is a common technique from which high-resolution velocity maps can be inferred at high accuracy. However, though vertical displacement may be useful in some contexts, the main component of interest is the horizontal velocity when analyzing ice fluxes. Since SAR sensors are side-looking, it is the vector sum of both the vertical and horizontal components along the line of sight (LOS) that can be measured, creating some ambiguity in separating the two elements. Impacted by ocean tides and inverse barometer effect (IBE), ice shelves are subject to a vertical bias to be removed. Here, we present an empirical technique using Sentinel-1 radar satellite and regional models to estimate and remove the corresponding bias and show preliminary results on the Roi Baudouin Ice Shelf (RBIS) in Dronning Maud Land (Antarctica).