Abstract ID: 3.13923 | Accepted as Talk | Requested as: Talk | TBA | TBA

Ice and snow aerodynamic roughness (z0) are key and sensitive parameters of the surface energy balance of glaciers but one of the most difficult to measure. Recent advances in high-resolution (centimetric) uncrewed aerial vehicles (UAVs), or drone, have allowed to map z0 over glaciers, opening new avenues to inform glacier models. However, several challenges remain, including the sensitivity of z0 calculation to spatial resolution, trend removal method, and wind direction dependency. Here we introduced an open access tool, RugoBlock 1.0, that facilitates and harmonizes the calculation of z0 from high-resolution glacier digital elevation models (DEMs). The tool introduces a new scale-correction method, an optimal filtering step to separate roughness from topography, as well as wind dependency in the calculation of z0. Results show a positive contribution of the scale correction scheme, which allows using the tool with high-resolution satellite DEMs, thereby facilitating the mapping of z0 over entire glaciers.