Consolidating morte loans
Furthermore, a widespread darkening of glacier surfaces during recent decades justifies the increasing importance and need of actual glacier albedo data.Glacier darkening was, for example, reported for the European Alps , the Himalayas , and on the Greenland ice sheet and surrounding glaciers [1,12], and related processes are studied in great detail .
Hence, current glacier mass balance models rely mostly on simplified homogeneous ice albedo parameters in their energy balance functions, neglecting the diversity of glacier surfaces and their changes over time .Since both formulae were established for Landsat 5 and 7, ensuring data continuity with new Landsat 8 or Sentinel-2 data, using these approaches of data requires critical judgement and likely some adjustments.Imaging spectroscopy provides a quasi-continuous spectral and high spatial sampling that is optimal to improve the knowledge of processes acting at the ice-atmosphere interface and to derive glacier surface albedo . is frequently used in glaciological studies (e.g., [20,21,22]).An alternative approach by Liang  was never validated for snow and ice surfaces.
Moreover, the impact of the anisotropy correction is analysed depending on different surface types.