Glacier shrinkage in the Alps continues unabated as revealed by a new glacier inventory from Sentinel-2
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Glacier shrinkage in the Alps continues unabated as revealed by a new glacier inventory from Sentinel-2

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Title and contributions: Glacier shrinkage in the Alps continues unabated as revealed by a new glacier inventory from Sentinel-2 / Frank Paul [et al.]

Publication: Gottinga: Copernicus Publications, 2020

Physical description: Testo elettronico (PDF) p.1805-1821 : ill.

Publication date:2020

Language: eng (language of the text, soundtrack, etc..)

Country: de

Note:
  • Autori: Frank Paul, Philipp Rastner, Roberto Sergio Azzoni, Guglielmina Diolaiuti, Davide Fugazza, Raymond Le Bris, Johanna Nemec, Antoine Rabatel, Mélanie Ramusovic, Gabriele Schwaizer, and Claudio Smiraglia
  • Abstract. The ongoing glacier shrinkage in the Alps requires frequent updates of glacier outlines to provide an accurate database for monitoring, modelling purposes (e.g. determination of run-off, mass balance, or future glacier extent), and other applications. With the launch of the first Sentinel-2 (S2) satellite in 2015, it became possible to create a consistent, Alpine-wide glacier inventory with an unprecedented spatial resolution of 10 m. The first S2 images from August 2015 already provided excellent mapping conditions for most glacierized regions in the Alps and were used as a base for the compilation of a new Alpine-wide glacier inventory in a collaborative team effort. In all countries, glacier outlines from the latest national inventories have been used as a guide to compile an update consistent with the respective previous interpretation. The automated mapping of clean glacier ice was straightforward using the band ratio method, but the numerous debris-covered glaciers required intense manual editing. Cloud cover over many glaciers in Italy required also including S2 scenes from 2016. The outline uncertainty was determined with digitizing of 14 glaciers several times by all participants. Topographic information for all glaciers was obtained from the ALOS AW3D30 digital elevation model (DEM). Overall, we derived a total glacier area of 1806_60 km2 when considering 4395 glaciers > 0:01 km2. This is 14% (􀀀1:2%a􀀀1) less than the 2100 km2 derived from Landsat in 2003 and indicates an unabated continuation of glacier shrinkage in the Alps since the mid-1980s. It is a lower-bound estimate, as due to the higher spatial resolution of S2 many small glaciers were additionally mapped or increased in size compared to 2003. Median elevations peak around 3000ma.s.l., with a high variability that depends on location and aspect. The uncertainty assessment revealed locally strong differences in interpretation of debris-covered glaciers, resulting in limitations for change assessment when using glacier extents digitized by different analysts. The inventory is available at https://doi.org/10.1594/PANGAEA.909133 (Paul et al., 2019)

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  • Type of Publication Date: Publication Dates 1 and 2: monograph complete when issued, or issued within one calendar year
  • Publication Date: 2020

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