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The Cryosphere An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/tcd-8-6235-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
Brief communication
20 Dec 2014
Review status
This discussion paper is a preprint. It has been under review for the journal The Cryosphere (TC). A final paper in TC is not foreseen.
Brief Communication: 2014 velocity and flux for five major Greenland outlet glaciers using ImGRAFT and Landsat-8
A. Messerli2,1, N. B. Karlsson1, and A. Grinsted1 1Centre for Ice and Climate, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen Ø, Denmark
2Section for Glaciers, Snow and Ice, Hydrology Department, Norwegian Water Resources and Energy Directorate, P.O. Box 5091 Majorstua, 0301 Oslo, Norway
Abstract. This study presents average velocity fields, mass flux estimates and central flowline profiles for five major Greenland outlet glaciers; Jakobshavn Isbræ, Nioghalvfjerdsbræ, Kangerdlugssuaq, Helheim and Petermann glaciers, spanning the period (August) 2013–(September) 2014. The results are produced by the feature tracking toolbox, ImGRAFT using Landsat-8, panchromatic data. The resulting velocity fields agree with the findings of existing studies. Furthermore, our results show an unprecedented speed of over 50 m day−1 at Jakobshavn Isbræ as it continues to retreat. All the processed data will be freely available for download at http://imgraft.glaciology.net.

Citation: Messerli, A., Karlsson, N. B., and Grinsted, A.: Brief Communication: 2014 velocity and flux for five major Greenland outlet glaciers using ImGRAFT and Landsat-8, The Cryosphere Discuss., https://doi.org/10.5194/tcd-8-6235-2014, 2014.
A. Messerli et al.

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We use 2014 Landsat-8 imagery in combination with a newly developed feature tracking toolbox, ImGRAFT to produce velocity fields and flux for five major Greenland marine terminating glaciers: Helheim, Kangerdlugssuaq, Nioghalvfjerdsbræ, Petermann and Jakobshavn Isbræ. A major finding of the paper documents the increased velocities observed at Jakobshavn Isbræ. We measure velocities over 50m/day which exceed that of the previously recorded maximum.
We use 2014 Landsat-8 imagery in combination with a newly developed feature tracking toolbox,...
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