EGU21-10673, updated on 04 Mar 2021
https://doi.org/10.5194/egusphere-egu21-10673
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Observations of Arctic melt ponds and supragacial lakes from airborne camera data

Niklas Neckel1, Niels Fuchs1, Angelika Humbert1,2, Veit Helm1, Gerit Birnbaum1, Lars Kaleschke1, and Christian Haas1,2
Niklas Neckel et al.
  • 1Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany
  • 2University of Bremen, Germany

In summer, melt ponds on arctic sea ice can cover up to 60% of the total sea ice area, significantly decreasing surface albedo. The latter also holds true for supraglacial lakes frequently forming in the ablation zone of the Greenland Ice Sheet. Therefore monitoring of both, melt ponds on sea ice and supraglacial lakes is of great importance. So far, detection algorithms for both phenomena have been developed seperately from each other. Here, we will use airborne optical data of supraglacial lakes acquired during a land ice campaign over north-east Greenland in 2013 and airborne images of melt ponds from the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) campaign to illustrate similarities and differences in the appearance of both phenomena. As an example study, we use an open source processing chain including the Open Drone Map software as well as the AMES stereo pipeline to generate orthorectified photo mosaics. On the basis of these datasets, we will discuss typical detection methods as well as the difficulties they face in the respective environment (f.e. confusion with shadows and bare ice). Besides a modified normalized difference water index we test an adapted random forest approach that was developed for the analysis of MOSAiC melt pond data and conclude with suggestions for future algorithm development.

How to cite: Neckel, N., Fuchs, N., Humbert, A., Helm, V., Birnbaum, G., Kaleschke, L., and Haas, C.: Observations of Arctic melt ponds and supragacial lakes from airborne camera data, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-10673, https://doi.org/10.5194/egusphere-egu21-10673, 2021.

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