Journal cover Journal topic
The Cryosphere An interactive open-access journal of the European Geosciences Union
The Cryosphere, 11, 911-921, 2017
http://www.the-cryosphere.net/11/911/2017/
doi:10.5194/tc-11-911-2017
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
12 Apr 2017
Initiation of a major calving event on the Bowdoin Glacier captured by UAV photogrammetry
Guillaume Jouvet1, Yvo Weidmann1, Julien Seguinot1, Martin Funk1, Takahiro Abe2, Daiki Sakakibara3, Hakime Seddik3, and Shin Sugiyama3 1ETHZ, VAW, Zurich, Switzerland
2Graduate School of Science, Hokkaido University, Sapporo, Japan
3Institute of Low Temperature Science, Hokkaido University, Sapporo, Japan
Abstract. In this paper, we analyse the calving activity of the Bowdoin Glacier, north-western Greenland, in 2015 by combining satellite images, UAV (unmanned aerial vehicle) photogrammetry and ice flow modelling. In particular, a high-resolution displacement field is inferred from UAV orthoimages taken immediately before and after the initiation of a large fracture, which induced a major calving event. A detailed analysis of the strain rate field allows us to accurately map the path taken by the opening crack. Modelling results reveal (i) that the crack was more than half-thickness deep, filled with water and getting irreversibly deeper when it was captured by the UAV and (ii) that the crack initiated in an area of high horizontal shear caused by a local basal bump immediately behind the current calving front. The asymmetry of the bed at the front explains the systematic calving pattern observed in May and July–August 2015. As a corollary, we infer that the calving front of the Bowdoin Glacier is currently stabilized by this bedrock bump and might enter into an unstable mode and retreat rapidly if the glacier keeps thinning in the coming years. Beyond this outcome, our study demonstrates that the combination of UAV photogrammetry and ice flow modelling is a promising tool to horizontally and vertically track the propagation of fractures responsible for large calving events.

Citation: Jouvet, G., Weidmann, Y., Seguinot, J., Funk, M., Abe, T., Sakakibara, D., Seddik, H., and Sugiyama, S.: Initiation of a major calving event on the Bowdoin Glacier captured by UAV photogrammetry, The Cryosphere, 11, 911-921, doi:10.5194/tc-11-911-2017, 2017.
Publications Copernicus
Download
Short summary
In this study, we combine UAV (unmanned aerial vehicles) images taken over the Bowdoin Glacier, north-western Greenland, and a model describing the viscous motion of ice to track the propagation of crevasses responsible for the collapse of large icebergs at the glacier-ocean front (calving). This new technique allows us to explain the systematic calving pattern observed in spring and summer of 2015 and anticipate a possible rapid retreat in the future.
In this study, we combine UAV (unmanned aerial vehicles) images taken over the Bowdoin Glacier,...
Share