Drews, Reinhard (2019): Ice thickness, surface-, and bed elevation of a pinning point in Roi Baudouin Ice Shelf, Dronning Maud Land Antarctica [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.905997, Supplement to: Berger, Sophie; Favier, Lionel; Drews, Reinhard; Derwael, Jean-Jacques; Pattyn, Frank (2016): The control of an uncharted pinning point on the flow of an Antarctic ice shelf. Journal of Glaciology, 62(231), 37-45, https://doi.org/10.1017/jog.2016.7
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Abstract:
This dataset describes ice thickness, surface elevation and bed elevation of a small pinning point located at the ice-shelf front of the Roi Baudouin Ice Shelf, Dronning Maud Land, Antarctica. The scientific context is as follows: Antarctic ice shelves are buttressed by numerous pinning points attaching to the otherwise freely-floating ice from below. Some of these kilometric-scale grounded features are unresolved in Antarctic-wide datasets of ice thickness and bathymetry, hampering ice flow models to fully capture dynamics at the grounding line and upstream. We investigate the role of an 8.7 km2 pinning point at the front of the Roi Baudouin Ice Shelf, East Antarctica. Using ERS interferometry and ALOS-PALSAR speckle tracking, we derive, on a 125 m grid spacing, surface velocities deviating by −5.2 ± 4.5 m a−1 from 37 on-site global navigation satellite systems-derived velocities. We find no evidence for ice flow changes on decadal time scales and we show that ice on the pinning point virtually stagnates, deviating the ice stream and causing enhanced horizontal shearing upstream. Using the BISICLES ice-flow model, we invert for basal friction and ice rigidity with three input scenarios of ice velocity and geometry. We show that inversion results are the most sensitive to the presence/absence of the pinning point in the bathymetry; surface velocities at the pinning point are of secondary importance. Undersampling of pinning points results in erroneous ice-shelf properties in models initialised by control methods. This may impact prognostic modelling for ice-sheet evolution in the case of unpinning.
Further details:
Drews, Reinhard; Matsuoka, Kenichi; Martín, Carlos; Callens, Denis; Bergeot, N; Pattyn, Frank (2015): Evolution of Derwael Ice Rise in Dronning Maud Land, Antarctica, over the last millennia. Journal of Geophysical Research-Earth Surface, 120(3), 564-579, https://doi.org/10.1002/2014JF003246
Coverage:
Latitude: -71.200000 * Longitude: 29.800000
Event(s):
Comment:
Radar thickness/bed measurements use wave speed of 1.68e8 m/s; Firn correction applied
Data reference and details on processing in: Drews, 2015 (doi:10.5194/tc-9-1169-2015).
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Polar stereographic projection, X | Polar stereo X | km | Drews, Reinhard | ||
| 2 | Polar stereographic projection, Y | Polar stereo Y | km | Drews, Reinhard | ||
| 3 | Surface elevation | Surf elev | m | Drews, Reinhard | Differential, kinematic GPS with dual phase receivers | |
| 4 | Bed elevation | Bed elev | m | Drews, Reinhard | ||
| 5 | Ice thickness | Ice thick | m | Drews, Reinhard |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Size:
1060 data points