Rückamp, Martin; Blindow, Norbert; Suckro, Sonja K; Braun, Matthias Holger; Humbert, Angelika (2012): Measured ice surface velocities on the King George Island ice cap with DGPS [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.773310, Supplement to: Rückamp, M et al. (2010): Dynamics of the ice cap on King George Island, Antarctica: field measurements and numerical simulations. Annals of Glaciology, 51(55), 80-90, https://doi.org/10.3189/172756410791392817
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Abstract:
King George Island is located at the northern tip of the Antarctic Peninsula, which is influenced by maritime climate conditions. The observed mean annual air temperature at sea level is -2.4°C. Thus, the ice cap is regarded as sensitive to changing climatic conditions. Ground-penetrating radar surveys indicate a partly temperate ice cap with an extended water layer at the firn/ice transition of the up to 700 m high ice cap. Measured firn temperatures are close to 0°C at the higher elevations, and they differ considerably from the measured mean annual air temperature. The aim of this paper is to present ice-flow dynamics by means of observations and simulations of the flow velocities. During several field campaigns from 1997/98 to 2008/09, ice surface velocities were derived with repeated differential GPS measurements. Ice velocities vary from 0.7 m/a at the dome to 112.1 m/a along steep slopes. For the western part of the ice cap a three-dimensional diagnostic full-Stokes model was applied to calculate ice flow. Parameters of the numerical model were identified with respect to measured ice surface velocities. The simulations indicate cold ice at higher elevations, while temperate ice at lower elevations is consistent with the observations.
Related to:
Rückamp, Martin; Braun, Matthias Holger; Suckro, Sonja K; Blindow, Norbert (2011): Observed glacial changes on the King George Island ice cap, Antarctica, in the last decade. Global and Planetary Change, 79(1-2), 99-109, https://doi.org/10.1016/j.gloplacha.2011.06.009
Project(s):
Funding:
German Research Foundation (DFG), grant/award no. 5472008: Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas
Coverage:
Median Latitude: -62.081927 * Median Longitude: -58.567781 * South-bound Latitude: -62.180390 * West-bound Longitude: -58.917420 * North-bound Latitude: -61.965350 * East-bound Longitude: -58.222540
Minimum ELEVATION: 90 m a.s.l. * Maximum ELEVATION: 700 m a.s.l.
Event(s):
Comment:
During several field campaigns from 1997/98 to 2008/09, in-situ ice surface velocities were derived with repeated differential GPS measurements.The calculated velocities range from about 0 m/a close to the domes and ice divides to 112.1m/a at the inner parts of the main ice cap. They neither show seasonal variations nor an incresase/decrease within the observational period. Therefore, in case of multiple readings, the mean value is calaculated. Note that also the location in the provided data set is a mean value.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | LATITUDE | Latitude | Geocode | |||
| 2 | LONGITUDE | Longitude | Geocode | |||
| 3 | UTM Northing, Universal Transverse Mercator | UTM north | m | Rückamp, Martin | ||
| 4 | UTM Easting, Universal Transverse Mercator | UTM east | m | Rückamp, Martin | ||
| 5 | UTM Zone, Universal Transverse Mercator | UTM Zone | Rückamp, Martin | |||
| 6 | ELEVATION | Elevation | m a.s.l. | Geocode | ||
| 7 | Velocity magnitude | Vel mag | m/a | Rückamp, Martin | ||
| 8 | Ice-flow direction | Ice-flow dir | deg | Rückamp, Martin |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
610 data points