Abstract:
From May 2009 to May 2013, seven dual-frequency GPS receivers were deployed along a 120 km-long transect in the south-west of the Greenland Ice Sheet. Two additional dual-frequency GPS receivers were deployed perpendicular to longitudinal ice flow at ~14 km inland: one 5 km distant from June 2011 to May 2013, and another 2.5 km distance from May 2012 to May 2013. Each receiver recorded position observations every 10 seconds or 30 seconds (depending on configuration), enabling resolution of horizontal and vertical ice motion. Sites were powered by solar panels and operated 24 hours a day during summer but shut down in the autumn. Absolute ice displacements at each site were obtained for each summer and winter period in the absence of continuous measurements. Position measurements were kinematically corrected relative to an off-ice base station using TRACK (Chen, 1999). Daily velocities were then obtained by differencing across 24-hour periods, whilst continuous velocities were obtained through application of a sliding 6-hour differencing window.
At each GPS site we also measured (1) the near-surface air temperature every 15 minutes year-round, (2) net seasonal ablation using ablation stakes, and (3) at several selected sites melt rates using sonic ranging sensors.
This version 2 of the dataset updates the previously 2-day temporal resolution of the ice motion records to 1-day resolution. In other respects the dataset has not changed.
Funded by NERC, the Carnegie Trust for the Universities of Scotland and The University of Edinburgh.
Relevant grants: NE/F021399/1, NE/H024964/1
Studentships: NE/I52830X/1, NE/J500021/1, NE/H526794/1
Keywords:
GPS, Greenland, ice flow, ice motion
Tedstone, A., & Neinow, P. (2018). Ice motion measurements, south-west Greenland Ice Sheet (version 2) (Version None) [Data set]. Polar Data Centre; British Antarctic Survey, Natural Environment Research Council; Cambridge, CB3 0ET, UK.. https://doi.org/10.5285/1f69fba3-4c62-47ad-8119-08cfeec05e46
| Access Constraints: | Requests for data can be made via the UK Polar Data Centre (UK PDC) at BAS. |
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| Use Constraints: | This data is governed by the NERC data policy http://www.nerc.ac.uk/research/sites/data/policy/ and supplied under Open Government Licence v.3 http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/ |
| Creation Date: | 2018-01-05 |
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| Dataset Progress: | Complete |
| Dataset Language: | English |
| ISO Topic Categories: |
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| Parameters: |
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| Personnel: | |
| Name | Dr Roger J A Duthie |
| Role(s) | Metadata Author |
| Organisation | British Antarctic Survey |
| Name | Prof Matt King |
| Role(s) | Investigator |
| Organisation | Newcastle University |
| Name | Dr Douglas Mair |
| Role(s) | Investigator |
| Organisation | University of Aberdeen |
| Name | Prof Peter Nienow |
| Role(s) | Investigator |
| Organisation | University of Edinburgh |
| Name | Dr Ian Bartholomew |
| Role(s) | Technical Contact, Investigator |
| Organisation | University of Edinburgh |
| Name | Dr Andrew Sole |
| Role(s) | Technical Contact, Investigator |
| Organisation | University of Aberdeen & University of Edinburgh |
| Name | Dr Andrew Tedstone |
| Role(s) | Investigator, Technical Contact |
| Organisation | University of Edinburgh |
| Parent Dataset: | N/A |
| Reference: | Tedstone, A. J. Hydrological controls on Greenland Ice Sheet motion. PhD thesis, University of Edinburgh, 2015. https://www.era.lib.ed.ac.uk/handle/1842/14169 Bartholomew, I. B. Hydrology and dynamics of a land-terminating Greenland outlet glacier. PhD thesis, University of Edinburgh, 2011. https://www.era.lib.ed.ac.uk/handle/1842/7613 Tedstone A., P. Nienow, N. Gourmelen and A. Sole (2014). Greenland ice sheet annual motion insensitive to spatial variations in subglacial hydraulic structure. Geophysical Research Letters, 41 (24), 8910-8917. DOI Tedstone A., P. Nienow, A. Sole, D. Mair, T. Cowton, I. Bartholomew and M.A. King (2013). Greenland ice sheet motion insensitive to exceptional meltwater forcing. Proceedings of the National Academy of Sciences, 110 (49), 19719-19724. DOI Sole A., P. Nienow, I. Bartholomew, D. Mair, T. Cowton, A. Tedstone and M.A. King (2013). Winter motion mediates dynamic response of the Greenland Ice Sheet to warmer summers. Geophysical Research Letters, 40 (15), 3940-3944. DOI Bartholomew I, Nienow P, Sole A, Mair D, Cowton T and King MA (2012). Short-term variability in Greenland Ice Sheet motion forced by time-varying meltwater drainage: Implications for the relationship between subglacial drainage system behavior and ice velocity. J. Geophys. Res., 117, F03002. DOI Bartholomew I, Nienow P, Sole A, Mair D, Cowton T, King M and Palmer S (2011). Seasonal variations in Greenland Ice Sheet motion: Inland extent and behaviour at higher elevations. Earth and Planetary Science Letters, 307, pp. 271-278. DOI |
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| Lineage: | See the PhD theses of Tedstone (2015) and Bartholomew (2011) for information on the methodology, quality and lineage of this dataset. | |
| Temporal Coverage: | |
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| Start Date | 2009-05-07 |
| End Date | 2013-05-12 |
| Spatial Coverage: | |
| Latitude | |
| Southernmost | 67.07 |
| Northernmost | 67.16 |
| Longitude | |
| Westernmost | -50.13 |
| Easternmost | -47.55 |
| Altitude | |
| Min Altitude | 445m |
| Max Altitude | 1712m |
| Depth | |
| Min Depth | N/A |
| Max Depth | N/A |
| Location: | |
| Location | Greenland |
| Detailed Location | Leverett Glacier/Russell Glacier, south-west Greenland |
| Source(s): |
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| Data Collection: | Sensors: GPS, GPS receivers, shielded temperature probes, sonic ranging devices |
| Data Storage: | The dataset is approx 15GB and is mostly in HDF5 format. |
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