Abstract:
This is a collection of GPS data from dual-frequency GPS units deployed on the Filchner-Ronne Ice Shelf and adjoining ice streams. Filenames contain ice stream code and, in some cases, where the ice stream code is followed by a plus or minus sign, the approximate distance in kilometres upstream from the ice stream's grounding line, although in other cases the number is arbitrary. The naming convention has been preserved for legacy reasons. The ice streams are Evans (E & XX), Rutford (R), Institute (IIS), Talutis (T & TT) and Foundation (H) ice streams.
Each GPS unit's data are given in a netCDF4_classic file containing 4 columns: "Date number", as the number of days from January 0, 0000 in the proleptic ISO calendar; "Latitude" & "Longitude", both in decimal degrees in the WGS 1984 EPSG:4326 co-ordinate system; "height", in metres above the reference ellipsoid. The data have been collated from daily files, processed using the Bernese 5.0 software, using precise point positioning at intervals of 30 seconds. Note that data have not been corrected for inverse barometer or ocean tide loading effects.
These data were collected as part of a systemic campaign to look for modulation in ice flow through ocean tidal forcing. The vertical tidal motion of floating ice shelves generates stresses which cause a change in horizontal ice velocity at periods of hours to years. These signals can travel far upstream of ice stream grounding lines and often exhibit a change in frequency from the astronomical tides that generate them. As such, they can act as a natural experiment with which we can learn about ice rheology and subglacial processes.
Keywords:
Filcher-Ronne, GPS, Ice Shelf, Ice Stream
Gudmundsson, H., Fenney, N., & Rosier, S. (2017). Timeseries from GPS units deployed on ice streams and the adjoining ice shelf across the Filchner-Ronne region, Antarctica, 2005-2016 (Version None) [Data set]. Polar Data Centre; British Antarctic Survey, Natural Environment Research Council; Cambridge, CB3 0ET, UK.. https://doi.org/10.5285/4fe11286-0e53-4a03-854c-a79a44d1e356
| Access Constraints: | This dataset is made available under the Open Government Licence 3.0 (http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/) |
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| Use Constraints: | This dataset is made available under the Open Government Licence 3.0 (http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/) |
| Creation Date: | 2017-07-05 |
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| Dataset Progress: | In Work |
| Dataset Language: | English |
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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 | Dr Sebastian Rosier |
| Role(s) | Technical Contact, Investigator |
| Organisation | British Antarctic Survey |
| Name | Mr Nathan Fenney |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Name | Dr G. Hilmar Gudmundsson |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Parent Dataset: | N/A |
| Reference: | Dach R., Beutler G., Gudmundsson G. (2009) Analysis of GPS Data from An Antarctic Ice Stream. In: Sideris M.G. (eds) Observing our Changing Earth. International Association of Geodesy Symposia, vol 133. Springer, Berlin, Heidelberg. doi:10.1007/978-3-540-85426-5_67 Hugentobler, U., Dach, R., Fridez, P.& Meindl, M. Bernese GPS Software version 5.0. http://www.bernese.unibe.ch (The Astronomical Institute of the University of Bern, 2005) |
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| Quality: | This data is presented as the best currently available. | |
| Lineage/Methodology: | This data was collected and collated as a part of the Filchner Ice Shelf System (FISS) project. | |
| Ownership: | Natural Environment Research Council | |