Radar-derived bed reflectivity of Rutford Ice Stream, West Antarctica, December 2016 to January 2017

The dataset presented here contains a csv-file including the coordinates, received power of the bed reflection and the two-way travel time of the bed reflection. The X and Y coordinates are projected in EPSG:3031 - WGS 84 / Antarctic Polar Stereographic coordinate system.



Data presented here have been frequency filtered and 2D migrated (using a finite difference approach and migration velocity of 0.168 m ns-1), followed by the picking of the bed reflection using ReflexW software (Sandmeier Scientific Software). The received power is calculated within a 280 ns time window centred on, and encompassing, the bed reflection (Gades et al., 2000).





This work was funded within the BEAMISH project by NERC AFI award numbers NE/G014159/1 and NE/G013187/1.

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Date (Creation)
2020-11-30
Date (Revision)
2020-11-30
Date (Publication)
2020-11-30
Date (released)
2020-11-30
Edition

1.0
Unique resource identifier
https://doi.org/10.5285/5f68fce1-863e-4173-acdb-0ed03cca1c95
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doi
Unique resource identifier
GB/NERC/BAS/PDC/01438
Codespace

https://data.bas.ac.uk/

Unique resource identifier
NE/G014159/1
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award
Unique resource identifier
NE/G013187/1
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Other citation details

Please cite this item as: Schlegel, R., Brisbourne, A., King, E., Murray, T., & Smith, A. (2020). Radar-derived bed reflectivity of Rutford Ice Stream, West Antarctica, December 2016 to January 2017 (Version 1.0) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/5f68fce1-863e-4173-acdb-0ed03cca1c95

Credit

No credit.
Status
Completed
Point of contact
Organisation name Individual name Electronic mail address Role

Swansea University

 		Schlegel, Rebecca Author
British Antarctic Survey Brisbourne, Alex Author
British Antarctic Survey King, Edward Author

Swansea University

 		Murray, Tavi Author
British Antarctic Survey Smith, Andrew Author
NERC EDS UK Polar Data Centre

PDCServiceDesk@bas.ac.uk

Point of contact
Maintenance and update frequency
As needed
Maintenance note
Completed
Global Change Master Directory (GCMD) Science Keywords
Theme

  • BEAMISH

  • West Antarctica

  • fast flowing ice stream

  • radar reflectivity
Place

  • Rutford Ice Stream Antarctica

GEMET - INSPIRE themes, version 1.0
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no limitations to public access
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no limitations
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Open Government Licence v3.0
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This data is supplied under Open Government Licence v3.0
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No restrictions apply.
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url
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url
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url
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url
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Cross reference
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doi
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doi
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doi
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doi
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doi
Codespace

doi
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Cross reference
Unique resource identifier
doi
Codespace

doi
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Cross reference
Unique resource identifier
doi
Codespace

doi
Association Type
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Spatial representation type
Text, table
Language
English
Character set
UTF8
Topic category
  • Geoscientific information
N
S
E
W
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Begin date
2016-12-01
End date
2017-01-31
Supplemental Information

It is recommended that careful attention be paid to the contents of any data, and that the author be contacted with any questions regarding appropriate use. If you find any errors or omissions, please report them to polardatacentre@bas.ac.uk.

Title

European Petroleum Survey Group (EPSG) Geodetic Parameter Registry
Date (Publication)
2008-11-12
Cited responsible party
Organisation name Individual name Electronic mail address Role

European Petroleum Survey Group

EPSGadministrator@iogp.org

Publisher
Unique resource identifier
urn:ogc:def:crs:EPSG::3031
Version

6.18.3

Distributor

Distributor contact
Organisation name Individual name Electronic mail address Role
NERC EDS UK Polar Data Centre

PDCServiceDesk@bas.ac.uk

Distributor
Distributor format
Name Version
text/plain
text/csv
Units of distribution

bytes
Transfer size
14784922
OnLine resource
Protocol Linkage Name

WWW:LINK-1.0-http--link

 		https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=5f68fce1-863e-4173-acdb-0ed03cca1c95

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bytes
Transfer size
14784922
OnLine resource
Protocol Linkage Name

WWW:LINK-1.0-http--link

 		https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=5f68fce1-863e-4173-acdb-0ed03cca1c95

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Dataset
Statement

Methodology:

Data presented here have been frequency filtered and 2D migrated (using a finite difference approach and migration velocity of 0.168 m ns-1), followed by the picking of the bed reflection using ReflexW software (Sandmeier Scientific Software). Reflectivity values were calculated following the method by Gades et al., (2000). The received power, presented in this dataset, is calculated within a 280 ns time window centred on, and encompassing, the bed reflection (Gades et al., 2000).





This received power has not been corrected for englacial attenuation. A calibration of the amplitude of this dataset using a control reflection point (e.g. where the dielectric contrast is known, such as at the ice-water interface at the base of an ice shelf) has not been possible here. The reflectivity within this data therefore only represents relative reflectivity.





Detailed information on how the reflectivity can be calibrated and analysed will be contained in Schlegel et al. (in prep.).

Data collection:

Instrumentation:





Surface radar data were acquired in 2016/17 (as part of the BEAMISH project), using the British Antarctic Survey (BAS) DELORES radar system (King et al., 2007). This system has a half-dipole length of 20 m, and radiates energy with a centre-frequency of ~3 MHz. Navigation along each line was provided by single-frequency GPS units mounted on the towing snowmobile. A sledge at the midpoint between receiver and transmitter was equipped with dual-frequency GPS receivers to provide more accurate positions for post-processing.





Software:





ReflexW (Sandmeier Scientific Software) as well as MATLAB for the calculation of the received power.

Data quality:

The centre frequency of the DELORES dataset presented here is 3 MHz, the wavelength in ice (wave speed in ice=0.168 m ns-1) is 56 m. Lines were acquired perpendicular to the ice flow, with a 500 m spacing between them. The along track sampling is around 2 m. Data has been 2D migrated (along acquisition direction), the theoretical horizontal resolution of the dataset after 2D migration is 12 m.





The bed reflection was clearly identifiable along the whole dataset. The received power is calculated within a 280 ns time window centred on, and encompassing, the bed reflection (Gades et al., 2000).

Metadata

File identifier
5f68fce1-863e-4173-acdb-0ed03cca1c95 XML
Metadata language
English
Character set
UTF8
Hierarchy level
Dataset
Hierarchy level name

dataset
Date stamp
2020-11-30
Metadata standard name

ISO 19115 Geographic Information - Metadata
Metadata standard version

ISO 19115:2003(E)
Metadata author
Organisation name Individual name Electronic mail address Role
NERC EDS UK Polar Data Centre

polardatacentre@bas.ac.uk

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Keywords

BEAMISH West Antarctica fast flowing ice stream radar reflectivity
GEMET - INSPIRE themes, version 1.0

Elevation
Global Change Master Directory (GCMD) Science Keywords

EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets > Glacier Topography/Ice Sheet Topography EARTH SCIENCE > Spectral/Engineering > Radar > Radar Reflectivity


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