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Processed airborne radio-echo sounding data from the IMAFI survey covering the Institute and Moller ice streams and the Patriot Hills, West Antarctica (2010/2011)

An airborne radar survey was flown over the Institute and Moller ice streams in the Weddell Sea sector of West Antarctica in the austral summer of 2010/11 as part of the Institute-Moller Antarctic Funding Initiative (IMAFI) project (grant reference number: NE/G013071/1). This project was a NERC Antarctic Funding Initiative (AFI) collaborative project between the British Antarctic Survey and the Universities of Edinburgh, York, Aberdeen and Exeter with the aim to test the hypothesis that the Institute and Moller ice streams are underlain by weak marine sediments which control the flow of the overlying ice.

Operating from two static field camps close to the ice divide between the Institute and Moller ice streams and Patriot Hills, we collected ~25,000 km of airborne radio-echo sounding data across 28 survey lines. Our aircraft was equipped with dual-frequency carrier-phase GPS for navigation, radar altimeter for surface mapping, wing-tip magnetometers, a LaCoste and Romberg air-sea gravimeter, and an ice-sounding radar system (PASIN).

We present here the full radar dataset consisting of the deep-sounding chirp and shallow-sounding pulse-acquired data in their processed form, as well as the navigational information of each trace, the surface and bed elevation picks, ice thickness, and calculated absolute surface and bed elevations. This dataset comes primarily in the form of NetCDF and georeferenced SEGY files. To interactively engage with this newly-published dataset, we also created segmented quicklook PDF files of the radar data.

Simple

Alternate title
Polar Data Centre (PDC) record GB/NERC/BAS/PDC/01527
Date (Publication)
2021-09-24
Identifier
http://www.antarctica.ac.uk/dms/metadata.php?id= / GB/NERC/BAS/PDC/01527
Custodian
  British Antarctic Survey
High Cross, Madingley Road , Cambridge , CB3 0ET , UK
+44 (0)1223 221400
Originator
  Polar Data Centre,Natural Environment Research Council,UK Research & Innovation - Ross, Neil;Bingham, Robert;Ferraccioli, Fausto;Jordan, Tom;Le Brocq, Anne;Rippin, David;Siegert, Martin
High Cross, Madingley , Cambridge , CB3 0ET , UK
+44 (0)1223 221400
Maintenance and update frequency
unknown Unknown
Keywords
  • NDGO0001
NERC OAI Harvesting
  • NERC_DDC
GCMD Parameter Valids
  • EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets
  • EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets > Glacier Elevation/Ice Sheet Elevation
  • EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets > Glacier Thickness/Ice Sheet Thickness
  • EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets > Glacier Topography/Ice Sheet Topography
  • EARTH SCIENCE > Spectral/Engineering > Radar
BAS Free-text keywords
  • Antarctic
  • aerogeophysics
  • ice thickness
  • radar
  • surface elevation
Use limitation

This data is covered by a UK Open Government Licence (http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/). Further by downloading this data the user acknowledges that they agree with the NERC data policy (http://www.nerc.ac.uk/research/sites/data/policy.asp), and the following conditions:

1. To cite the data in any publication as follows:

Ross, N., Bingham, R., Ferraccioli, F., Jordan, T., Le Brocq, A., Rippin, D., & Siegert, M. (2021). Processed airborne radio-echo sounding data from the IMAFI survey covering the Institute and Moller ice streams and the Patriot Hills, West Antarctica (2010/2011) (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/F32B298B-7906-4360-9E34-16739AF73BB7

2. The user recognizes the limitations of data. Use of the data is at the users'' own risk, and there is no warranty as to the quality or accuracy of any data, or the fitness of the data for your intended use. The data are not necessarily fully quality assured and cannot be expected to be free from measurement uncertainty, systematic biases, or errors of interpretation or analysis, and may include inaccuracies in error margins quoted with the data.

Access constraints
otherRestrictions Other restrictions
Other constraints

This data is covered by a UK Open Government Licence (http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/). Further by downloading this data the user acknowledges that they agree with the NERC data policy (http://www.nerc.ac.uk/research/sites/data/policy.asp), and the following conditions:

1. To cite the data in any publication as follows:

Ross, N., Bingham, R., Ferraccioli, F., Jordan, T., Le Brocq, A., Rippin, D., & Siegert, M. (2021). Processed airborne radio-echo sounding data from the IMAFI survey covering the Institute and Moller ice streams and the Patriot Hills, West Antarctica (2010/2011) (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/F32B298B-7906-4360-9E34-16739AF73BB7

2. The user recognizes the limitations of data. Use of the data is at the users'' own risk, and there is no warranty as to the quality or accuracy of any data, or the fitness of the data for your intended use. The data are not necessarily fully quality assured and cannot be expected to be free from measurement uncertainty, systematic biases, or errors of interpretation or analysis, and may include inaccuracies in error margins quoted with the data.

Metadata language
EnglishEnglish
Topic category
  • Elevation
  • Geoscientific information
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Begin date
2010-12-20
End date
2011-01-09
Reference system identifier
OGP / urn:ogc:def:crs:EPSG::4326
Distribution format
Distributor
  Polar Data Centre - British Antarctic Survey
+44 (0)1223 221400
OnLine resource
https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=f32b298b-7906-4360-9e34-16739af73bb7
Hierarchy level
dataset Dataset

Domain consistency

Measure identification
INSPIRE / Conformity_001

Conformance result

Date
Explanation
See the referenced specification
Pass
No
Statement

- Line spacing: 7.5 km

- Trace spacing (post-processed data): ~10 m

- Vertical resolution: ~8.4 m

- Radar centre frequency: 150 MHz

- Radar bandwidth: 12 MHz

- Radar Receiver vertical sampling frequency: 22 MHz

- Absolute GPS positional accuracy: ~0.1 m (relative accuracy is one order of magnitude better). Banking angle was limited to 10 degrees during aircraft turns to avoid phase issues between GPS receiver and transmitter.

Please note:

- The surface and bed pick information (surface and bed elevation, ice thickness, etc.) can be found at: https://doi.org/10.5285/7946c497-72fc-41cb-a9b2-bf9980efe156.

- The SEGY files for the SAR-processed chirp data can be found at: https://doi.org/10.5285/8a975b9e-f18c-4c51-9bdb-b00b82da52b8.

However, note that the following issues were found with the DOI above:

a) The ''IceSurfacePositioning'' files suffered from duplicated and/or missing values throughout which required fixing by re-connecting the trace time between the surface files and the native GPS files.

b) The X/Y values found in the ''SEGY'' files were not geospatially accurate.

c) Only SAR-chirp SEGY (DLRsar) files are provided, however the pulse-data and another version of the processed chirp (cHG) had not yet been released.

The datasets found here have been considerably curated and improved, and thus can be considered the latest and full dataset.

File identifier
GB_NERC_BAS_PDC_01527 XML
Metadata language
EnglishEnglish
Hierarchy level
dataset Dataset
Date stamp
2021-09-24
Metadata standard name
NERC profile of ISO19115:2003
Metadata standard version
1.0
Point of contact
  British Antarctic Survey
+44 (0)1223 221400
Dataset URI
http://www.antarctica.ac.uk/dms/metadata.php?id=GB/NERC/BAS/PDC/01527
 
 

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