All scientific data collected by the Australian Antarctic program (AAp) are eventually described in the Catalogue of Australian Antarctic and Subantarctic Metadata (CAASM). CAASM can be used to search through AAp data descriptions, and it also provides links to access publicly available datasets, which can either be immediately downloaded or obtained from the Australian Antarctic Data Centre (AADC).

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Citation
Young, D., Roberts, J.L., Blankenship, D.D., Van Ommen, T., Ritz, C., Caviite, M.G. and Frezzotti, M. (2021) ICECAP radargrams in support of the international old ice search at Dome C - 2016, Ver. 1, Australian Antarctic Data Centre - doi:10.26179/5wkf-7361, Accessed: 2021-11-30
Title
ICECAP radargrams in support of the international old ice search at Dome C - 2016
Data Centre
Australian Antarctic Data Centre, Australia
DOI
doi:10.26179/5wkf-7361
Created Date
2021-07-05
Revision Date
2021-07-13
Parent record
None

Description

These radargrams were collected as part of the ICECAP (International Collaborative Exploration of the Cryosphere through Airborne Profiling) collaboration in 2015/16 (ICP7). These data were in part funded by the US National Science Foundation (SPICECAP; grant PLR-1443690 to UTIG), ACE-CRC and the G. Unger Vetlesen Foundation, and supported by the Australian Antarctic Division through project AAS-4346.

These data collection represents georeferenced, time registered instrument measurements (L1B data) converted to SI units, and is of most interest to users who wish to reprocess the data. Users interested in geophysical observables should used the derived Level 2 dataset. The data format are netCDF3 files, following the formats used for NASA/AAD/UTIG's ICECAP/OIB project at NASA's NSIDC DAAC. Metadata fields can be accessed using the open source ncdump tool, or c, python or matlab modules. See https://www.loc.gov/preservation/digital/formats/fdd/fdd000330.shtml for resources on NetCDF-3, and https://nsidc.org/data/IR2HI1B/versions/1 for a description of the similar OIB dataset.

RADAR
Ice penetrating radar provides the geometry of the englacial layers, the bedrock topography, and the basal conditions.
SR2HI1B georeferenced radar echo data; 4 Hz NetCDF

Data Acquisition Parameters
A 1-microsec transmitted chirp was used for both surface and bed. Two 14-bit digitizer channels with offset receiver gain were used to record returned echoes over 64 μsec, accommodating 120 dB of dynamic range, including accurate representations of power of the surface and bed echoes.

Bandwidth: 52.5-67.5 MHz
Tx power: 5700 W
Waveform: 1 microsec FM chirp generation, analog down-conversion to 10 MHz center
Sampling: 12-bit ADC at 50 MHz sampling
Record window: 64.74 μsec
Acquisition: two gain channels separated by 47 dB
Dynamic Range: 120 dB
Monostatic Rx/Tx
Data rate: 2.2 MB/sec
Maximum Doppler frequency: 36 Hz
Pulse Repetition Frequency: 6250 Hz
Onboard stacking: 32x

Processing Approach
Where possible focused data (Peters et al., 2007) was included, as this was preferred for englacial reflector tracing. Where not available, unfocused SAR was substituted. These are converted to magnitude and five of these stacks are incoherently summed resulting in the final 4 Hz sample rate.

Error Sources
For this Level 1B product, errors in power may be due to transmitter or receiver malfunctions. Elevated background noise may occur with areas of strong surface scattering (for example crevasses) or Radio Frequency (RF) noise from anthropogenic sources (for example radio calls from the aircraft or other radar systems).

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Purpose

These aerogeophysical data were collected during the seventh ICECAP field season (ICP7) in 2015-16, and interpreted and processed as part of the SPICECAP project. They consist of 7 survey flights using a BT-67 Basler and the ICECAP aergeophysical suite. The flights were based out of Australia's Casey Station and France/Italy's Concordia Station in East Antarctica, as part of a focused survey of the 'Little Dome C', a region with a suspected 1.5 Ma ice core record.

Quality

On ICP7 flights F05, the left hand radar antenna was not operational. On most flights, there was a flip in the sign of the left and right hand digitizers, that will be addressed in a future version of the data. There was a power mismatch between the left and right high gain receivers. Some transects have data tears which prevented focusing of the data.

Access

These data are publicly available for download from the provided URL.

Temporal Coverages

Spatial Coverages

Data Resolution

Latitude Resolution:
22 Metre(s)
Longitude Resolution:
22 Metre(s)
Vertical Resolution:
1.7 Metre(s)

Science Keywords

Additional Keywords

  • ANTARCHITECTURE
  • SPICECAP
  • ICECAP II
  • INTERNATIONAL COLLABORATIVE EXPLORATION OF THE CRYOSPHERE THROUGH AIRBORNE PROFILING
  • IPICS
  • OLD ICE - BEYOND EPICA
  • RADIOGLACIOLOGY
  • AEROGEOPHYSICS
  • ICE PENETRATING RADAR
  • MARFA
  • C-GJKB

Locations

  • GEOGRAPHIC REGION > POLAR
  • CONTINENT > ANTARCTICA > DOME C
  • CONTINENT > ANTARCTICA > LITTLE DOME C
  • CONTINENT > ANTARCTICA > EAST ANTARCTIC ICE SHEET
  • CONTINENT > ANTARCTICA > CONCORDIA

Platforms

  • Basler BT-67
  • AIRCRAFT

Instruments

  • Hi-Capability Radar Sounder Version2
  • Radio Detection and Ranging
  • Ground Penetrating Radar

Researchers

  • young, duncan (INVESTIGATOR,TECHNICAL CONTACT,DIF AUTHOR)
  • roberts, jason (INVESTIGATOR)
  • blankenship, donald (INVESTIGATOR)
  • van ommen, tas (INVESTIGATOR)
  • ritz, catherine (INVESTIGATOR)
  • caviite, marie (INVESTIGATOR)
  • frezzotti, massimo (INVESTIGATOR)

Use Constraints

This data set conforms to the CCBY Attribution License (http://creativecommons.org/licenses/by/4.0/).

Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4346_ICECAP_OIA_RADARGRAMS when using these data.

Creative Commons License