EAGLE/ICECAP II RADARGRAMS
These radargrams were collected as part of the ICECAP (International Collaborative Exploration of the Cryosphere through Airborne Profiling) collaboration in 2015/16 (ICP7) and 2016/17 (ICP8). These data were in part funded by the US National Science Foundation (grant PLR-1543452 to UTIG), Antarctic...
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Australian Antarctic Data Centre
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Online Access: | https://researchdata.ands.org.au/eagleicecap-ii-radargrams/1356131 https://doi.org/10.26179/5bcff4afc287d https://data.aad.gov.au/metadata/records/AAS_4346_EAGLE_ICECAP_LEVEL2_RADAR_DATA http://nla.gov.au/nla.party-617536 |
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ftands:oai:ands.org.au::1356131 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Research Data Australia (Australian National Data Service - ANDS) |
op_collection_id |
ftands |
language |
unknown |
topic |
climatologyMeteorologyAtmosphere environment geoscientificInformation GLACIER THICKNESS/ICE SHEET THICKNESS EARTH SCIENCE CRYOSPHERE GLACIERS/ICE SHEETS RADARGRAM ICE PENETRATING RADAR RADIO ECHO SOUNDING HiCARS2 > Hi-Capability Radar Sounder Version2 BT-67 > Basler BT-67 CONTINENT > ANTARCTICA > Cook Ice Shelf Denman Glacier George V Coast Knox Coast Sabrina Coast Totten Glacier GEOGRAPHIC REGION > POLAR OCEAN > SOUTHERN OCEAN |
spellingShingle |
climatologyMeteorologyAtmosphere environment geoscientificInformation GLACIER THICKNESS/ICE SHEET THICKNESS EARTH SCIENCE CRYOSPHERE GLACIERS/ICE SHEETS RADARGRAM ICE PENETRATING RADAR RADIO ECHO SOUNDING HiCARS2 > Hi-Capability Radar Sounder Version2 BT-67 > Basler BT-67 CONTINENT > ANTARCTICA > Cook Ice Shelf Denman Glacier George V Coast Knox Coast Sabrina Coast Totten Glacier GEOGRAPHIC REGION > POLAR OCEAN > SOUTHERN OCEAN EAGLE/ICECAP II RADARGRAMS |
topic_facet |
climatologyMeteorologyAtmosphere environment geoscientificInformation GLACIER THICKNESS/ICE SHEET THICKNESS EARTH SCIENCE CRYOSPHERE GLACIERS/ICE SHEETS RADARGRAM ICE PENETRATING RADAR RADIO ECHO SOUNDING HiCARS2 > Hi-Capability Radar Sounder Version2 BT-67 > Basler BT-67 CONTINENT > ANTARCTICA > Cook Ice Shelf Denman Glacier George V Coast Knox Coast Sabrina Coast Totten Glacier GEOGRAPHIC REGION > POLAR OCEAN > SOUTHERN OCEAN |
description |
These radargrams were collected as part of the ICECAP (International Collaborative Exploration of the Cryosphere through Airborne Profiling) collaboration in 2015/16 (ICP7) and 2016/17 (ICP8). These data were in part funded by the US National Science Foundation (grant PLR-1543452 to UTIG), Antarctic Gateway, ACE-CRC 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 ice shelves and outlet glaciers, and provides constraints on properties at the base of the ice (e.g. subglacial waters, sub ice shelf melting) ER2HI1B georeferenced radar echo data; 4 Hz NetCDF Data Acquisition Parameters A 1-μsec 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 μsec 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 Unfocused Synthetic aperture radar (SAR) processing was done (internally referred to as pik1). This is a quick form of processing with no dependencies on other instruments. The first 10 recorded stacks are coherently summed resulting in a 20 Hz sample rate. Then, a narrow band notch filter is applied at 10 MHz to remove local oscillator (LO) leakage. The pulse is compressed using frequency domain convolution of over-scaled synthetic chirp waveform. This results in gains of 83 dB from overscaled chirp, 11.7 dB from range compression, and -3 dB from Hanning window. 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). |
author2 |
BLANKENSHIP, DONALD D (hasPrincipalInvestigator) ROBERTS, JASON LEIGH (hasPrincipalInvestigator) ROBERTS, JASON LEIGH (processor) GREENBAUM, JAMIN S. (hasPrincipalInvestigator) YOUNG, DUNCAN A. (hasPrincipalInvestigator) YOUNG, DUNCAN A. (processor) VAN OMMEN, TAS (hasPrincipalInvestigator) LE MEUR, EMMANUEL (hasPrincipalInvestigator) BEEM, LUCAS H (hasPrincipalInvestigator) Australian Antarctic Data Centre (publisher) |
format |
Dataset |
title |
EAGLE/ICECAP II RADARGRAMS |
title_short |
EAGLE/ICECAP II RADARGRAMS |
title_full |
EAGLE/ICECAP II RADARGRAMS |
title_fullStr |
EAGLE/ICECAP II RADARGRAMS |
title_full_unstemmed |
EAGLE/ICECAP II RADARGRAMS |
title_sort |
eagle/icecap ii radargrams |
publisher |
Australian Antarctic Data Centre |
url |
https://researchdata.ands.org.au/eagleicecap-ii-radargrams/1356131 https://doi.org/10.26179/5bcff4afc287d https://data.aad.gov.au/metadata/records/AAS_4346_EAGLE_ICECAP_LEVEL2_RADAR_DATA http://nla.gov.au/nla.party-617536 |
op_coverage |
Spatial: northlimit=-63; southlimit=-70.49557; westlimit=75.58594; eastLimit=156; projection=WGS84 Temporal: From 2015-12-30 to 2017-02-15 |
long_lat |
ENVELOPE(152.500,152.500,-68.667,-68.667) ENVELOPE(99.417,99.417,-66.750,-66.750) ENVELOPE(147.000,147.000,-69.000,-69.000) ENVELOPE(105.000,105.000,-66.500,-66.500) ENVELOPE(118.550,118.550,-67.000,-67.000) ENVELOPE(116.333,116.333,-66.833,-66.833) ENVELOPE(75.58594,156,-63,-70.49557) |
geographic |
Antarctic Cook Ice Shelf Denman Glacier George V Coast Knox Coast Sabrina Coast Southern Ocean Totten Glacier |
geographic_facet |
Antarctic Cook Ice Shelf Denman Glacier George V Coast Knox Coast Sabrina Coast Southern Ocean Totten Glacier |
genre |
Antarc* Antarctic Antarctica Australian Antarctic Division Cook Ice Shelf Denman Glacier Ice Sheet Ice Shelf Ice Shelves Southern Ocean Totten Glacier |
genre_facet |
Antarc* Antarctic Antarctica Australian Antarctic Division Cook Ice Shelf Denman Glacier Ice Sheet Ice Shelf Ice Shelves Southern Ocean Totten Glacier |
op_source |
Australian Antarctic Data Centre |
op_relation |
https://researchdata.ands.org.au/eagleicecap-ii-radargrams/1356131 8779b918-3a0a-42a4-9210-c7f926132dc2 doi:10.26179/5bcff4afc287d AAS_4346_EAGLE_ICECAP_LEVEL2_RADAR_DATA https://data.aad.gov.au/metadata/records/AAS_4346_EAGLE_ICECAP_LEVEL2_RADAR_DATA http://nla.gov.au/nla.party-617536 |
op_doi |
https://doi.org/10.26179/5bcff4afc287d |
_version_ |
1766247708799008768 |
spelling |
ftands:oai:ands.org.au::1356131 2023-05-15T13:47:42+02:00 EAGLE/ICECAP II RADARGRAMS BLANKENSHIP, DONALD D (hasPrincipalInvestigator) ROBERTS, JASON LEIGH (hasPrincipalInvestigator) ROBERTS, JASON LEIGH (processor) GREENBAUM, JAMIN S. (hasPrincipalInvestigator) YOUNG, DUNCAN A. (hasPrincipalInvestigator) YOUNG, DUNCAN A. (processor) VAN OMMEN, TAS (hasPrincipalInvestigator) LE MEUR, EMMANUEL (hasPrincipalInvestigator) BEEM, LUCAS H (hasPrincipalInvestigator) Australian Antarctic Data Centre (publisher) Spatial: northlimit=-63; southlimit=-70.49557; westlimit=75.58594; eastLimit=156; projection=WGS84 Temporal: From 2015-12-30 to 2017-02-15 https://researchdata.ands.org.au/eagleicecap-ii-radargrams/1356131 https://doi.org/10.26179/5bcff4afc287d https://data.aad.gov.au/metadata/records/AAS_4346_EAGLE_ICECAP_LEVEL2_RADAR_DATA http://nla.gov.au/nla.party-617536 unknown Australian Antarctic Data Centre https://researchdata.ands.org.au/eagleicecap-ii-radargrams/1356131 8779b918-3a0a-42a4-9210-c7f926132dc2 doi:10.26179/5bcff4afc287d AAS_4346_EAGLE_ICECAP_LEVEL2_RADAR_DATA https://data.aad.gov.au/metadata/records/AAS_4346_EAGLE_ICECAP_LEVEL2_RADAR_DATA http://nla.gov.au/nla.party-617536 Australian Antarctic Data Centre climatologyMeteorologyAtmosphere environment geoscientificInformation GLACIER THICKNESS/ICE SHEET THICKNESS EARTH SCIENCE CRYOSPHERE GLACIERS/ICE SHEETS RADARGRAM ICE PENETRATING RADAR RADIO ECHO SOUNDING HiCARS2 > Hi-Capability Radar Sounder Version2 BT-67 > Basler BT-67 CONTINENT > ANTARCTICA > Cook Ice Shelf Denman Glacier George V Coast Knox Coast Sabrina Coast Totten Glacier GEOGRAPHIC REGION > POLAR OCEAN > SOUTHERN OCEAN dataset ftands https://doi.org/10.26179/5bcff4afc287d 2020-01-05T22:17:57Z These radargrams were collected as part of the ICECAP (International Collaborative Exploration of the Cryosphere through Airborne Profiling) collaboration in 2015/16 (ICP7) and 2016/17 (ICP8). These data were in part funded by the US National Science Foundation (grant PLR-1543452 to UTIG), Antarctic Gateway, ACE-CRC 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 ice shelves and outlet glaciers, and provides constraints on properties at the base of the ice (e.g. subglacial waters, sub ice shelf melting) ER2HI1B georeferenced radar echo data; 4 Hz NetCDF Data Acquisition Parameters A 1-μsec 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 μsec 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 Unfocused Synthetic aperture radar (SAR) processing was done (internally referred to as pik1). This is a quick form of processing with no dependencies on other instruments. The first 10 recorded stacks are coherently summed resulting in a 20 Hz sample rate. Then, a narrow band notch filter is applied at 10 MHz to remove local oscillator (LO) leakage. The pulse is compressed using frequency domain convolution of over-scaled synthetic chirp waveform. This results in gains of 83 dB from overscaled chirp, 11.7 dB from range compression, and -3 dB from Hanning window. 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). Dataset Antarc* Antarctic Antarctica Australian Antarctic Division Cook Ice Shelf Denman Glacier Ice Sheet Ice Shelf Ice Shelves Southern Ocean Totten Glacier Research Data Australia (Australian National Data Service - ANDS) Antarctic Cook Ice Shelf ENVELOPE(152.500,152.500,-68.667,-68.667) Denman Glacier ENVELOPE(99.417,99.417,-66.750,-66.750) George V Coast ENVELOPE(147.000,147.000,-69.000,-69.000) Knox Coast ENVELOPE(105.000,105.000,-66.500,-66.500) Sabrina Coast ENVELOPE(118.550,118.550,-67.000,-67.000) Southern Ocean Totten Glacier ENVELOPE(116.333,116.333,-66.833,-66.833) ENVELOPE(75.58594,156,-63,-70.49557) |