Data

Ice Shelf Surface Elevation data: Amery Ice Shelf 1988-89

Australian Antarctic Division
Allison, I. ; ALLISON, IAN
Viewed: [[ro.stat.viewed]] Cited: [[ro.stat.cited]] Accessed: [[ro.stat.accessed]]
ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=http://data.aad.gov.au/metadata/Amery_Ht_88-89&rft.title=Ice Shelf Surface Elevation data: Amery Ice Shelf 1988-89&rft.identifier=http://data.aad.gov.au/metadata/Amery_Ht_88-89&rft.publisher=Australian Antarctic Data Centre&rft.description=A Lambert Glacier - Amery Ice Shelf series of airborne (Squirrel helicopter and Twin Otter fixed wing) RES and surface elevation profiles were conducted over two summer seasons; 1988/89 and 1989/90. Altogether nearly 10,000 km of various flight paths were undertaken, operating out of Mawson (67.60 S, 62.88 E), Davis (68.58 S, 77.97 E), Dovers (70.22 S, 65.87 E) or Beaver Lake (70.80 S, 68.18 E).More information can be found at the BEDMAP website.The fields in this dataset are:mission_id (unique mission identifier) latitude (decimal degrees) longitude (decimal degrees) ice_thickness (m) surface_elevation (m) water_column_thickness (m) bed_elevation (m) Progress Code: completedStatement: Gaps in the data exceeded 50% for 1988/89 (lack of digital barometer), but formed a largely complete set for 1989/90. The ANARE Mk V 100 MHz ice radar produced peak power of 4 kW with a pulse duration of 250 ns and repetition rate of 10 kHz. A logarithmic amplifier stage was incorporated into the system. Fixed wing (Twin Otter) antenna array consisted of a transmit and receive yagi (1 driven element, 1 director, aircraft wing as reflector); helicopter (AS350B Squirrel) antenna array consisted of a single-element in a pseudo-corner corner reflector arrangement beneath the aircraft body. Typical flight speeds were 240 km/hr (Twin Otter) and 180 km/hr (Squirrel). Typical flight altitudes were 300 m above the terrain surface for both aircraft. Data was recorded continuously on 35mm BandW film, later scaled by hand every 20 s of flight time (approximately 1 km). Delay times were reduced to aircraft-surface separations assuming a signal propagation speed of 300 m/microsecond. For 1988/89 no aircraft barometer was available. Any elevation data for this season was based on interpolation between surface points of known elevation (from surface differential GPS survey) assuming constant rate of change of aircraft elevation (approx. 5200 km of lfight path). For 1989/90 season a digital barometer was logged every 20 s on board the aircraft and elevations were produced using aircraft-surface separations from the ice radar record (approx. 4100 km of flight path). The data have been checked by comparison (crossover) to other available datasets for the region. Pseudo-range GPS (without selective availability; SA) available for part of the 1988/89 (limited GPS constellation) and all the 1989/90 data sets; accurate to 30-100 m, digitally logged every 20 s. Dead-reckoning elsewhere; with reference to visual landmarks or features recognisable on Landsat imagery; accurate to within several kilometres. An entry of -9999 in the spreadsheet indicates null data.&rft.creator=Allison, I. &rft.creator=ALLISON, IAN &rft.date=1999&rft.coverage=westlimit=63.0; southlimit=-74.0; eastlimit=82.0; northlimit=-68.0&rft.coverage=westlimit=63.0; southlimit=-74.0; eastlimit=82.0; northlimit=-68.0&rft_rights=BandW 35 mm film for RES aircraft-surface separation data. Digital barometer for aircraft elevation data. Data stored on a spreadsheet (MS Excel) geocoded files. These data are publicly available for download from the provided URL.&rft_rights=Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/legalcode&rft_rights=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=Amery_Ht_88-89 when using these data.&rft_rights=This metadata record is publicly available.&rft_subject=geoscientificInformation&rft_subject=inlandWaters&rft_subject=oceans&rft_subject=EARTH SCIENCE > CRYOSPHERE > GLACIERS/ICE SHEETS > GLACIER ELEVATION/ICE SHEET ELEVATION&rft_subject=ANTARCTICA&rft_subject=BED ELEVATION&rft_subject=BEDMAP&rft_subject=ICE THICKNESS&rft_subject=LATITUDE&rft_subject=LONGITUDE&rft_subject=MISSION ID&rft_subject=RADIO ECHO SOUNDING&rft_subject=RES&rft_subject=SOUTHERN PRINCE CHARLES MOUNTAINS&rft_subject=SURFACE ELEVATION&rft_subject=WATER COLUMN THICKNESS&rft_subject=Aircraft&rft_subject=AMD/AU&rft_subject=CEOS&rft_subject=AMD&rft_subject=ACE/CRC&rft_subject=CONTINENT > ANTARCTICA > Amery Ice Shelf&rft_subject=GEOGRAPHIC REGION > POLAR&rft.type=dataset&rft.language=English Access the data
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Attribution 4.0 International (CC BY 4.0)
https://creativecommons.org/licenses/by/4.0/legalcode

BandW 35 mm film for RES aircraft-surface separation data. Digital barometer for aircraft elevation data. Data stored on a spreadsheet (MS Excel) geocoded files. These data are publicly available for download from the provided URL.

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=Amery_Ht_88-89 when using these data.

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Full description

A Lambert Glacier - Amery Ice Shelf series of airborne (Squirrel helicopter and Twin Otter fixed wing) RES and surface elevation profiles were conducted over two summer seasons; 1988/89 and 1989/90. Altogether nearly 10,000 km of various flight paths were undertaken, operating out of Mawson (67.60 S, 62.88 E), Davis (68.58 S, 77.97 E), Dovers (70.22 S, 65.87 E) or Beaver Lake (70.80 S, 68.18 E).

More information can be found at the BEDMAP website.

The fields in this dataset are:

mission_id (unique mission identifier)
latitude (decimal degrees)
longitude (decimal degrees)
ice_thickness (m)
surface_elevation (m)
water_column_thickness (m)
bed_elevation (m)

Lineage

Progress Code: completed
Statement: Gaps in the data exceeded 50% for 1988/89 (lack of digital barometer), but formed a largely complete set for 1989/90. The ANARE Mk V 100 MHz ice radar produced peak power of 4 kW with a pulse duration of 250 ns and repetition rate of 10 kHz. A logarithmic amplifier stage was incorporated into the system. Fixed wing (Twin Otter) antenna array consisted of a transmit and receive yagi (1 driven element, 1 director, aircraft wing as reflector); helicopter (AS350B Squirrel) antenna array consisted of a single-element in a pseudo-corner corner reflector arrangement beneath the aircraft body. Typical flight speeds were 240 km/hr (Twin Otter) and 180 km/hr (Squirrel). Typical flight altitudes were 300 m above the terrain surface for both aircraft. Data was recorded continuously on 35mm BandW film, later scaled by hand every 20 s of flight time (approximately 1 km). Delay times were reduced to aircraft-surface separations assuming a signal propagation speed of 300 m/microsecond. For 1988/89 no aircraft barometer was available. Any elevation data for this season was based on interpolation between surface points of known elevation (from surface differential GPS survey) assuming constant rate of change of aircraft elevation (approx. 5200 km of lfight path). For 1989/90 season a digital barometer was logged every 20 s on board the aircraft and elevations were produced using aircraft-surface separations from the ice radar record (approx. 4100 km of flight path). The data have been checked by comparison (crossover) to other available datasets for the region. Pseudo-range GPS (without selective availability; SA) available for part of the 1988/89 (limited GPS constellation) and all the 1989/90 data sets; accurate to 30-100 m, digitally logged every 20 s. Dead-reckoning elsewhere; with reference to visual landmarks or features recognisable on Landsat imagery; accurate to within several kilometres. An entry of -9999 in the spreadsheet indicates null data.

Data time period: 1988-12-01 to 1989-12-31

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82,-68 82,-74 63,-74 63,-68 82,-68

72.5,-71

text: westlimit=63.0; southlimit=-74.0; eastlimit=82.0; northlimit=-68.0

Subjects
ACE/CRC | AMD | AMD/AU | ANTARCTICA | Aircraft | BED ELEVATION | BEDMAP | CEOS | CONTINENT > ANTARCTICA > Amery Ice Shelf | EARTH SCIENCE > CRYOSPHERE > GLACIERS/ICE SHEETS > GLACIER ELEVATION/ICE SHEET ELEVATION | GEOGRAPHIC REGION > POLAR | ICE THICKNESS | LATITUDE | LONGITUDE | MISSION ID | RADIO ECHO SOUNDING | RES | SOUTHERN PRINCE CHARLES MOUNTAINS | SURFACE ELEVATION | WATER COLUMN THICKNESS | geoscientificInformation | inlandWaters | oceans |

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Other Information
Download page for the data (GET DATA)

url : http://data.aad.gov.au/aadc/portal/download_file.cfm?file_id=1299

BEDMAP Website (PROJECT HOME PAGE)

url : http://www.antarctica.ac.uk/bedmap

Citation reference for this metadata record and dataset (VIEW RELATED INFORMATION)

url : http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=Amery_Ht_88-89

Identifiers
  • global : Amery_Ht_88-89
ACN 633 798 857