Subsurface Radar Investigations at the Pegasus Glacial-Ice Runway and Williams Field, McMurdo Station, Antarctica.
Subsurface radar was used to profile ice and snow conditions on the Ross Ice Shelf at McMurdo Station, Antarctica, during mid-January 1993. Deconvolution and migration were often used to improve vertical resolution and spatial imaging. Profiles at a pulse center frequency of 400 MHz along the 3.2-km...
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1994
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ftdtic:ADA289323 2023-05-15T13:53:48+02:00 Subsurface Radar Investigations at the Pegasus Glacial-Ice Runway and Williams Field, McMurdo Station, Antarctica. Arcone, Steven A. Delaney, Allan J. Toblasson, Wayne COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH 1994-11 text/html http://www.dtic.mil/docs/citations/ADA289323 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA289323 en eng http://www.dtic.mil/docs/citations/ADA289323 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Terminal Flight Facilities Snow Ice and Permafrost Active & Passive Radar Detection & Equipment Solid Wastes Pollution and Control *ENVIRONMENTAL IMPACT *BIOLOGICAL CONTAMINATION *RADAR EQUIPMENT *SOLID WASTES *RUNWAYS *LAND ICE *SEWAGE DISPOSAL SPATIAL DISTRIBUTION WAVEFORMS FIELD TESTS REFLECTION DEPTH FUELS DIELECTRIC PROPERTIES ANTENNAS MIGRATION LOW DENSITY BURIED OBJECTS WASTE DISPOSAL SITE INVESTIGATIONS POLARITY EXCAVATION SUBSURFACE INTRUSION SPILLING ANTARCTIC REGIONS SUMPS BRINES ROSS SEA GLACIAL GEOLOGY MCMURDO SOUND (ANTARCTICA) SUBSURFACE RADAR Text 1994 ftdtic 2016-02-19T11:52:47Z Subsurface radar was used to profile ice and snow conditions on the Ross Ice Shelf at McMurdo Station, Antarctica, during mid-January 1993. Deconvolution and migration were often used to improve vertical resolution and spatial imaging. Profiles at a pulse center frequency of 400 MHz along the 3.2-km-long Pegasus ice runway show many low-density horizons above 9 m depth that are up to 30 m long. They are associated with air bubbles included during refreezing of meltwater and are interpreted as layers between a few and tens of centimeters thick. There is a strong reflecting horizon at about 9 m depth that is probably from brine intrusion as it is continuous with the intrusion into the snow to the east. Diffraction asymptotes give a dielectric constant near 3.2 for material above the brine level, a value that implies near-solid ice. Profiles at 100 MHz along the road between Pegasus runway and Williams Field in the accumulation zone show snow features such as layer deformation and intrusive brine layers that both abruptly and gradually change in depth. A single profile at a relic solid waste dump at Williams Field detected buried debris and ice within the upper 7 m. A survey of a suspected fuel spill shows some local disturbances near the center, but no excavation was done to verify the findings. Profiles traversing the sewage sumps at Williams Field outline the extent of the sewage deposition, and give depths to contaminated snow that closely agree with observation. Despite variability in dielectric properties, single-layer migration effectively improves the resolution of subsurface conditions. Recommendations are made for future surveys. Text Antarc* Antarctic Antarctica Ice Ice Shelf McMurdo Sound permafrost Ross Ice Shelf Ross Sea Defense Technical Information Center: DTIC Technical Reports database Antarctic Ross Sea McMurdo Sound Ross Ice Shelf McMurdo Station ENVELOPE(166.667,166.667,-77.850,-77.850) Ice Runway ENVELOPE(166.469,166.469,-77.854,-77.854) Williams Field ENVELOPE(166.967,166.967,-77.867,-77.867) |
institution |
Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Terminal Flight Facilities Snow Ice and Permafrost Active & Passive Radar Detection & Equipment Solid Wastes Pollution and Control *ENVIRONMENTAL IMPACT *BIOLOGICAL CONTAMINATION *RADAR EQUIPMENT *SOLID WASTES *RUNWAYS *LAND ICE *SEWAGE DISPOSAL SPATIAL DISTRIBUTION WAVEFORMS FIELD TESTS REFLECTION DEPTH FUELS DIELECTRIC PROPERTIES ANTENNAS MIGRATION LOW DENSITY BURIED OBJECTS WASTE DISPOSAL SITE INVESTIGATIONS POLARITY EXCAVATION SUBSURFACE INTRUSION SPILLING ANTARCTIC REGIONS SUMPS BRINES ROSS SEA GLACIAL GEOLOGY MCMURDO SOUND (ANTARCTICA) SUBSURFACE RADAR |
spellingShingle |
Terminal Flight Facilities Snow Ice and Permafrost Active & Passive Radar Detection & Equipment Solid Wastes Pollution and Control *ENVIRONMENTAL IMPACT *BIOLOGICAL CONTAMINATION *RADAR EQUIPMENT *SOLID WASTES *RUNWAYS *LAND ICE *SEWAGE DISPOSAL SPATIAL DISTRIBUTION WAVEFORMS FIELD TESTS REFLECTION DEPTH FUELS DIELECTRIC PROPERTIES ANTENNAS MIGRATION LOW DENSITY BURIED OBJECTS WASTE DISPOSAL SITE INVESTIGATIONS POLARITY EXCAVATION SUBSURFACE INTRUSION SPILLING ANTARCTIC REGIONS SUMPS BRINES ROSS SEA GLACIAL GEOLOGY MCMURDO SOUND (ANTARCTICA) SUBSURFACE RADAR Arcone, Steven A. Delaney, Allan J. Toblasson, Wayne Subsurface Radar Investigations at the Pegasus Glacial-Ice Runway and Williams Field, McMurdo Station, Antarctica. |
topic_facet |
Terminal Flight Facilities Snow Ice and Permafrost Active & Passive Radar Detection & Equipment Solid Wastes Pollution and Control *ENVIRONMENTAL IMPACT *BIOLOGICAL CONTAMINATION *RADAR EQUIPMENT *SOLID WASTES *RUNWAYS *LAND ICE *SEWAGE DISPOSAL SPATIAL DISTRIBUTION WAVEFORMS FIELD TESTS REFLECTION DEPTH FUELS DIELECTRIC PROPERTIES ANTENNAS MIGRATION LOW DENSITY BURIED OBJECTS WASTE DISPOSAL SITE INVESTIGATIONS POLARITY EXCAVATION SUBSURFACE INTRUSION SPILLING ANTARCTIC REGIONS SUMPS BRINES ROSS SEA GLACIAL GEOLOGY MCMURDO SOUND (ANTARCTICA) SUBSURFACE RADAR |
description |
Subsurface radar was used to profile ice and snow conditions on the Ross Ice Shelf at McMurdo Station, Antarctica, during mid-January 1993. Deconvolution and migration were often used to improve vertical resolution and spatial imaging. Profiles at a pulse center frequency of 400 MHz along the 3.2-km-long Pegasus ice runway show many low-density horizons above 9 m depth that are up to 30 m long. They are associated with air bubbles included during refreezing of meltwater and are interpreted as layers between a few and tens of centimeters thick. There is a strong reflecting horizon at about 9 m depth that is probably from brine intrusion as it is continuous with the intrusion into the snow to the east. Diffraction asymptotes give a dielectric constant near 3.2 for material above the brine level, a value that implies near-solid ice. Profiles at 100 MHz along the road between Pegasus runway and Williams Field in the accumulation zone show snow features such as layer deformation and intrusive brine layers that both abruptly and gradually change in depth. A single profile at a relic solid waste dump at Williams Field detected buried debris and ice within the upper 7 m. A survey of a suspected fuel spill shows some local disturbances near the center, but no excavation was done to verify the findings. Profiles traversing the sewage sumps at Williams Field outline the extent of the sewage deposition, and give depths to contaminated snow that closely agree with observation. Despite variability in dielectric properties, single-layer migration effectively improves the resolution of subsurface conditions. Recommendations are made for future surveys. |
author2 |
COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH |
format |
Text |
author |
Arcone, Steven A. Delaney, Allan J. Toblasson, Wayne |
author_facet |
Arcone, Steven A. Delaney, Allan J. Toblasson, Wayne |
author_sort |
Arcone, Steven A. |
title |
Subsurface Radar Investigations at the Pegasus Glacial-Ice Runway and Williams Field, McMurdo Station, Antarctica. |
title_short |
Subsurface Radar Investigations at the Pegasus Glacial-Ice Runway and Williams Field, McMurdo Station, Antarctica. |
title_full |
Subsurface Radar Investigations at the Pegasus Glacial-Ice Runway and Williams Field, McMurdo Station, Antarctica. |
title_fullStr |
Subsurface Radar Investigations at the Pegasus Glacial-Ice Runway and Williams Field, McMurdo Station, Antarctica. |
title_full_unstemmed |
Subsurface Radar Investigations at the Pegasus Glacial-Ice Runway and Williams Field, McMurdo Station, Antarctica. |
title_sort |
subsurface radar investigations at the pegasus glacial-ice runway and williams field, mcmurdo station, antarctica. |
publishDate |
1994 |
url |
http://www.dtic.mil/docs/citations/ADA289323 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA289323 |
long_lat |
ENVELOPE(166.667,166.667,-77.850,-77.850) ENVELOPE(166.469,166.469,-77.854,-77.854) ENVELOPE(166.967,166.967,-77.867,-77.867) |
geographic |
Antarctic Ross Sea McMurdo Sound Ross Ice Shelf McMurdo Station Ice Runway Williams Field |
geographic_facet |
Antarctic Ross Sea McMurdo Sound Ross Ice Shelf McMurdo Station Ice Runway Williams Field |
genre |
Antarc* Antarctic Antarctica Ice Ice Shelf McMurdo Sound permafrost Ross Ice Shelf Ross Sea |
genre_facet |
Antarc* Antarctic Antarctica Ice Ice Shelf McMurdo Sound permafrost Ross Ice Shelf Ross Sea |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA289323 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766259267912859648 |