Helicopter-borne ground penetrating radar measurements on the Sørsdal Glacier 2017-2018

• Other Authors: THOMPSON, SARAH (hasPrincipalInvestigator), THOMPSON, SARAH (processor), SCHOOF, CHRISTIAN (hasPrincipalInvestigator), Australian Antarctic Data Centre (publisher)
• Format: Dataset
• Language: unknown
• Published: Australian Antarctic Data Centre
• Subjects: inlandWaters; GLACIERS; EARTH SCIENCE; CRYOSPHERE; GLACIERS/ICE SHEETS; ICE GROWTH/MELT; SNOW/ICE; MALÅ PROEX RADAR; MALÅ 100 MHZ SHIELDED ANTENNA; MELTWATER CHANNEL; GLACIER HYDROLOGY; GPR > Ground Penetrating Radar; HELICOPTER; GEOGRAPHIC REGION > POLAR; CONTINENT > ANTARCTICA > SØRSDAL GLACIER; PRINCESS ELIZABETH LAND; DAVIS STATION; Channel Glacier; Davis Station; Davis-Station; Princess Elizabeth Land; Sørsdal Glacier; Antarc*; Antarctica
• Online Access: https://researchdata.ands.org.au/helicopter-borne-ground-2017-2018/1449641; https://doi.org/10.26179/5e7adfa5a8859; https://data.aad.gov.au/metadata/records/AAS_4342_HeloGPR_2017-2018; http://nla.gov.au/nla.party-617536

Ground penetrating radar (GPR) is an active geophysical technique that uses high frequency radio waves to map the subsurface. The basic principle of GPR measurements is the transition of electromagnetic pulses of suitable frequency down into the ground through a transmitting antenna, and to detect the reflected energy as a function of time, amplitude and phase from any subsurface targets through a receiver antenna. If the electromagnetic travel velocity of the subsurface is known, time can be converted to depth. Wave reflections are generated from the boundaries of materials of different electromagnetic properties. The large contrast between the electromagnetic properties of rock, ice, water, and some sediments makes GPR a particularly effective method for mapping in frozen environments. A Måla ProEx radar system with a shielded antenna, centre frequency 100 MHz, connected to a handheld Garmin GPS. The antenna was housed in wooden box, slung on a longline, 15 metres long, from the helicopter cargo hook. Two surveys were carried out on the Sørsdal Glacier with the aim of mapping englacial meltwater channels. Outer survey bounds -68.66, 78.302 -68.65, 78.532 -68.72, 78.544 -68.73, 78.313 Survey 1 - 21/12/2017 - 11 parallel survey lines 8 km long and 2 cross profiles 3.2 km long Survey 2 - 22/01/2018 - 12 survey lines 1.3 km long