2022-2023 USAP Field Season
Investigating ice sheet - solid Earth feedbacks in West Antarctica: implications for ice sheet evolution and stability
Dr. Terry Wilson
Supporting Stations: McMurdo Station
The Polar Earth Observing Network-Antarctic Network (POLENET-ANET) autonomous GPS and seismic network has been reconfigured to acquire higher-resolution in-situ data around the Amundsen Embayment. The network captures spatially varying crustal motions and Earth structure in a region where the ice sheet is rapidly changing. Observations will be integrated into three-dimensional modeling to investigate the solid-earth cryosphere feedback processes that influence the past, present, and future behavior of the West Antarctic Ice Sheet (WAIS). Advanced models, constrained by the new observations, will improve estimates of West Antarctic ice-mass changes, establish where the WAIS may be stabilized by ongoing Earth deformation, and reduce uncertainties in future sea-level-change projections.
Field Season Overview
A team of six participants, including one T-295-M UNAVCO engineer and two T-299-M PASSCAL engineers who will swap mid-season, will service existing GPS/seismic stations of the POLENET/ANET network in West Antarctica. Service and maintenance work includes excavation of instrumentation from beneath years of accumulated snow, collection of project seismic data, equipment replacements, and battery replacement to ensure continued data collection. The team will be based out of WAIS Divide and later Siple Dome, and will make day trips by Twin Otter to the station sites. They will access 17 sites from WAIS Divide and six sites from Siple Dome, with some sites requiring multiple Twin Otters on a single day or over multiple days to ensure full maintenance needs are met during limited weather windows.
Deploying Team Members