Multisystem Synthesis of Radar Sounding Observations of the Amundsen Sea Sector From the 2004–2005 Field Season
Open Access
- 22 October 2021
- journal article
- research article
- Published by American Geophysical Union (AGU) in Journal of Geophysical Research: Earth Surface
- Vol. 126 (10)
- https://doi.org/10.1029/2021jf006296
Abstract
The Amundsen Sea Embayment of the West Antarctic Ice Sheet contains Thwaites and Pine Island Glaciers, two of the most rapidly changing glaciers in Antarctica. To date, Pine Island and Thwaites Glaciers have only been observed by independent airborne radar sounding surveys, but a combined cross-basin analysis that investigates the basal conditions across the Pine Island-Thwaites Glaciers boundary has not been performed. Here, we combine two radar surveys and correct for their differences in system parameters to produce unified englacial attenuation and basal relative reflectivity maps spanning both Pine Island and Thwaites Glaciers. Relative reflectivities range from -24.8 to +37.4 dB with the highest values beneath fast-flowing ice at the ice sheet margin. By comparing our reflectivity results with previously derived radar specularity and trailing bed echoes at Thwaites Glacier, we find a highly diverse subglacial landscape and hydrologic conditions that evolve along-flow. Together, these findings highlight the potential for joint airborne radar analysis with ground-based seismic and geomorphological observations to understand variations in the bed properties and cross-catchment interactions of ice streams and outlet glaciers.Keywords
Funding Information
- National Aeronautics and Space Administration (NNX16AJ95G)
- National Science Foundation (1745137)
This publication has 73 references indexed in Scilit:
- Evidence for a water system transition beneath Thwaites Glacier, West AntarcticaProceedings of the National Academy of Sciences of the United States of America, 2013
- Stronger ocean circulation and increased melting under Pine Island Glacier ice shelfNature Geoscience, 2011
- Pitfalls in radar diagnosis of ice-sheet bed conditions: Lessons from englacial attenuation modelsGeophysical Research Letters, 2011
- A subglacial water-flow model for West AntarcticaJournal of Glaciology, 2009
- A recent volcanic eruption beneath the West Antarctic ice sheetNature Geoscience, 2008
- Why Is It Hard to Predict the Future of Ice Sheets?Science, 2007
- The morphological characteristics of ribbed moraineQuaternary Science Reviews, 2006
- New boundary conditions for the West Antarctic ice sheet: Subglacial topography beneath Pine Island GlacierGeophysical Research Letters, 2006
- New boundary conditions for the West Antarctic Ice Sheet: Subglacial topography of the Thwaites and Smith glacier catchmentsGeophysical Research Letters, 2006
- Assessment of the importance of ice‐shelf buttressing to ice‐sheet flowGeophysical Research Letters, 2005