Bistatic Radar Tomography of Shear Margins: Simulated Temperature and Basal Material Inversions

Bienert, N. L.; Schroeder, Dustin M.; Summers, Paul

doi:10.1109/tgrs.2022.3213047

Cited by 1 publication

(1 citation statement)

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“…The evidence we present here can help motivate and select future study sites for improved, temperature focused radar survey techniques like those proposed by Yardim et al (2022), Bienert et al (2023), andBroome et al (2023). Similarly, comprehensive ice flow models incorporating the 3D velocity field can be applied to specific field sites for data-model integration like Holschuh et al (2019) and assimilation of temperature into ice flow models can provide future improvements, similar to suggestions by Dawson et al (2024).…”

Section: Discussionmentioning

confidence: 55%

Evidence for and Against Temperate Ice in Antarctic Shear Margins From Radar‐Depth Sounding Data

Summers,

Schroeder,

May

et al. 2024

Geophysical Research Letters

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The majority of ice mass loss from Antarctica flows through narrow, fast sliding regions of ice. The lateral boundaries of these regions, termed shear margins, are characterized by lateral shear strains in excess of ∼10−3 yr−1. Shear heating within these margins could warm ice significantly–even to the melting point–but other processes such as lateral advection of cold ice and fabric development compete with this effect. Radar observations can help constrain where temperate ice exists because englacial temperature increases electric conductivity which increases radar attenuation. We utilize the temperature‐dependent attenuation of ice to develop a novel method for constraining englacial temperature in shear margins by combining existing thermal models with very high frequency radar depth‐sounding data. We find evidence supporting temperate shear margins in 18 locations and find evidence for non‐temperate margins in 37 locations, notably in the Amundsen Sea Embayment.

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