Radiometrically optimized radar sounding of ice sheets
Abstract/Contents
- Abstract
- Remote sensing of the cryosphere, in particular polar ice sheets (Greenland and Antarctica), has been transformed by the development of ice-penetrating radar systems and analysis techniques. Recent technical advances in radar sounding systems have focused largely on improving range and azimuth resolution to provide more detailed topographic information on the ice-bed interface, where ice meets the material beneath it. However, reducing uncertainty in large-scale numerical ice-sheet models will require more precise characterization of subsurface conditions, including the basal conditions and englacial thermal state. Characterizing these subsurface properties with existing ice-penetrating radars is challenging due to the ambiguities inherent in ice-penetrating radar data and due to the reliance on assumptions of ice-sheet physics often required to interpret these data. Here we show how a new ice-penetrating radar system architecture, consisting of a multi-frequency joint radar-radiometer, can be used to reduce ambiguities and provide higher fidelity measurements of ice sheet basal conditions and englacial thermal state. We show in simulation that a narrowband multi-frequency radar, with center frequencies spanning two orders of magnitude, is able to discriminate basal roughness and basal material properties. We also demonstrate in simulation that radar attenuation and radiometer brightness temperature measurements can be combined to constrain vertical temperature profiles within the ice. Finally, we demonstrate the successful implementation and deployment of an open-source towed, coherent, chirped ice-penetrating radar that is easily reconfigurable, depending on a user's needs. Results from recent field campaigns in Greenland and Antarctica demonstrate that this system can be an effective and relatively low-cost solution for studying ice-sheet processes at the glacier to catchment scale.
Description
| Type of resource | text |
|---|---|
| Form | electronic resource; remote; computer; online resource |
| Extent | 1 online resource. |
| Place | California |
| Place | [Stanford, California] |
| Publisher | [Stanford University] |
| Copyright date | 2024; ©2024 |
| Publication date | 2024; 2024 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Author | Broome, Anna Lamkin |
|---|---|
| Degree supervisor | Schroeder, Dustin |
| Thesis advisor | Schroeder, Dustin |
| Thesis advisor | Pauly, John (John M.) |
| Thesis advisor | Zebker, Howard A |
| Degree committee member | Pauly, John (John M.) |
| Degree committee member | Zebker, Howard A |
| Associated with | Stanford University, School of Engineering |
| Associated with | Stanford University, Department of Electrical Engineering |
Subjects
| Genre | Theses |
|---|---|
| Genre | Text |
Bibliographic information
| Statement of responsibility | Anna Lamkin Broome. |
|---|---|
| Note | Submitted to the Department of Electrical Engineering. |
| Thesis | Thesis Ph.D. Stanford University 2024. |
| Location | https://purl.stanford.edu/wb542pv6009 |
Access conditions
- Copyright
- © 2024 by Anna Lamkin Broome
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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