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  Investigating the dynamic history of a promontory ice rise using radar data

Ershadi, M. R., Drews, R., Tison, J.-L., Martín, C., Henry, A. C. J., Oraschewski, F. M., et al. (2025). Investigating the dynamic history of a promontory ice rise using radar data. Journal of Glaciology, 71: e1. doi:10.1017/jog.2024.70.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0010-831D-A Version Permalink: https://hdl.handle.net/21.11116/0000-0010-87D4-6
Genre: Journal Article

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 Creators:
Ershadi, M. Reza, Author
Drews, Reinhard, Author
Tison, Jean-Louis, Author
Martín, Carlos, Author
Henry, A. Clara J.1, 2, Author                 
Oraschewski, Falk Marius, Author
Tsibulskaya, Veronica, Author
Sun, Sainan, Author
Wauthy, Sarah, Author
Koch, Inka, Author
Bons, Paul Dirk, Author
Eisen, Olaf, Author
Pattyn, Frank, Author
Affiliations:
1IMPRS on Earth System Modelling, MPI for Meteorology, Max Planck Society, ou_913547              
2Ocean Physics, Department Climate Variability, MPI for Meteorology, Max Planck Society, ou_913557              

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Free keywords: Anisotropic ice, antarctic glaciology, ice core, ice rise, radio-echo sounding
 Abstract: Ice rises hold valuable records revealing the ice dynamics and climatic history of Antarctic coastal areas from the Last Glacial Maximum to today. This history is often reconstructed from isochrone radar stratigraphy and simulations focusing on Raymond arch evolution beneath the divides. However, this relies on complex ice-flow models where many parameters are unconstrained by observations. Our study explores quad-polarimetric, phase-coherent radar data to enhance understanding near ice divides and domes, using Hammarryggen Ice Rise (HIR) as a case study. Analysing a 5 km profile intersecting the dome, we derive vertical strain rates and ice-fabric properties. These align with ice core data near the summit, increasing confidence in tracing signatures from the dome to the flanks. The Raymond effect is evident, correlating with surface strain rates and radar stratigraphy. Stability is inferred over millennia for the saddle connecting HIR to the mainland, but dome ice-fabric appears relatively young compared to 2D model predictions. In a broader context, quad-polarimetric measurements provide valuable insights into ice-flow models, particularly for anisotropic rheology. Including quad-polarimetric data advances our ability to reconstruct past ice flow dynamics and climatic history in ice rises.

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Language(s): eng - English
 Dates: 2024-08-092023-09-202024-08-132024-10-212025
 Publication Status: Issued
 Pages: 14
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1017/jog.2024.70
BibTex Citekey: ErshadiDrewsEtAl2025
 Degree: -

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Project name : Emmy Noether grant
Grant ID : DR 822/3-1
Funding program : -
Funding organization : Deutsche Forschungsgemeinschaft (DFG)
Project name : 1158'Antarctic Research
Grant ID : SCHA 2139/1-1
Funding program : -
Funding organization : Deutsche Forschungsgemeinschaft (DFG)
Project name : Scholarship
Grant ID : -
Funding program : -
Funding organization : Studienstiftung des Deutschen Volkes
Project name : Research Fellow grant
Grant ID : -
Funding program : -
Funding organization : F.R.S.-F.N.R.S
Project name : East Antarctic surface mass balance in the Anthropocene: observations and multi-scale modeling (Mass2Ant)
Grant ID : BR/165/A2/Mass2Ant
Funding program : -
Funding organization : The Belgian Research Action through Interdisciplinary Networks (BRAIN-be) from the Belgian Science Policy Office (BELSPO)

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Title: Journal of Glaciology
Source Genre: Journal
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Publ. Info: Cambridge [etc.] : British Glaciological Society.
Pages: - Volume / Issue: 71 Sequence Number: e1 Start / End Page: - Identifier: ISSN: 0022-1430
CoNE: https://pure.mpg.de/cone/journals/resource/954925413902
 
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