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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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investigating-the-dynamic-history-of-a-promontory-ice-rise-using-radar-data.pdf (Verlagsversion), 6MB
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2025
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 Urheber:
Ershadi, M. Reza, Autor
Drews, Reinhard, Autor
Tison, Jean-Louis, Autor
Martín, Carlos, Autor
Henry, A. Clara J.1, 2, Autor                 
Oraschewski, Falk Marius, Autor
Tsibulskaya, Veronica, Autor
Sun, Sainan, Autor
Wauthy, Sarah, Autor
Koch, Inka, Autor
Bons, Paul Dirk, Autor
Eisen, Olaf, Autor
Pattyn, Frank, Autor
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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Schlagwörter: Anisotropic ice, antarctic glaciology, ice core, ice rise, radio-echo sounding
 Zusammenfassung: 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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Sprache(n): eng - English
 Datum: 2024-08-092023-09-202024-08-132024-10-212025
 Publikationsstatus: Erschienen
 Seiten: 14
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1017/jog.2024.70
BibTex Citekey: ErshadiDrewsEtAl2025
 Art des Abschluß: -

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

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Titel: Journal of Glaciology
Genre der Quelle: Zeitschrift
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Affiliations:
Ort, Verlag, Ausgabe: Cambridge [etc.] : British Glaciological Society.
Seiten: - Band / Heft: 71 Artikelnummer: e1 Start- / Endseite: - Identifikator: ISSN: 0022-1430
CoNE: https://pure.mpg.de/cone/journals/resource/954925413902
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