Imperial College London
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ProfessorMartinSiegert

Faculty of Natural Sciences, The Grantham Institute for Climate Change

Visiting Professor
 
 
 
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Contact

 

+44 (0)20 7594 9666m.siegert Website

 
 
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Assistant

 

Ms Gosia Gayer +44 (0)20 7594 9666

 
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Location

 

Grantham Directors OfficeSherfield BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Wrona:2017:10.1144/SP461.12,
author = {Wrona, T and Wolovick, M and Ferraccioli, F and Corr, H and Jordan, T and Siegert, MJ},
doi = {10.1144/SP461.12},
journal = {Special Publication - Geological Society of London},
title = {Position and variability of complex structures in the central East Antarctic Ice Sheet},
url = {http://dx.doi.org/10.1144/SP461.12},
volume = {461},
year = {2017}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Although the flow of the East Antarctic Ice Sheet is well constrained from surface measurements and altimetry, our knowledge of the dynamic processes within the ice sheet remains limited. Recent high-resolution radar data from the Gamburtsev Subglacial Mountains in central East Antarctica reveal a series of anomalous englacial reflectors in the lower half of the ice column that cannot be explained by conventional ice flow. Expanding on previous analyses, we describe the geometrical and morphological features of 12 of these anomalous reflectors. Our description reveals a previously unacknowledged diversity in size, geometry and internal structure of these reflectors. We are able to identify four distinct morphological features: (1) fingers; (2) inclusions; (3) sheets; and (4) folds. The ‘fingers’ and ‘inclusions’ probably form by shear instabilities at the boundary between the reflectors and the surrounding meteoric ice. The ‘sheets’ highlight that basal ice can be uplifted off of the bed and above surrounding meteoric ice, and the ‘folds’ may have formed in local regions of converging flow associated with subglacial topography. The study provides key insights into the rheology, stress and deformational regimes deep within the central East Antarctic Ice Sheet.
AU  - Wrona,T
AU  - Wolovick,M
AU  - Ferraccioli,F
AU  - Corr,H
AU  - Jordan,T
AU  - Siegert,MJ
DO  - 10.1144/SP461.12
PY  - 2017///
SN  - 0305-8719
TI  - Position and variability of complex structures in the central East Antarctic Ice Sheet
T2  - Special Publication - Geological Society of London
UR  - http://dx.doi.org/10.1144/SP461.12
UR  - http://hdl.handle.net/10044/1/48250
VL  - 461
ER  -
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