On the link between surface and basal structures of the Jelbart Ice Shelf, Antarctica
To understand the dynamics of ice shelves, a knowledge of their internal and basal structure is very important. As the capacity to perform local surveys is limited, remote sensing provides an opportunity to obtain the relevant information. We must prove, however, that the relevant information can be...
Published in: | Journal of Glaciology |
---|---|
Main Authors: | , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
INT GLACIOL SOC
2015
|
Subjects: | |
Online Access: | https://epic.awi.de/id/eprint/38948/ https://hdl.handle.net/10013/epic.46208 |
id |
ftawi:oai:epic.awi.de:38948 |
---|---|
record_format |
openpolar |
spelling |
ftawi:oai:epic.awi.de:38948 2023-05-15T13:40:27+02:00 On the link between surface and basal structures of the Jelbart Ice Shelf, Antarctica Humbert, Angelika Steinhage, Daniel Helm, Veit Hoerz, Sebastian Behrendt, Jacqueline Leipprandt, Elke Christmann, Julia Plate, Carolin Müller, Ralf 2015 https://epic.awi.de/id/eprint/38948/ https://hdl.handle.net/10013/epic.46208 unknown INT GLACIOL SOC Humbert, A. , Steinhage, D. orcid:0000-0003-4737-9751 , Helm, V. orcid:0000-0001-7788-9328 , Hoerz, S. , Behrendt, J. , Leipprandt, E. , Christmann, J. , Plate, C. and Müller, R. (2015) On the link between surface and basal structures of the Jelbart Ice Shelf, Antarctica , Journal of Glaciology, 61 (229), pp. 975-986 . doi:10.3189/2015JoG15J023 <https://doi.org/10.3189/2015JoG15J023> , hdl:10013/epic.46208 EPIC3Journal of Glaciology, INT GLACIOL SOC, 61(229), pp. 975-986, ISSN: 0022-1430 Article isiRev 2015 ftawi https://doi.org/10.3189/2015JoG15J023 2021-12-24T15:40:48Z To understand the dynamics of ice shelves, a knowledge of their internal and basal structure is very important. As the capacity to perform local surveys is limited, remote sensing provides an opportunity to obtain the relevant information. We must prove, however, that the relevant information can be obtained from remote sensing of the surface. That is the aim of this study. The Jelbart Ice Shelf, Antarctica, exhibits a variety of surface structures appearing as stripe-like features in radar imagery. We performed an airborne geophysical survey across these features and compared the results to TerraSAR-X imagery. We find that the stripe-like structures indicate surface troughs coinciding with the location of basal channels and crevasse-like features, revealed by radio-echo sounding. HH and VV polarizations do not show different magnitude. In surface troughs, the local accumulation rate is larger than at the flat surface. Viscoelastic modelling is used to gain an understanding of the surface undulations and their origin. The surface displacement, computed with a Maxwell model, matches the observed surface reasonably well. Our simulations show that the surface troughs develop over decadal to centennial timescales. Article in Journal/Newspaper Antarc* Antarctica Antarctica Journal Ice Shelf Ice Shelves Jelbart Ice Shelf Journal of Glaciology Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Jelbart Ice Shelf ENVELOPE(-4.500,-4.500,-70.500,-70.500) Stripe ENVELOPE(9.914,9.914,63.019,63.019) Journal of Glaciology 61 229 975 986 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
To understand the dynamics of ice shelves, a knowledge of their internal and basal structure is very important. As the capacity to perform local surveys is limited, remote sensing provides an opportunity to obtain the relevant information. We must prove, however, that the relevant information can be obtained from remote sensing of the surface. That is the aim of this study. The Jelbart Ice Shelf, Antarctica, exhibits a variety of surface structures appearing as stripe-like features in radar imagery. We performed an airborne geophysical survey across these features and compared the results to TerraSAR-X imagery. We find that the stripe-like structures indicate surface troughs coinciding with the location of basal channels and crevasse-like features, revealed by radio-echo sounding. HH and VV polarizations do not show different magnitude. In surface troughs, the local accumulation rate is larger than at the flat surface. Viscoelastic modelling is used to gain an understanding of the surface undulations and their origin. The surface displacement, computed with a Maxwell model, matches the observed surface reasonably well. Our simulations show that the surface troughs develop over decadal to centennial timescales. |
format |
Article in Journal/Newspaper |
author |
Humbert, Angelika Steinhage, Daniel Helm, Veit Hoerz, Sebastian Behrendt, Jacqueline Leipprandt, Elke Christmann, Julia Plate, Carolin Müller, Ralf |
spellingShingle |
Humbert, Angelika Steinhage, Daniel Helm, Veit Hoerz, Sebastian Behrendt, Jacqueline Leipprandt, Elke Christmann, Julia Plate, Carolin Müller, Ralf On the link between surface and basal structures of the Jelbart Ice Shelf, Antarctica |
author_facet |
Humbert, Angelika Steinhage, Daniel Helm, Veit Hoerz, Sebastian Behrendt, Jacqueline Leipprandt, Elke Christmann, Julia Plate, Carolin Müller, Ralf |
author_sort |
Humbert, Angelika |
title |
On the link between surface and basal structures of the Jelbart Ice Shelf, Antarctica |
title_short |
On the link between surface and basal structures of the Jelbart Ice Shelf, Antarctica |
title_full |
On the link between surface and basal structures of the Jelbart Ice Shelf, Antarctica |
title_fullStr |
On the link between surface and basal structures of the Jelbart Ice Shelf, Antarctica |
title_full_unstemmed |
On the link between surface and basal structures of the Jelbart Ice Shelf, Antarctica |
title_sort |
on the link between surface and basal structures of the jelbart ice shelf, antarctica |
publisher |
INT GLACIOL SOC |
publishDate |
2015 |
url |
https://epic.awi.de/id/eprint/38948/ https://hdl.handle.net/10013/epic.46208 |
long_lat |
ENVELOPE(-4.500,-4.500,-70.500,-70.500) ENVELOPE(9.914,9.914,63.019,63.019) |
geographic |
Jelbart Ice Shelf Stripe |
geographic_facet |
Jelbart Ice Shelf Stripe |
genre |
Antarc* Antarctica Antarctica Journal Ice Shelf Ice Shelves Jelbart Ice Shelf Journal of Glaciology |
genre_facet |
Antarc* Antarctica Antarctica Journal Ice Shelf Ice Shelves Jelbart Ice Shelf Journal of Glaciology |
op_source |
EPIC3Journal of Glaciology, INT GLACIOL SOC, 61(229), pp. 975-986, ISSN: 0022-1430 |
op_relation |
Humbert, A. , Steinhage, D. orcid:0000-0003-4737-9751 , Helm, V. orcid:0000-0001-7788-9328 , Hoerz, S. , Behrendt, J. , Leipprandt, E. , Christmann, J. , Plate, C. and Müller, R. (2015) On the link between surface and basal structures of the Jelbart Ice Shelf, Antarctica , Journal of Glaciology, 61 (229), pp. 975-986 . doi:10.3189/2015JoG15J023 <https://doi.org/10.3189/2015JoG15J023> , hdl:10013/epic.46208 |
op_doi |
https://doi.org/10.3189/2015JoG15J023 |
container_title |
Journal of Glaciology |
container_volume |
61 |
container_issue |
229 |
container_start_page |
975 |
op_container_end_page |
986 |
_version_ |
1766134711630954496 |