Uncertainty Assessment of Ice Discharge Using GPR-Derived Ice Thickness from Gourdon Glacier, Antarctic Peninsula
Ice cliffs within a glacier represent a challenge for the continuity equations used in many glacier models by interrupting the validity of input parameters. In the case of Gourdon Glacier on James Ross Island, Antarctica, a ∼300–500 m high, almost vertical cliff, separates the outlet glacier from it...
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Online Access: | https://opus4.kobv.de/opus4-fau/frontdoor/index/index/docId/12667 https://nbn-resolving.org/urn:nbn:de:bvb:29-opus4-126678 https://doi.org/10.3390/geosciences10010012 https://opus4.kobv.de/opus4-fau/files/12667/geosciences-10-00012.pdf |
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ftuniverlangen:oai:ub.uni-erlangen.de-opus:12667 2023-05-15T13:39:00+02:00 Uncertainty Assessment of Ice Discharge Using GPR-Derived Ice Thickness from Gourdon Glacier, Antarctic Peninsula Lippl, Stefan Blindow, Norbert Fürst, Johannes J. Marinsek, Sebastián Seehaus, Thorsten C. Braun, Matthias H. 2019-12-27 application/pdf https://opus4.kobv.de/opus4-fau/frontdoor/index/index/docId/12667 https://nbn-resolving.org/urn:nbn:de:bvb:29-opus4-126678 https://doi.org/10.3390/geosciences10010012 https://opus4.kobv.de/opus4-fau/files/12667/geosciences-10-00012.pdf eng eng https://opus4.kobv.de/opus4-fau/frontdoor/index/index/docId/12667 urn:nbn:de:bvb:29-opus4-126678 https://nbn-resolving.org/urn:nbn:de:bvb:29-opus4-126678 https://doi.org/10.3390/geosciences10010012 https://opus4.kobv.de/opus4-fau/files/12667/geosciences-10-00012.pdf https://creativecommons.org/licenses/by/4.0/deed.de info:eu-repo/semantics/openAccess CC-BY ddc:550 article doc-type:article 2019 ftuniverlangen https://doi.org/10.3390/geosciences10010012 2022-07-28T20:38:29Z Ice cliffs within a glacier represent a challenge for the continuity equations used in many glacier models by interrupting the validity of input parameters. In the case of Gourdon Glacier on James Ross Island, Antarctica, a ∼300–500 m high, almost vertical cliff, separates the outlet glacier from its main accumulation area on the plateau of the island. In 2017 and 2018 we conducted ice thickness measurements during two airborne ground penetrating radar campaigns in order to evaluate differences to older measurements from the 1990s. The observed differences are mostly smaller than the estimated error bars. In comparison to the in situ data, the published “consensus ice thickness estimate” strongly overestimates the ice thickness at the outlet. We analyse three different interpolation and ice thickness reconstruction methods. One approach additionally includes the mass input from the plateau. Differences between the interpolation methods have a minor impact on the ice discharge estimation if the used flux gates are in areas with a good coverage of in situ measurements. A much stronger influence was observed by uncertainties in the glacier velocities derived from remote sensing, especially in the direction of the velocity vector in proximity to the ice cliff. We conclude that the amount of in situ measurements should be increased for specific glacier types in order to detect biases in modeled ice thickness and ice discharge estimations. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica James Ross Island Ross Island OPUS FAU - Online publication system of Friedrich-Alexander-Universität Erlangen-Nürnberg Antarctic Antarctic Peninsula Gourdon ENVELOPE(-57.383,-57.383,-64.250,-64.250) Gourdon Glacier ENVELOPE(-57.400,-57.400,-64.233,-64.233) Ross Island Geosciences 10 1 12 |
institution |
Open Polar |
collection |
OPUS FAU - Online publication system of Friedrich-Alexander-Universität Erlangen-Nürnberg |
op_collection_id |
ftuniverlangen |
language |
English |
topic |
ddc:550 |
spellingShingle |
ddc:550 Lippl, Stefan Blindow, Norbert Fürst, Johannes J. Marinsek, Sebastián Seehaus, Thorsten C. Braun, Matthias H. Uncertainty Assessment of Ice Discharge Using GPR-Derived Ice Thickness from Gourdon Glacier, Antarctic Peninsula |
topic_facet |
ddc:550 |
description |
Ice cliffs within a glacier represent a challenge for the continuity equations used in many glacier models by interrupting the validity of input parameters. In the case of Gourdon Glacier on James Ross Island, Antarctica, a ∼300–500 m high, almost vertical cliff, separates the outlet glacier from its main accumulation area on the plateau of the island. In 2017 and 2018 we conducted ice thickness measurements during two airborne ground penetrating radar campaigns in order to evaluate differences to older measurements from the 1990s. The observed differences are mostly smaller than the estimated error bars. In comparison to the in situ data, the published “consensus ice thickness estimate” strongly overestimates the ice thickness at the outlet. We analyse three different interpolation and ice thickness reconstruction methods. One approach additionally includes the mass input from the plateau. Differences between the interpolation methods have a minor impact on the ice discharge estimation if the used flux gates are in areas with a good coverage of in situ measurements. A much stronger influence was observed by uncertainties in the glacier velocities derived from remote sensing, especially in the direction of the velocity vector in proximity to the ice cliff. We conclude that the amount of in situ measurements should be increased for specific glacier types in order to detect biases in modeled ice thickness and ice discharge estimations. |
format |
Article in Journal/Newspaper |
author |
Lippl, Stefan Blindow, Norbert Fürst, Johannes J. Marinsek, Sebastián Seehaus, Thorsten C. Braun, Matthias H. |
author_facet |
Lippl, Stefan Blindow, Norbert Fürst, Johannes J. Marinsek, Sebastián Seehaus, Thorsten C. Braun, Matthias H. |
author_sort |
Lippl, Stefan |
title |
Uncertainty Assessment of Ice Discharge Using GPR-Derived Ice Thickness from Gourdon Glacier, Antarctic Peninsula |
title_short |
Uncertainty Assessment of Ice Discharge Using GPR-Derived Ice Thickness from Gourdon Glacier, Antarctic Peninsula |
title_full |
Uncertainty Assessment of Ice Discharge Using GPR-Derived Ice Thickness from Gourdon Glacier, Antarctic Peninsula |
title_fullStr |
Uncertainty Assessment of Ice Discharge Using GPR-Derived Ice Thickness from Gourdon Glacier, Antarctic Peninsula |
title_full_unstemmed |
Uncertainty Assessment of Ice Discharge Using GPR-Derived Ice Thickness from Gourdon Glacier, Antarctic Peninsula |
title_sort |
uncertainty assessment of ice discharge using gpr-derived ice thickness from gourdon glacier, antarctic peninsula |
publishDate |
2019 |
url |
https://opus4.kobv.de/opus4-fau/frontdoor/index/index/docId/12667 https://nbn-resolving.org/urn:nbn:de:bvb:29-opus4-126678 https://doi.org/10.3390/geosciences10010012 https://opus4.kobv.de/opus4-fau/files/12667/geosciences-10-00012.pdf |
long_lat |
ENVELOPE(-57.383,-57.383,-64.250,-64.250) ENVELOPE(-57.400,-57.400,-64.233,-64.233) |
geographic |
Antarctic Antarctic Peninsula Gourdon Gourdon Glacier Ross Island |
geographic_facet |
Antarctic Antarctic Peninsula Gourdon Gourdon Glacier Ross Island |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica James Ross Island Ross Island |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica James Ross Island Ross Island |
op_relation |
https://opus4.kobv.de/opus4-fau/frontdoor/index/index/docId/12667 urn:nbn:de:bvb:29-opus4-126678 https://nbn-resolving.org/urn:nbn:de:bvb:29-opus4-126678 https://doi.org/10.3390/geosciences10010012 https://opus4.kobv.de/opus4-fau/files/12667/geosciences-10-00012.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/deed.de info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3390/geosciences10010012 |
container_title |
Geosciences |
container_volume |
10 |
container_issue |
1 |
container_start_page |
12 |
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1766113806188019712 |