Deriving ice thickness, glacier volume and bedrock morphology of Austre Lovénbreen (Svalbard) using GPR
ABSTRACT Austre Lovénbreen is a 4.6 km 2 glacier on the Archipelago of Svalbard (79° N) that has been surveyed over the last 47 years in order to monitor in particular the glacier evolution and associated hydrological phenomena in the context of nowadays global warming. A three‐week field survey dur...
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crwiley:10.3997/1873-0604.2012040 2024-09-09T19:41:37+00:00 Deriving ice thickness, glacier volume and bedrock morphology of Austre Lovénbreen (Svalbard) using GPR Saintenoy, A. Friedt, J.‐M. Booth, A. D. Tolle, F. Bernard, E. Laffly, D. Marlin, C. Griselin, M. 2012 http://dx.doi.org/10.3997/1873-0604.2012040 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.3997%2F1873-0604.2012040 https://onlinelibrary.wiley.com/doi/pdf/10.3997/1873-0604.2012040 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Near Surface Geophysics volume 11, issue 2, page 253-262 ISSN 1569-4445 1873-0604 journal-article 2012 crwiley https://doi.org/10.3997/1873-0604.2012040 2024-06-20T04:24:31Z ABSTRACT Austre Lovénbreen is a 4.6 km 2 glacier on the Archipelago of Svalbard (79° N) that has been surveyed over the last 47 years in order to monitor in particular the glacier evolution and associated hydrological phenomena in the context of nowadays global warming. A three‐week field survey during April 2010 allowed for the acquisition of a dense mesh of ground‐penetrating radar (GPR) data with an average of 14 683 points per km 2 (67 542 points total) on the glacier surface. The profiles were acquired using Mala equipment with 100 MHz antennas, towed slowly enough to record on average every 0.3 m, a trace long enough to sound down to 189 m of ice. One profile was repeated with a 50 MHz antenna set to improve electromagnetic wave propagation depth in scattering media observed in the cirques closest to the slopes. The GPR was coupled to a GPS system to position traces. Each profile was manually edited using standard GPR data processing including migration, to pick the reflection arrival time from the ice‐bedrock interface. Snow cover was evaluated through 42 snow drilling measurements regularly spaced to cover the entire glacier. These data were acquired at the time of the GPR survey and subsequently spatially interpolated using ordinary kriging. Using a snow velocity of 0.22 m/ns, the snow thickness was converted to electromagnetic wave traveltimes and subtracted from the picked traveltimes to the ice‐bedrock interface. The resulting traveltimes were converted to ice thickness using a velocity of 0.17 m/ns. The velocity uncertainty is discussed from a common midpoint profile analysis. A total of 67 542 geo‐referenced data points with GPR‐derived ice thicknesses, in addition to a glacier boundary line derived from satellite images taken during summer, were interpolated over the entire glacier surface using kriging with a 10 m grid size. Some uncertainty analyses were carried out and we calculated an averaged ice thickness of 76 m and a maximum depth of 164 m with a relative error of 11.9%. The volume of the ... Article in Journal/Newspaper glacier Svalbard Wiley Online Library Svalbard Near Surface Geophysics 11 2 253 262 |
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Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
ABSTRACT Austre Lovénbreen is a 4.6 km 2 glacier on the Archipelago of Svalbard (79° N) that has been surveyed over the last 47 years in order to monitor in particular the glacier evolution and associated hydrological phenomena in the context of nowadays global warming. A three‐week field survey during April 2010 allowed for the acquisition of a dense mesh of ground‐penetrating radar (GPR) data with an average of 14 683 points per km 2 (67 542 points total) on the glacier surface. The profiles were acquired using Mala equipment with 100 MHz antennas, towed slowly enough to record on average every 0.3 m, a trace long enough to sound down to 189 m of ice. One profile was repeated with a 50 MHz antenna set to improve electromagnetic wave propagation depth in scattering media observed in the cirques closest to the slopes. The GPR was coupled to a GPS system to position traces. Each profile was manually edited using standard GPR data processing including migration, to pick the reflection arrival time from the ice‐bedrock interface. Snow cover was evaluated through 42 snow drilling measurements regularly spaced to cover the entire glacier. These data were acquired at the time of the GPR survey and subsequently spatially interpolated using ordinary kriging. Using a snow velocity of 0.22 m/ns, the snow thickness was converted to electromagnetic wave traveltimes and subtracted from the picked traveltimes to the ice‐bedrock interface. The resulting traveltimes were converted to ice thickness using a velocity of 0.17 m/ns. The velocity uncertainty is discussed from a common midpoint profile analysis. A total of 67 542 geo‐referenced data points with GPR‐derived ice thicknesses, in addition to a glacier boundary line derived from satellite images taken during summer, were interpolated over the entire glacier surface using kriging with a 10 m grid size. Some uncertainty analyses were carried out and we calculated an averaged ice thickness of 76 m and a maximum depth of 164 m with a relative error of 11.9%. The volume of the ... |
format |
Article in Journal/Newspaper |
author |
Saintenoy, A. Friedt, J.‐M. Booth, A. D. Tolle, F. Bernard, E. Laffly, D. Marlin, C. Griselin, M. |
spellingShingle |
Saintenoy, A. Friedt, J.‐M. Booth, A. D. Tolle, F. Bernard, E. Laffly, D. Marlin, C. Griselin, M. Deriving ice thickness, glacier volume and bedrock morphology of Austre Lovénbreen (Svalbard) using GPR |
author_facet |
Saintenoy, A. Friedt, J.‐M. Booth, A. D. Tolle, F. Bernard, E. Laffly, D. Marlin, C. Griselin, M. |
author_sort |
Saintenoy, A. |
title |
Deriving ice thickness, glacier volume and bedrock morphology of Austre Lovénbreen (Svalbard) using GPR |
title_short |
Deriving ice thickness, glacier volume and bedrock morphology of Austre Lovénbreen (Svalbard) using GPR |
title_full |
Deriving ice thickness, glacier volume and bedrock morphology of Austre Lovénbreen (Svalbard) using GPR |
title_fullStr |
Deriving ice thickness, glacier volume and bedrock morphology of Austre Lovénbreen (Svalbard) using GPR |
title_full_unstemmed |
Deriving ice thickness, glacier volume and bedrock morphology of Austre Lovénbreen (Svalbard) using GPR |
title_sort |
deriving ice thickness, glacier volume and bedrock morphology of austre lovénbreen (svalbard) using gpr |
publisher |
Wiley |
publishDate |
2012 |
url |
http://dx.doi.org/10.3997/1873-0604.2012040 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.3997%2F1873-0604.2012040 https://onlinelibrary.wiley.com/doi/pdf/10.3997/1873-0604.2012040 |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
glacier Svalbard |
genre_facet |
glacier Svalbard |
op_source |
Near Surface Geophysics volume 11, issue 2, page 253-262 ISSN 1569-4445 1873-0604 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.3997/1873-0604.2012040 |
container_title |
Near Surface Geophysics |
container_volume |
11 |
container_issue |
2 |
container_start_page |
253 |
op_container_end_page |
262 |
_version_ |
1809910964361887744 |