Sources of backscatter at 5.3GHz from a superimposed ice and firn area revealed by multi-frequency GPR and cores
We investigate the major sources of backscatter at 5.3 GHz, within the superimposed ice and firn areas of a polythermal glacier. Two ground-penetrating radar systems, an 800 MHz impulse system and a polarimetric 5.3 GHz frequency-modulated continuous-wave system, are used to acquire along-glacier pr...
Published in: | Journal of Glaciology |
---|---|
Main Authors: | , , , |
Other Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2009
|
Subjects: | |
Online Access: | https://hal.science/hal-00401224 https://hal.science/hal-00401224/document https://hal.science/hal-00401224/file/Langley_JOG_2009.pdf https://doi.org/10.3189/002214309788608660 |
id |
ftmeteofrance:oai:HAL:hal-00401224v1 |
---|---|
record_format |
openpolar |
spelling |
ftmeteofrance:oai:HAL:hal-00401224v1 2024-09-15T18:07:57+00:00 Sources of backscatter at 5.3GHz from a superimposed ice and firn area revealed by multi-frequency GPR and cores Langley, K. Lacroix, Pierre Hamran, S.E. Brandt, O. University of Oslo (UiO) Océan du Large et Variabilité Climatique (OLVAC) Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) Norwegian Polar Institute 2009 https://hal.science/hal-00401224 https://hal.science/hal-00401224/document https://hal.science/hal-00401224/file/Langley_JOG_2009.pdf https://doi.org/10.3189/002214309788608660 en eng HAL CCSD International Glaciological Society info:eu-repo/semantics/altIdentifier/doi/10.3189/002214309788608660 hal-00401224 https://hal.science/hal-00401224 https://hal.science/hal-00401224/document https://hal.science/hal-00401224/file/Langley_JOG_2009.pdf doi:10.3189/002214309788608660 info:eu-repo/semantics/OpenAccess ISSN: 0022-1430 EISSN: 1727-5652 Journal of Glaciology https://hal.science/hal-00401224 Journal of Glaciology, 2009, 55 (190), pp.373-383. ⟨10.3189/002214309788608660⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2009 ftmeteofrance https://doi.org/10.3189/002214309788608660 2024-06-25T00:07:45Z We investigate the major sources of backscatter at 5.3 GHz, within the superimposed ice and firn areas of a polythermal glacier. Two ground-penetrating radar systems, an 800 MHz impulse system and a polarimetric 5.3 GHz frequency-modulated continuous-wave system, are used to acquire along-glacier profiles in the accumulation area of Kongsvegen, Svalbard. The 800 MHz response is used to map reflection horizons in the glacier. Using cores from the superimposed ice and firn areas, the causes of these reflection horizons, in terms of snow, firn and ice layers, are investigated. Superimposing the reflection horizons on the co-polarized and cross-polarized 5.3 GHz profile, we are able to determine how the 5.3 GHz frequency responds to the different media. Scattering at rough interfaces and volume scattering occur in the superimposed ice area and are apparently caused by air-bubble number, size and distribution. In the firn the strongest return originates from below the previous summer surface, consistent with previous findings. At approximately the same depth, strong incoherent scattering begins. The rapid decrease in coherent reflections indicates the significance of scattering in the firn. Article in Journal/Newspaper glacier Journal of Glaciology Svalbard Météo-France: HAL Journal of Glaciology 55 190 373 383 |
institution |
Open Polar |
collection |
Météo-France: HAL |
op_collection_id |
ftmeteofrance |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Langley, K. Lacroix, Pierre Hamran, S.E. Brandt, O. Sources of backscatter at 5.3GHz from a superimposed ice and firn area revealed by multi-frequency GPR and cores |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
We investigate the major sources of backscatter at 5.3 GHz, within the superimposed ice and firn areas of a polythermal glacier. Two ground-penetrating radar systems, an 800 MHz impulse system and a polarimetric 5.3 GHz frequency-modulated continuous-wave system, are used to acquire along-glacier profiles in the accumulation area of Kongsvegen, Svalbard. The 800 MHz response is used to map reflection horizons in the glacier. Using cores from the superimposed ice and firn areas, the causes of these reflection horizons, in terms of snow, firn and ice layers, are investigated. Superimposing the reflection horizons on the co-polarized and cross-polarized 5.3 GHz profile, we are able to determine how the 5.3 GHz frequency responds to the different media. Scattering at rough interfaces and volume scattering occur in the superimposed ice area and are apparently caused by air-bubble number, size and distribution. In the firn the strongest return originates from below the previous summer surface, consistent with previous findings. At approximately the same depth, strong incoherent scattering begins. The rapid decrease in coherent reflections indicates the significance of scattering in the firn. |
author2 |
University of Oslo (UiO) Océan du Large et Variabilité Climatique (OLVAC) Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) Norwegian Polar Institute |
format |
Article in Journal/Newspaper |
author |
Langley, K. Lacroix, Pierre Hamran, S.E. Brandt, O. |
author_facet |
Langley, K. Lacroix, Pierre Hamran, S.E. Brandt, O. |
author_sort |
Langley, K. |
title |
Sources of backscatter at 5.3GHz from a superimposed ice and firn area revealed by multi-frequency GPR and cores |
title_short |
Sources of backscatter at 5.3GHz from a superimposed ice and firn area revealed by multi-frequency GPR and cores |
title_full |
Sources of backscatter at 5.3GHz from a superimposed ice and firn area revealed by multi-frequency GPR and cores |
title_fullStr |
Sources of backscatter at 5.3GHz from a superimposed ice and firn area revealed by multi-frequency GPR and cores |
title_full_unstemmed |
Sources of backscatter at 5.3GHz from a superimposed ice and firn area revealed by multi-frequency GPR and cores |
title_sort |
sources of backscatter at 5.3ghz from a superimposed ice and firn area revealed by multi-frequency gpr and cores |
publisher |
HAL CCSD |
publishDate |
2009 |
url |
https://hal.science/hal-00401224 https://hal.science/hal-00401224/document https://hal.science/hal-00401224/file/Langley_JOG_2009.pdf https://doi.org/10.3189/002214309788608660 |
genre |
glacier Journal of Glaciology Svalbard |
genre_facet |
glacier Journal of Glaciology Svalbard |
op_source |
ISSN: 0022-1430 EISSN: 1727-5652 Journal of Glaciology https://hal.science/hal-00401224 Journal of Glaciology, 2009, 55 (190), pp.373-383. ⟨10.3189/002214309788608660⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.3189/002214309788608660 hal-00401224 https://hal.science/hal-00401224 https://hal.science/hal-00401224/document https://hal.science/hal-00401224/file/Langley_JOG_2009.pdf doi:10.3189/002214309788608660 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.3189/002214309788608660 |
container_title |
Journal of Glaciology |
container_volume |
55 |
container_issue |
190 |
container_start_page |
373 |
op_container_end_page |
383 |
_version_ |
1810445308593700864 |