In situ measurements of snow surface roughness using a laser profiler
International audience The snow surface roughness at centimetre and millimetre scales is an important parameter related to wind transport, snowdrifts, snowfall, snowmelt and snow grain size. Knowledge of the snow surface roughness is also of high interest for analyzing the signal from radar sensors...
Published in: | Journal of Glaciology |
---|---|
Main Authors: | , , , , , , , |
Other Authors: | , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2008
|
Subjects: | |
Online Access: | https://hal.science/hal-00363932 https://hal.science/hal-00363932/document https://hal.science/hal-00363932/file/in-situ-measurements-of-snow-surface-roughness-using-a-laser-profiler.pdf https://doi.org/10.3189/002214308786570863 |
id |
ftunivnantes:oai:HAL:hal-00363932v1 |
---|---|
record_format |
openpolar |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
spellingShingle |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology Lacroix, Pascal Legrésy, Benoit Langley, K. Hamran, S.E. Kohler, J. Roques, S. Rémy, Frédérique Dechambre, Monique In situ measurements of snow surface roughness using a laser profiler |
topic_facet |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
description |
International audience The snow surface roughness at centimetre and millimetre scales is an important parameter related to wind transport, snowdrifts, snowfall, snowmelt and snow grain size. Knowledge of the snow surface roughness is also of high interest for analyzing the signal from radar sensors such as SAR, altimeters and scatterometers. Unfortunately, this parameter has seldom been measured over snow surfaces. The techniques used to measure the roughness of other surfaces, such as agricultural or sand soils, are difficult to implement in polar regions because of the harsh climatic conditions. In this paper we develop a device based on a laser profiler coupled with a GPS receiver on board a snowmobile. This instrumentation was tested successfully in midre Lovénbreen, Svalbard, in April 2006. It allowed us to generate profiles of 3 km sections of the snow-covered glacier surface. Because of the motion of the snowmobile, the roughness signal is mixed with the snowmobile signal. We use a distance/frequency analysis (the empirical mode decomposition) to filter the signal. This method allows us to recover the snow surface structures of wavelengths between 4 and 50 cm with amplitudes of >1 mm. Finally, the roughness parameters of snow surfaces are retrieved. The snow surface roughness is found to be dependent on the scales of the observations. The retrieved RMS of the height distribution is found to vary between 0.5 and 9.2 mm, and the correlation length is found to be between 0.6 and 46 cm. This range of measurements is particularly well adapted to the analysis of GHz radar response on snow surfaces. |
author2 |
Services communs OMP (UMS 831) Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-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)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS) Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) University of Oslo (UiO) Norwegian Polar Institute Laboratoire Astrophysique de Toulouse-Tarbes (LATT) Centre d'étude des environnements terrestre et planétaires (CETP) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Lacroix, Pascal Legrésy, Benoit Langley, K. Hamran, S.E. Kohler, J. Roques, S. Rémy, Frédérique Dechambre, Monique |
author_facet |
Lacroix, Pascal Legrésy, Benoit Langley, K. Hamran, S.E. Kohler, J. Roques, S. Rémy, Frédérique Dechambre, Monique |
author_sort |
Lacroix, Pascal |
title |
In situ measurements of snow surface roughness using a laser profiler |
title_short |
In situ measurements of snow surface roughness using a laser profiler |
title_full |
In situ measurements of snow surface roughness using a laser profiler |
title_fullStr |
In situ measurements of snow surface roughness using a laser profiler |
title_full_unstemmed |
In situ measurements of snow surface roughness using a laser profiler |
title_sort |
in situ measurements of snow surface roughness using a laser profiler |
publisher |
HAL CCSD |
publishDate |
2008 |
url |
https://hal.science/hal-00363932 https://hal.science/hal-00363932/document https://hal.science/hal-00363932/file/in-situ-measurements-of-snow-surface-roughness-using-a-laser-profiler.pdf https://doi.org/10.3189/002214308786570863 |
geographic |
Svalbard |
geographic_facet |
Svalbard |
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-00363932 Journal of Glaciology, 2008, 54 (187), pp.753-762. ⟨10.3189/002214308786570863⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.3189/002214308786570863 hal-00363932 https://hal.science/hal-00363932 https://hal.science/hal-00363932/document https://hal.science/hal-00363932/file/in-situ-measurements-of-snow-surface-roughness-using-a-laser-profiler.pdf doi:10.3189/002214308786570863 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.3189/002214308786570863 |
container_title |
Journal of Glaciology |
container_volume |
54 |
container_issue |
187 |
container_start_page |
753 |
op_container_end_page |
762 |
_version_ |
1766010257240227840 |
spelling |
ftunivnantes:oai:HAL:hal-00363932v1 2023-05-15T16:22:18+02:00 In situ measurements of snow surface roughness using a laser profiler Lacroix, Pascal Legrésy, Benoit Langley, K. Hamran, S.E. Kohler, J. Roques, S. Rémy, Frédérique Dechambre, Monique Services communs OMP (UMS 831) Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-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)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS) Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) University of Oslo (UiO) Norwegian Polar Institute Laboratoire Astrophysique de Toulouse-Tarbes (LATT) Centre d'étude des environnements terrestre et planétaires (CETP) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) 2008 https://hal.science/hal-00363932 https://hal.science/hal-00363932/document https://hal.science/hal-00363932/file/in-situ-measurements-of-snow-surface-roughness-using-a-laser-profiler.pdf https://doi.org/10.3189/002214308786570863 en eng HAL CCSD International Glaciological Society info:eu-repo/semantics/altIdentifier/doi/10.3189/002214308786570863 hal-00363932 https://hal.science/hal-00363932 https://hal.science/hal-00363932/document https://hal.science/hal-00363932/file/in-situ-measurements-of-snow-surface-roughness-using-a-laser-profiler.pdf doi:10.3189/002214308786570863 info:eu-repo/semantics/OpenAccess ISSN: 0022-1430 EISSN: 1727-5652 Journal of Glaciology https://hal.science/hal-00363932 Journal of Glaciology, 2008, 54 (187), pp.753-762. ⟨10.3189/002214308786570863⟩ [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology info:eu-repo/semantics/article Journal articles 2008 ftunivnantes https://doi.org/10.3189/002214308786570863 2023-02-22T02:27:50Z International audience The snow surface roughness at centimetre and millimetre scales is an important parameter related to wind transport, snowdrifts, snowfall, snowmelt and snow grain size. Knowledge of the snow surface roughness is also of high interest for analyzing the signal from radar sensors such as SAR, altimeters and scatterometers. Unfortunately, this parameter has seldom been measured over snow surfaces. The techniques used to measure the roughness of other surfaces, such as agricultural or sand soils, are difficult to implement in polar regions because of the harsh climatic conditions. In this paper we develop a device based on a laser profiler coupled with a GPS receiver on board a snowmobile. This instrumentation was tested successfully in midre Lovénbreen, Svalbard, in April 2006. It allowed us to generate profiles of 3 km sections of the snow-covered glacier surface. Because of the motion of the snowmobile, the roughness signal is mixed with the snowmobile signal. We use a distance/frequency analysis (the empirical mode decomposition) to filter the signal. This method allows us to recover the snow surface structures of wavelengths between 4 and 50 cm with amplitudes of >1 mm. Finally, the roughness parameters of snow surfaces are retrieved. The snow surface roughness is found to be dependent on the scales of the observations. The retrieved RMS of the height distribution is found to vary between 0.5 and 9.2 mm, and the correlation length is found to be between 0.6 and 46 cm. This range of measurements is particularly well adapted to the analysis of GHz radar response on snow surfaces. Article in Journal/Newspaper glacier Journal of Glaciology Svalbard Université de Nantes: HAL-UNIV-NANTES Svalbard Journal of Glaciology 54 187 753 762 |