On producing sea ice deformation data sets from SAR-derived sea ice motion
International audience We propose a method to reduce the error generated when computing sea ice deformation fields from synthetic aperture radar (SAR)-derived sea ice motion. The method is based on two steps. The first step consists of using a triangulation of the positions taken from the sea ice tr...
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ftunigrenoble:oai:HAL:hal-03405145v1 2024-05-12T08:10:43+00:00 On producing sea ice deformation data sets from SAR-derived sea ice motion Bouillon, S Rampal, Pierre Nansen Environmental and Remote Sensing Center Bergen (NERSC) 2015 https://hal.univ-grenoble-alpes.fr/hal-03405145 https://hal.univ-grenoble-alpes.fr/hal-03405145/document https://hal.univ-grenoble-alpes.fr/hal-03405145/file/Bouillon2015The_Cryosphere.pdf https://doi.org/10.5194/tc-9-663-2015 en eng HAL CCSD Copernicus info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-9-663-2015 hal-03405145 https://hal.univ-grenoble-alpes.fr/hal-03405145 https://hal.univ-grenoble-alpes.fr/hal-03405145/document https://hal.univ-grenoble-alpes.fr/hal-03405145/file/Bouillon2015The_Cryosphere.pdf doi:10.5194/tc-9-663-2015 info:eu-repo/semantics/OpenAccess ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://hal.univ-grenoble-alpes.fr/hal-03405145 The Cryosphere, 2015, 9 (2), pp.663 - 673. ⟨10.5194/tc-9-663-2015⟩ [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2015 ftunigrenoble https://doi.org/10.5194/tc-9-663-2015 2024-04-18T03:13:27Z International audience We propose a method to reduce the error generated when computing sea ice deformation fields from synthetic aperture radar (SAR)-derived sea ice motion. The method is based on two steps. The first step consists of using a triangulation of the positions taken from the sea ice trajectories to define a mesh on which a first estimate of sea ice deformation is computed. The second step consists of applying a specific smoother to the deformation field to reduce the artificial noise that arises along discontinuities in the sea ice motion field. This method is here applied to RADARSAT Geophysical Processor System (RGPS) sea ice trajectories having a temporal and spatial resolution of about 3 days and 10 km, respectively. From the comparison between unfiltered and filtered fields, we estimate that the artificial noise causes an overestimation of about 60 % of opening and closing. The artificial noise also has a strong impact on the statistical distribution of the deformation and on the scaling exponents estimated with multifractal analysis. We also show that a similar noise is present in the deformation fields provided in the widely used four-point deformation RGPS data set. These findings may have serious implications for previous studies as the constant overestimation of the opening and closing could lead to a large overestimation of freezing in leads, salt rejection and sea ice ridging. Article in Journal/Newspaper Sea ice The Cryosphere Université Grenoble Alpes: HAL The Cryosphere 9 2 663 673 |
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Open Polar |
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Université Grenoble Alpes: HAL |
op_collection_id |
ftunigrenoble |
language |
English |
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[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
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[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Bouillon, S Rampal, Pierre On producing sea ice deformation data sets from SAR-derived sea ice motion |
topic_facet |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience We propose a method to reduce the error generated when computing sea ice deformation fields from synthetic aperture radar (SAR)-derived sea ice motion. The method is based on two steps. The first step consists of using a triangulation of the positions taken from the sea ice trajectories to define a mesh on which a first estimate of sea ice deformation is computed. The second step consists of applying a specific smoother to the deformation field to reduce the artificial noise that arises along discontinuities in the sea ice motion field. This method is here applied to RADARSAT Geophysical Processor System (RGPS) sea ice trajectories having a temporal and spatial resolution of about 3 days and 10 km, respectively. From the comparison between unfiltered and filtered fields, we estimate that the artificial noise causes an overestimation of about 60 % of opening and closing. The artificial noise also has a strong impact on the statistical distribution of the deformation and on the scaling exponents estimated with multifractal analysis. We also show that a similar noise is present in the deformation fields provided in the widely used four-point deformation RGPS data set. These findings may have serious implications for previous studies as the constant overestimation of the opening and closing could lead to a large overestimation of freezing in leads, salt rejection and sea ice ridging. |
author2 |
Nansen Environmental and Remote Sensing Center Bergen (NERSC) |
format |
Article in Journal/Newspaper |
author |
Bouillon, S Rampal, Pierre |
author_facet |
Bouillon, S Rampal, Pierre |
author_sort |
Bouillon, S |
title |
On producing sea ice deformation data sets from SAR-derived sea ice motion |
title_short |
On producing sea ice deformation data sets from SAR-derived sea ice motion |
title_full |
On producing sea ice deformation data sets from SAR-derived sea ice motion |
title_fullStr |
On producing sea ice deformation data sets from SAR-derived sea ice motion |
title_full_unstemmed |
On producing sea ice deformation data sets from SAR-derived sea ice motion |
title_sort |
on producing sea ice deformation data sets from sar-derived sea ice motion |
publisher |
HAL CCSD |
publishDate |
2015 |
url |
https://hal.univ-grenoble-alpes.fr/hal-03405145 https://hal.univ-grenoble-alpes.fr/hal-03405145/document https://hal.univ-grenoble-alpes.fr/hal-03405145/file/Bouillon2015The_Cryosphere.pdf https://doi.org/10.5194/tc-9-663-2015 |
genre |
Sea ice The Cryosphere |
genre_facet |
Sea ice The Cryosphere |
op_source |
ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://hal.univ-grenoble-alpes.fr/hal-03405145 The Cryosphere, 2015, 9 (2), pp.663 - 673. ⟨10.5194/tc-9-663-2015⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-9-663-2015 hal-03405145 https://hal.univ-grenoble-alpes.fr/hal-03405145 https://hal.univ-grenoble-alpes.fr/hal-03405145/document https://hal.univ-grenoble-alpes.fr/hal-03405145/file/Bouillon2015The_Cryosphere.pdf doi:10.5194/tc-9-663-2015 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/tc-9-663-2015 |
container_title |
The Cryosphere |
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9 |
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2 |
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663 |
op_container_end_page |
673 |
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