Melting and fragmentation laws from the evolution of two large Southern Ocean icebergs estimated from satellite data
International audience The evolution of the thickness and area of two large Southern Ocean icebergs that have drifted in open water for more than a year is estimated through the combined analysis of altimeter data and visible satellite images. The observed thickness evolution is compared with iceber...
Published in: | The Cryosphere |
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Online Access: | https://hal-insu.archives-ouvertes.fr/insu-03683071 https://hal-insu.archives-ouvertes.fr/insu-03683071/document https://hal-insu.archives-ouvertes.fr/insu-03683071/file/tc-12-2267-2018.pdf https://doi.org/10.5194/tc-12-2267-2018 |
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ftunivnantes:oai:HAL:insu-03683071v1 2023-05-15T18:25:02+02:00 Melting and fragmentation laws from the evolution of two large Southern Ocean icebergs estimated from satellite data Bouhier, Nicolas Tournadre, Jean Rémy, Frédérique Gourves-Cousin, Rozenn Laboratoire d'Océanographie Physique et Spatiale (LOPS) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) 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)-Observatoire Midi-Pyrénées (OMP) 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) 2018 https://hal-insu.archives-ouvertes.fr/insu-03683071 https://hal-insu.archives-ouvertes.fr/insu-03683071/document https://hal-insu.archives-ouvertes.fr/insu-03683071/file/tc-12-2267-2018.pdf https://doi.org/10.5194/tc-12-2267-2018 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-12-2267-2018 insu-03683071 https://hal-insu.archives-ouvertes.fr/insu-03683071 https://hal-insu.archives-ouvertes.fr/insu-03683071/document https://hal-insu.archives-ouvertes.fr/insu-03683071/file/tc-12-2267-2018.pdf BIBCODE: 2018TCry.12.2267B doi:10.5194/tc-12-2267-2018 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess The Cryosphere https://hal-insu.archives-ouvertes.fr/insu-03683071 The Cryosphere, 2018, 12, pp.2267-2285. ⟨10.5194/tc-12-2267-2018⟩ [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2018 ftunivnantes https://doi.org/10.5194/tc-12-2267-2018 2023-02-22T01:54:56Z International audience The evolution of the thickness and area of two large Southern Ocean icebergs that have drifted in open water for more than a year is estimated through the combined analysis of altimeter data and visible satellite images. The observed thickness evolution is compared with iceberg melting predictions from two commonly used melting formulations, allowing us to test their validity for large icebergs. The first formulation, based on a fluid dynamics approach, tends to underestimate basal melt rates, while the second formulation, which considers the thermodynamic budget, appears more consistent with observations. Fragmentation is more important than melting for the decay of large icebergs. Despite its importance, fragmentation remains poorly documented. The correlation between the observed volume loss of our two icebergs and environmental parameters highlights factors most likely to promote fragmentation. Using this information, a bulk model of fragmentation is established that depends on ocean temperature and iceberg velocity. The model is effective at reproducing observed volume variations. The size distribution of the calved pieces is estimated using both altimeter data and visible images and is found to be consistent with previous results and typical of brittle fragmentation processes. These results are valuable in accounting for the freshwater flux constrained by large icebergs in models. Article in Journal/Newspaper Southern Ocean The Cryosphere Université de Nantes: HAL-UNIV-NANTES Southern Ocean The Cryosphere 12 7 2267 2285 |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
spellingShingle |
[SDU]Sciences of the Universe [physics] Bouhier, Nicolas Tournadre, Jean Rémy, Frédérique Gourves-Cousin, Rozenn Melting and fragmentation laws from the evolution of two large Southern Ocean icebergs estimated from satellite data |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
International audience The evolution of the thickness and area of two large Southern Ocean icebergs that have drifted in open water for more than a year is estimated through the combined analysis of altimeter data and visible satellite images. The observed thickness evolution is compared with iceberg melting predictions from two commonly used melting formulations, allowing us to test their validity for large icebergs. The first formulation, based on a fluid dynamics approach, tends to underestimate basal melt rates, while the second formulation, which considers the thermodynamic budget, appears more consistent with observations. Fragmentation is more important than melting for the decay of large icebergs. Despite its importance, fragmentation remains poorly documented. The correlation between the observed volume loss of our two icebergs and environmental parameters highlights factors most likely to promote fragmentation. Using this information, a bulk model of fragmentation is established that depends on ocean temperature and iceberg velocity. The model is effective at reproducing observed volume variations. The size distribution of the calved pieces is estimated using both altimeter data and visible images and is found to be consistent with previous results and typical of brittle fragmentation processes. These results are valuable in accounting for the freshwater flux constrained by large icebergs in models. |
author2 |
Laboratoire d'Océanographie Physique et Spatiale (LOPS) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) 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)-Observatoire Midi-Pyrénées (OMP) 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) |
format |
Article in Journal/Newspaper |
author |
Bouhier, Nicolas Tournadre, Jean Rémy, Frédérique Gourves-Cousin, Rozenn |
author_facet |
Bouhier, Nicolas Tournadre, Jean Rémy, Frédérique Gourves-Cousin, Rozenn |
author_sort |
Bouhier, Nicolas |
title |
Melting and fragmentation laws from the evolution of two large Southern Ocean icebergs estimated from satellite data |
title_short |
Melting and fragmentation laws from the evolution of two large Southern Ocean icebergs estimated from satellite data |
title_full |
Melting and fragmentation laws from the evolution of two large Southern Ocean icebergs estimated from satellite data |
title_fullStr |
Melting and fragmentation laws from the evolution of two large Southern Ocean icebergs estimated from satellite data |
title_full_unstemmed |
Melting and fragmentation laws from the evolution of two large Southern Ocean icebergs estimated from satellite data |
title_sort |
melting and fragmentation laws from the evolution of two large southern ocean icebergs estimated from satellite data |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://hal-insu.archives-ouvertes.fr/insu-03683071 https://hal-insu.archives-ouvertes.fr/insu-03683071/document https://hal-insu.archives-ouvertes.fr/insu-03683071/file/tc-12-2267-2018.pdf https://doi.org/10.5194/tc-12-2267-2018 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean The Cryosphere |
genre_facet |
Southern Ocean The Cryosphere |
op_source |
The Cryosphere https://hal-insu.archives-ouvertes.fr/insu-03683071 The Cryosphere, 2018, 12, pp.2267-2285. ⟨10.5194/tc-12-2267-2018⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-12-2267-2018 insu-03683071 https://hal-insu.archives-ouvertes.fr/insu-03683071 https://hal-insu.archives-ouvertes.fr/insu-03683071/document https://hal-insu.archives-ouvertes.fr/insu-03683071/file/tc-12-2267-2018.pdf BIBCODE: 2018TCry.12.2267B doi:10.5194/tc-12-2267-2018 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/tc-12-2267-2018 |
container_title |
The Cryosphere |
container_volume |
12 |
container_issue |
7 |
container_start_page |
2267 |
op_container_end_page |
2285 |
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1766206184940896256 |