Melting and fragmentation laws from the evolution of two large Southern Ocean icebergs estimated from satellite data
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 f...
Published in: | The Cryosphere |
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Language: | English |
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Copernicus Publications
2018
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Online Access: | https://doi.org/10.5194/tc-12-2267-2018 https://www.the-cryosphere.net/12/2267/2018/tc-12-2267-2018.pdf https://doaj.org/article/fcb1a637c83c4f1c8f658eb516d9df8f |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:fcb1a637c83c4f1c8f658eb516d9df8f 2023-05-15T18:25:02+02:00 Melting and fragmentation laws from the evolution of two large Southern Ocean icebergs estimated from satellite data N. Bouhier J. Tournadre F. Rémy R. Gourves-Cousin 2018-07-01 https://doi.org/10.5194/tc-12-2267-2018 https://www.the-cryosphere.net/12/2267/2018/tc-12-2267-2018.pdf https://doaj.org/article/fcb1a637c83c4f1c8f658eb516d9df8f en eng Copernicus Publications doi:10.5194/tc-12-2267-2018 1994-0416 1994-0424 https://www.the-cryosphere.net/12/2267/2018/tc-12-2267-2018.pdf https://doaj.org/article/fcb1a637c83c4f1c8f658eb516d9df8f undefined The Cryosphere, Vol 12, Pp 2267-2285 (2018) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2018 fttriple https://doi.org/10.5194/tc-12-2267-2018 2023-01-22T19:24:45Z 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 Unknown Southern Ocean The Cryosphere 12 7 2267 2285 |
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Open Polar |
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op_collection_id |
fttriple |
language |
English |
topic |
geo envir |
spellingShingle |
geo envir N. Bouhier J. Tournadre F. Rémy R. Gourves-Cousin Melting and fragmentation laws from the evolution of two large Southern Ocean icebergs estimated from satellite data |
topic_facet |
geo envir |
description |
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. |
format |
Article in Journal/Newspaper |
author |
N. Bouhier J. Tournadre F. Rémy R. Gourves-Cousin |
author_facet |
N. Bouhier J. Tournadre F. Rémy R. Gourves-Cousin |
author_sort |
N. Bouhier |
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 |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/tc-12-2267-2018 https://www.the-cryosphere.net/12/2267/2018/tc-12-2267-2018.pdf https://doaj.org/article/fcb1a637c83c4f1c8f658eb516d9df8f |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean The Cryosphere |
genre_facet |
Southern Ocean The Cryosphere |
op_source |
The Cryosphere, Vol 12, Pp 2267-2285 (2018) |
op_relation |
doi:10.5194/tc-12-2267-2018 1994-0416 1994-0424 https://www.the-cryosphere.net/12/2267/2018/tc-12-2267-2018.pdf https://doaj.org/article/fcb1a637c83c4f1c8f658eb516d9df8f |
op_rights |
undefined |
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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1766206189117374464 |