Antarctic icebergs distributions, 2002-2010
International audience Interest for icebergs and their possible impact on southern ocean circulation and biology has increased during the recent years. While large tabular icebergs are routinely tracked and monitored using scatterometer data, the distribution of smaller icebergs (less than some km)...
Published in: | Journal of Geophysical Research: Oceans |
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Main Authors: | , , |
Other Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2012
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Subjects: | |
Online Access: | https://hal.science/hal-00747264 https://hal.science/hal-00747264/document https://hal.science/hal-00747264/file/2011JC007441.pdf https://doi.org/10.1029/2011JC007441 |
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Institut national des sciences de l'Univers: HAL-INSU |
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[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Tournadre, J. Girard-Ardhuin, F. Legrésy, Benoît Antarctic icebergs distributions, 2002-2010 |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience Interest for icebergs and their possible impact on southern ocean circulation and biology has increased during the recent years. While large tabular icebergs are routinely tracked and monitored using scatterometer data, the distribution of smaller icebergs (less than some km) is still largely unknown as they are difficult to detect operationally using conventional satellite data. In a recent study, Tournadre et al. (2008) showed that small icebergs can be detected, at least in open water, using high resolution (20 Hz) altimeter waveforms. In the present paper, we present an improvement of their method that allows, assuming a constant iceberg freeboard elevation and constant ice backscatter coefficient, to estimate the top-down iceberg surface area and therefore the distribution of the volume of ice on a monthly basis. The complete Jason-1 reprocessed (version C) archive covering the 2002-2010 period has been processed using this method. The small iceberg data base for the southern ocean gives an unprecedented description of the small iceberg (100 m-2800 m) distribution at unprecedented time and space resolutions. The iceberg size, which follows a lognormal distribution with an overall mean length of 630 m, has a strong seasonal cycle reflecting the melting of icebergs during the austral summer estimated at 1.5 m/day. The total volume of ice in the southern ocean has an annual mean value of about 400 Gt, i.e., about 35% of the mean yearly volume of large tabular icebergs estimated from the National Ice Center database of 1979-2003 iceberg tracks and a model of iceberg thermodynamics. They can thus play a significant role in the injection of meltwater in the ocean. The distribution of ice volume which has strong seasonal cycle presents a very high spatial and temporal variability which is much contrasted in the three ocean basins (South Atlantic, Indian and Pacific oceans). The analysis of the relationship between small and large (>5 km) icebergs shows that a majority of small icebergs ... |
author2 |
Laboratoire d'Océanographie Spatiale (LOS) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) GLACIO LEGOS 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) |
format |
Article in Journal/Newspaper |
author |
Tournadre, J. Girard-Ardhuin, F. Legrésy, Benoît |
author_facet |
Tournadre, J. Girard-Ardhuin, F. Legrésy, Benoît |
author_sort |
Tournadre, J. |
title |
Antarctic icebergs distributions, 2002-2010 |
title_short |
Antarctic icebergs distributions, 2002-2010 |
title_full |
Antarctic icebergs distributions, 2002-2010 |
title_fullStr |
Antarctic icebergs distributions, 2002-2010 |
title_full_unstemmed |
Antarctic icebergs distributions, 2002-2010 |
title_sort |
antarctic icebergs distributions, 2002-2010 |
publisher |
HAL CCSD |
publishDate |
2012 |
url |
https://hal.science/hal-00747264 https://hal.science/hal-00747264/document https://hal.science/hal-00747264/file/2011JC007441.pdf https://doi.org/10.1029/2011JC007441 |
geographic |
Antarctic Southern Ocean Austral Pacific Indian |
geographic_facet |
Antarctic Southern Ocean Austral Pacific Indian |
genre |
Antarc* Antarctic Iceberg* Southern Ocean |
genre_facet |
Antarc* Antarctic Iceberg* Southern Ocean |
op_source |
ISSN: 0148-0227 EISSN: 2156-2202 Journal of Geophysical Research https://hal.science/hal-00747264 Journal of Geophysical Research, 2012, 117, pp.1-15. ⟨10.1029/2011JC007441⟩ |
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info:eu-repo/semantics/altIdentifier/doi/10.1029/2011JC007441 hal-00747264 https://hal.science/hal-00747264 https://hal.science/hal-00747264/document https://hal.science/hal-00747264/file/2011JC007441.pdf doi:10.1029/2011JC007441 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2011JC007441 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
117 |
container_issue |
C5 |
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n/a |
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1785527419053015040 |
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ftinsu:oai:HAL:hal-00747264v1 2023-12-17T10:20:54+01:00 Antarctic icebergs distributions, 2002-2010 Tournadre, J. Girard-Ardhuin, F. Legrésy, Benoît Laboratoire d'Océanographie Spatiale (LOS) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) GLACIO LEGOS 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) 2012 https://hal.science/hal-00747264 https://hal.science/hal-00747264/document https://hal.science/hal-00747264/file/2011JC007441.pdf https://doi.org/10.1029/2011JC007441 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2011JC007441 hal-00747264 https://hal.science/hal-00747264 https://hal.science/hal-00747264/document https://hal.science/hal-00747264/file/2011JC007441.pdf doi:10.1029/2011JC007441 info:eu-repo/semantics/OpenAccess ISSN: 0148-0227 EISSN: 2156-2202 Journal of Geophysical Research https://hal.science/hal-00747264 Journal of Geophysical Research, 2012, 117, pp.1-15. ⟨10.1029/2011JC007441⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2012 ftinsu https://doi.org/10.1029/2011JC007441 2023-11-22T17:37:09Z International audience Interest for icebergs and their possible impact on southern ocean circulation and biology has increased during the recent years. While large tabular icebergs are routinely tracked and monitored using scatterometer data, the distribution of smaller icebergs (less than some km) is still largely unknown as they are difficult to detect operationally using conventional satellite data. In a recent study, Tournadre et al. (2008) showed that small icebergs can be detected, at least in open water, using high resolution (20 Hz) altimeter waveforms. In the present paper, we present an improvement of their method that allows, assuming a constant iceberg freeboard elevation and constant ice backscatter coefficient, to estimate the top-down iceberg surface area and therefore the distribution of the volume of ice on a monthly basis. The complete Jason-1 reprocessed (version C) archive covering the 2002-2010 period has been processed using this method. The small iceberg data base for the southern ocean gives an unprecedented description of the small iceberg (100 m-2800 m) distribution at unprecedented time and space resolutions. The iceberg size, which follows a lognormal distribution with an overall mean length of 630 m, has a strong seasonal cycle reflecting the melting of icebergs during the austral summer estimated at 1.5 m/day. The total volume of ice in the southern ocean has an annual mean value of about 400 Gt, i.e., about 35% of the mean yearly volume of large tabular icebergs estimated from the National Ice Center database of 1979-2003 iceberg tracks and a model of iceberg thermodynamics. They can thus play a significant role in the injection of meltwater in the ocean. The distribution of ice volume which has strong seasonal cycle presents a very high spatial and temporal variability which is much contrasted in the three ocean basins (South Atlantic, Indian and Pacific oceans). The analysis of the relationship between small and large (>5 km) icebergs shows that a majority of small icebergs ... Article in Journal/Newspaper Antarc* Antarctic Iceberg* Southern Ocean Institut national des sciences de l'Univers: HAL-INSU Antarctic Southern Ocean Austral Pacific Indian Journal of Geophysical Research: Oceans 117 C5 n/a n/a |