Iceberg detection in open water by altimeter waveform analysis.
International audience Small icebergs (edge lengths <1 km) are difficult to detect and track. In a recently published study, it was demonstrated that small targets (ships, islets,.) emerging from the sea can be detected by the analysis of high-rate altimeter waveforms. The analysis of Jason altim...
Published in: | Journal of Geophysical Research |
---|---|
Main Authors: | , , |
Other Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2008
|
Subjects: | |
Online Access: | https://hal.science/hal-00406208 https://doi.org/10.1029/2007JC004587 |
id |
ftunivnantes:oai:HAL:hal-00406208v1 |
---|---|
record_format |
openpolar |
spelling |
ftunivnantes:oai:HAL:hal-00406208v1 2023-05-15T13:59:29+02:00 Iceberg detection in open water by altimeter waveform analysis. Tournadre, Jean Whitmer, Kirk Girard-Ardhuin, Fanny Laboratoire d'Océanographie Spatiale (LOS) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) Laboratoire de physique des océans (LPO) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) 2008 https://hal.science/hal-00406208 https://doi.org/10.1029/2007JC004587 en eng HAL CCSD Wiley-Blackwell info:eu-repo/semantics/altIdentifier/doi/10.1029/2007JC004587 hal-00406208 https://hal.science/hal-00406208 doi:10.1029/2007JC004587 ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.science/hal-00406208 Journal of Geophysical Research. Oceans, 2008, 113, pp.C08040. ⟨10.1029/2007JC004587⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2008 ftunivnantes https://doi.org/10.1029/2007JC004587 2023-02-08T01:23:34Z International audience Small icebergs (edge lengths <1 km) are difficult to detect and track. In a recently published study, it was demonstrated that small targets (ships, islets,.) emerging from the sea can be detected by the analysis of high-rate altimeter waveforms. The analysis of Jason altimeter data revealed that small icebergs also have a detectable signature in the thermal noise part of the altimeter waveforms for open water. These signatures are very similar to that of transponders and are almost deterministic. An automated method based on the detection of parabolic shapes in the thermal part of the waveforms by analysis of the convolution product with a filter has been developed and applied to 1 year of Jason high-rate waveform data. In addition, the minimum height and backscatter of the iceberg can also be estimated by this method. More than 8000 icebergs were identified between December 2004 and November 2005 in the open water around Antarctica. The annual distribution of icebergs presents a well-defined tripole structure, with maxima near the Antarctic Peninsula, the West Ice Shelf, and the Ross Sea. This distribution is in good agreement with the main trends in Antarctic iceberg motion presented in the scientific literature. The high concentration of icebergs propagating from the Antarctic Peninsula seems to confirm the importance of this region in the discharge of Antarctic ice into the ocean. The results clearly show that altimeter data are a powerful tool in the study of the distribution of small icebergs largely inaccessible by other satellite means. The principle of detection of icebergs by altimeter is quite simple and could be easily applied to the existing archive of all the past and present altimeters (ERS, Topex/Poseidon, Jason, and Envisat) to create a database covering more than 13 years that could improve our knowledge of climate change in Antarctica. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Ice Shelf Iceberg* Ross Sea West Ice Shelf Université de Nantes: HAL-UNIV-NANTES Antarctic Antarctic Peninsula Ross Sea The Antarctic West Ice Shelf ENVELOPE(85.000,85.000,-67.000,-67.000) Journal of Geophysical Research 113 C8 |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Tournadre, Jean Whitmer, Kirk Girard-Ardhuin, Fanny Iceberg detection in open water by altimeter waveform analysis. |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience Small icebergs (edge lengths <1 km) are difficult to detect and track. In a recently published study, it was demonstrated that small targets (ships, islets,.) emerging from the sea can be detected by the analysis of high-rate altimeter waveforms. The analysis of Jason altimeter data revealed that small icebergs also have a detectable signature in the thermal noise part of the altimeter waveforms for open water. These signatures are very similar to that of transponders and are almost deterministic. An automated method based on the detection of parabolic shapes in the thermal part of the waveforms by analysis of the convolution product with a filter has been developed and applied to 1 year of Jason high-rate waveform data. In addition, the minimum height and backscatter of the iceberg can also be estimated by this method. More than 8000 icebergs were identified between December 2004 and November 2005 in the open water around Antarctica. The annual distribution of icebergs presents a well-defined tripole structure, with maxima near the Antarctic Peninsula, the West Ice Shelf, and the Ross Sea. This distribution is in good agreement with the main trends in Antarctic iceberg motion presented in the scientific literature. The high concentration of icebergs propagating from the Antarctic Peninsula seems to confirm the importance of this region in the discharge of Antarctic ice into the ocean. The results clearly show that altimeter data are a powerful tool in the study of the distribution of small icebergs largely inaccessible by other satellite means. The principle of detection of icebergs by altimeter is quite simple and could be easily applied to the existing archive of all the past and present altimeters (ERS, Topex/Poseidon, Jason, and Envisat) to create a database covering more than 13 years that could improve our knowledge of climate change in Antarctica. |
author2 |
Laboratoire d'Océanographie Spatiale (LOS) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) Laboratoire de physique des océans (LPO) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Tournadre, Jean Whitmer, Kirk Girard-Ardhuin, Fanny |
author_facet |
Tournadre, Jean Whitmer, Kirk Girard-Ardhuin, Fanny |
author_sort |
Tournadre, Jean |
title |
Iceberg detection in open water by altimeter waveform analysis. |
title_short |
Iceberg detection in open water by altimeter waveform analysis. |
title_full |
Iceberg detection in open water by altimeter waveform analysis. |
title_fullStr |
Iceberg detection in open water by altimeter waveform analysis. |
title_full_unstemmed |
Iceberg detection in open water by altimeter waveform analysis. |
title_sort |
iceberg detection in open water by altimeter waveform analysis. |
publisher |
HAL CCSD |
publishDate |
2008 |
url |
https://hal.science/hal-00406208 https://doi.org/10.1029/2007JC004587 |
long_lat |
ENVELOPE(85.000,85.000,-67.000,-67.000) |
geographic |
Antarctic Antarctic Peninsula Ross Sea The Antarctic West Ice Shelf |
geographic_facet |
Antarctic Antarctic Peninsula Ross Sea The Antarctic West Ice Shelf |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Ice Shelf Iceberg* Ross Sea West Ice Shelf |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Ice Shelf Iceberg* Ross Sea West Ice Shelf |
op_source |
ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.science/hal-00406208 Journal of Geophysical Research. Oceans, 2008, 113, pp.C08040. ⟨10.1029/2007JC004587⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2007JC004587 hal-00406208 https://hal.science/hal-00406208 doi:10.1029/2007JC004587 |
op_doi |
https://doi.org/10.1029/2007JC004587 |
container_title |
Journal of Geophysical Research |
container_volume |
113 |
container_issue |
C8 |
_version_ |
1766268054648389632 |