Sea‐ice detection from near‐nadir Ku‐band echoes from CFOSAT/SWIM scatterometer
SWIM on board CFOSAT is the first spaceborne, low incidence, rotating scatterometer, aiming at measuring in near-real time ocean waves spectra. With 5 off-nadir beams at incidences between 2° and 10° plus one nadir beam, it covers the Earth in 13 days, including polar regions thanks to its polar orb...
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American Geophysical Union (AGU)
2022
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Online Access: | https://doi.org/10.1029/2021EA002046 https://archimer.ifremer.fr/doc/00745/85673/90814.pdf https://archimer.ifremer.fr/doc/00745/85673/ |
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fttriple:oai:gotriple.eu:10670/1.lxowwe 2023-05-15T18:16:19+02:00 Sea‐ice detection from near‐nadir Ku‐band echoes from CFOSAT/SWIM scatterometer Peureux, Charles Longépé, Nicolas Mouche, Alexis Tison, Céline Tourain, Cédric Lachiver, Jean‐michel Hauser, Danièle 2022-01-01 https://doi.org/10.1029/2021EA002046 https://archimer.ifremer.fr/doc/00745/85673/90814.pdf https://archimer.ifremer.fr/doc/00745/85673/ en eng American Geophysical Union (AGU) doi:10.1029/2021EA002046 10670/1.lxowwe https://archimer.ifremer.fr/doc/00745/85673/90814.pdf https://archimer.ifremer.fr/doc/00745/85673/ other Archimer, archive institutionnelle de l'Ifremer Earth and Space Science (2333-5084) (American Geophysical Union (AGU)) In Press geo envir Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ 2022 fttriple https://doi.org/10.1029/2021EA002046 2023-01-22T18:20:42Z SWIM on board CFOSAT is the first spaceborne, low incidence, rotating scatterometer, aiming at measuring in near-real time ocean waves spectra. With 5 off-nadir beams at incidences between 2° and 10° plus one nadir beam, it covers the Earth in 13 days, including polar regions thanks to its polar orbit. This work aims at exploiting the SWIM data over ice regions with two objectives. An off-nadir data-based sea-ice flag is here proposed that allows, first, to eliminate sea-ice polluted echoes for improving the wave spectrum retrieval, and second, to open perspectives for application of sea-ice monitoring with near nadir Ku-band active sensors. To this end, the signature of both open water and sea-ice radar backscatter is parameterized into Geophysical Model Functions. Then, comparisons with observed profiles through a Bayesian scheme provide a probability of sea-ice presence. After comparison with both model (ECMWF-IFS) and radiometer (SSMI) derived reference data sets, the proposed flag is found to be ready for operational use. At latitudes greater than 40° in absolute value, the proposed flagging algorithm exhibits accuracies of approximately 98% for all beams compared to SSMI data. Beam to beam performances are characterized and show potential for the characterization of sea-ice at Ku band. Text Sea ice Unknown Earth and Space Science 9 6 |
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geo envir Peureux, Charles Longépé, Nicolas Mouche, Alexis Tison, Céline Tourain, Cédric Lachiver, Jean‐michel Hauser, Danièle Sea‐ice detection from near‐nadir Ku‐band echoes from CFOSAT/SWIM scatterometer |
topic_facet |
geo envir |
description |
SWIM on board CFOSAT is the first spaceborne, low incidence, rotating scatterometer, aiming at measuring in near-real time ocean waves spectra. With 5 off-nadir beams at incidences between 2° and 10° plus one nadir beam, it covers the Earth in 13 days, including polar regions thanks to its polar orbit. This work aims at exploiting the SWIM data over ice regions with two objectives. An off-nadir data-based sea-ice flag is here proposed that allows, first, to eliminate sea-ice polluted echoes for improving the wave spectrum retrieval, and second, to open perspectives for application of sea-ice monitoring with near nadir Ku-band active sensors. To this end, the signature of both open water and sea-ice radar backscatter is parameterized into Geophysical Model Functions. Then, comparisons with observed profiles through a Bayesian scheme provide a probability of sea-ice presence. After comparison with both model (ECMWF-IFS) and radiometer (SSMI) derived reference data sets, the proposed flag is found to be ready for operational use. At latitudes greater than 40° in absolute value, the proposed flagging algorithm exhibits accuracies of approximately 98% for all beams compared to SSMI data. Beam to beam performances are characterized and show potential for the characterization of sea-ice at Ku band. |
format |
Text |
author |
Peureux, Charles Longépé, Nicolas Mouche, Alexis Tison, Céline Tourain, Cédric Lachiver, Jean‐michel Hauser, Danièle |
author_facet |
Peureux, Charles Longépé, Nicolas Mouche, Alexis Tison, Céline Tourain, Cédric Lachiver, Jean‐michel Hauser, Danièle |
author_sort |
Peureux, Charles |
title |
Sea‐ice detection from near‐nadir Ku‐band echoes from CFOSAT/SWIM scatterometer |
title_short |
Sea‐ice detection from near‐nadir Ku‐band echoes from CFOSAT/SWIM scatterometer |
title_full |
Sea‐ice detection from near‐nadir Ku‐band echoes from CFOSAT/SWIM scatterometer |
title_fullStr |
Sea‐ice detection from near‐nadir Ku‐band echoes from CFOSAT/SWIM scatterometer |
title_full_unstemmed |
Sea‐ice detection from near‐nadir Ku‐band echoes from CFOSAT/SWIM scatterometer |
title_sort |
sea‐ice detection from near‐nadir ku‐band echoes from cfosat/swim scatterometer |
publisher |
American Geophysical Union (AGU) |
publishDate |
2022 |
url |
https://doi.org/10.1029/2021EA002046 https://archimer.ifremer.fr/doc/00745/85673/90814.pdf https://archimer.ifremer.fr/doc/00745/85673/ |
genre |
Sea ice |
genre_facet |
Sea ice |
op_source |
Archimer, archive institutionnelle de l'Ifremer Earth and Space Science (2333-5084) (American Geophysical Union (AGU)) In Press |
op_relation |
doi:10.1029/2021EA002046 10670/1.lxowwe https://archimer.ifremer.fr/doc/00745/85673/90814.pdf https://archimer.ifremer.fr/doc/00745/85673/ |
op_rights |
other |
op_doi |
https://doi.org/10.1029/2021EA002046 |
container_title |
Earth and Space Science |
container_volume |
9 |
container_issue |
6 |
_version_ |
1766189877974532096 |