Signature of Arctic first-year ice melt pond fraction in X-band SAR imagery
Source at https://doi.org/10.5194/tc-11-755-2017 In this paper we investigate the potential of melt pond fraction retrieval from X-band polarimetric synthetic aperture radar (SAR) on drifting first-year sea ice. Melt pond fractions retrieved from a helicopter-borne camera system were compared to pol...
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ftunivtroemsoe:oai:munin.uit.no:10037/11767 2023-05-15T14:23:29+02:00 Signature of Arctic first-year ice melt pond fraction in X-band SAR imagery Fors, Ane Schwenke Divine, Dmitry V Doulgeris, Anthony Paul Renner, Angelika Gerland, Sebastian 2017-03-23 https://hdl.handle.net/10037/11767 https://doi.org/10.5194/tc-11-755-2017 eng eng Copernicus Publications The Cryosphere info:eu-repo/grantAgreement/RCN/ISPNATTEK/239048/NORWAY/Institution based strategic project Mathematics and Statistics at UiT The Arctic University of Norway// Fors AS, Divine D, Doulgeris AP, Renner AHH, Gerland S. Signature of Arctic first-year ice melt pond fraction in X-band SAR imagery. The Cryosphere. 2017;11(2):755-771 FRIDAID 1464907 doi:10.5194/tc-11-755-2017 1994-0416 1994-0424 https://hdl.handle.net/10037/11767 openAccess VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Kvartærgeologi glasiologi: 465 VDP::Mathematics and natural science: 400::Geosciences: 450::Quaternary geology glaciology: 465 Journal article Tidsskriftartikkel Peer reviewed 2017 ftunivtroemsoe https://doi.org/10.5194/tc-11-755-2017 2021-06-25T17:55:29Z Source at https://doi.org/10.5194/tc-11-755-2017 In this paper we investigate the potential of melt pond fraction retrieval from X-band polarimetric synthetic aperture radar (SAR) on drifting first-year sea ice. Melt pond fractions retrieved from a helicopter-borne camera system were compared to polarimetric features extracted from four dual-polarimetric X-band SAR scenes, revealing significant relationships. The correlations were strongly dependent on wind speed and SAR incidence angle. Copolarisation ratio was found to be the most promising SAR feature for melt pond fraction estimation at intermediate wind speeds (6:2ms -1 ), with a Spearman’s correlation coefficient of 0:46. At low wind speeds (0:6ms -1 ), this relation disappeared due to low backscatter from the melt ponds, and backscatter VV-polarisation intensity had the strongest relationship to melt pond fraction with a correlation coefficient of -0:53. To further investigate these relations, regression fits were made both for the intermediate (R 2 fit D 0:21) and low (R 2 fit D 0:26) wind case, and the fits were tested on the satellite scenes in the study. The regression fits gave good estimates of mean melt pond fraction for the full satellite scenes, with less than 4% from a similar statistics derived from analysis of low-altitude imagery captured during helicopter ice-survey flights in the study area. A smoothing window of 51 51 pixels gave the best reproduction of the width of the melt pond fraction distribution. A considerable part of the backscatter signal was below the noise floor at SAR incidence angles above 40 , restricting the information gain from polarimetric features above this threshold. Compared to previous studies in C-band, limitations concerning wind speed and noise floor set stricter constraints on melt pond fraction retrieval in X-band. Despite this, our findings suggest new possibilities in melt pond fraction estimation from X-band SAR, opening for expanded monitoring of melt ponds during melt season in the future. Article in Journal/Newspaper Arctic Arctic Sea ice The Cryosphere University of Tromsø: Munin Open Research Archive Arctic The Cryosphere 11 2 755 771 |
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Open Polar |
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University of Tromsø: Munin Open Research Archive |
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ftunivtroemsoe |
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English |
topic |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Kvartærgeologi glasiologi: 465 VDP::Mathematics and natural science: 400::Geosciences: 450::Quaternary geology glaciology: 465 |
spellingShingle |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Kvartærgeologi glasiologi: 465 VDP::Mathematics and natural science: 400::Geosciences: 450::Quaternary geology glaciology: 465 Fors, Ane Schwenke Divine, Dmitry V Doulgeris, Anthony Paul Renner, Angelika Gerland, Sebastian Signature of Arctic first-year ice melt pond fraction in X-band SAR imagery |
topic_facet |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Kvartærgeologi glasiologi: 465 VDP::Mathematics and natural science: 400::Geosciences: 450::Quaternary geology glaciology: 465 |
description |
Source at https://doi.org/10.5194/tc-11-755-2017 In this paper we investigate the potential of melt pond fraction retrieval from X-band polarimetric synthetic aperture radar (SAR) on drifting first-year sea ice. Melt pond fractions retrieved from a helicopter-borne camera system were compared to polarimetric features extracted from four dual-polarimetric X-band SAR scenes, revealing significant relationships. The correlations were strongly dependent on wind speed and SAR incidence angle. Copolarisation ratio was found to be the most promising SAR feature for melt pond fraction estimation at intermediate wind speeds (6:2ms -1 ), with a Spearman’s correlation coefficient of 0:46. At low wind speeds (0:6ms -1 ), this relation disappeared due to low backscatter from the melt ponds, and backscatter VV-polarisation intensity had the strongest relationship to melt pond fraction with a correlation coefficient of -0:53. To further investigate these relations, regression fits were made both for the intermediate (R 2 fit D 0:21) and low (R 2 fit D 0:26) wind case, and the fits were tested on the satellite scenes in the study. The regression fits gave good estimates of mean melt pond fraction for the full satellite scenes, with less than 4% from a similar statistics derived from analysis of low-altitude imagery captured during helicopter ice-survey flights in the study area. A smoothing window of 51 51 pixels gave the best reproduction of the width of the melt pond fraction distribution. A considerable part of the backscatter signal was below the noise floor at SAR incidence angles above 40 , restricting the information gain from polarimetric features above this threshold. Compared to previous studies in C-band, limitations concerning wind speed and noise floor set stricter constraints on melt pond fraction retrieval in X-band. Despite this, our findings suggest new possibilities in melt pond fraction estimation from X-band SAR, opening for expanded monitoring of melt ponds during melt season in the future. |
format |
Article in Journal/Newspaper |
author |
Fors, Ane Schwenke Divine, Dmitry V Doulgeris, Anthony Paul Renner, Angelika Gerland, Sebastian |
author_facet |
Fors, Ane Schwenke Divine, Dmitry V Doulgeris, Anthony Paul Renner, Angelika Gerland, Sebastian |
author_sort |
Fors, Ane Schwenke |
title |
Signature of Arctic first-year ice melt pond fraction in X-band SAR imagery |
title_short |
Signature of Arctic first-year ice melt pond fraction in X-band SAR imagery |
title_full |
Signature of Arctic first-year ice melt pond fraction in X-band SAR imagery |
title_fullStr |
Signature of Arctic first-year ice melt pond fraction in X-band SAR imagery |
title_full_unstemmed |
Signature of Arctic first-year ice melt pond fraction in X-band SAR imagery |
title_sort |
signature of arctic first-year ice melt pond fraction in x-band sar imagery |
publisher |
Copernicus Publications |
publishDate |
2017 |
url |
https://hdl.handle.net/10037/11767 https://doi.org/10.5194/tc-11-755-2017 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Arctic Sea ice The Cryosphere |
genre_facet |
Arctic Arctic Sea ice The Cryosphere |
op_relation |
The Cryosphere info:eu-repo/grantAgreement/RCN/ISPNATTEK/239048/NORWAY/Institution based strategic project Mathematics and Statistics at UiT The Arctic University of Norway// Fors AS, Divine D, Doulgeris AP, Renner AHH, Gerland S. Signature of Arctic first-year ice melt pond fraction in X-band SAR imagery. The Cryosphere. 2017;11(2):755-771 FRIDAID 1464907 doi:10.5194/tc-11-755-2017 1994-0416 1994-0424 https://hdl.handle.net/10037/11767 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.5194/tc-11-755-2017 |
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The Cryosphere |
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11 |
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2 |
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