On the relation between polarimetric synthetic aperture radar (SAR) features and sea ice melt pond fraction

Fors, Ane S.; Doulgeris, Anthony P.; Renner, Angelika; Brekke, Camilla; Gerland, Sebastian

doi:10.1109/igarss.2015.7326559

Cited by 3 publications

(4 citation statements)

References 7 publications

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“…Both studies were performed in the central Canadian Arctic Archipelago. The findings were partly confirmed by Fors et al (2015), who also suggest a relationship between f MP and the statistical SAR feature relative kurtosis (RK) utilising Radarsat-2 on iceberg-fast FYI and MYI in the Fram Strait. Han et al (2016) combined multiple polarimetric SAR features in f MP estimation by machine learning methods, employing the co-polarisation channels of the MYI X-band SAR scene explored in Kim et al (2013).…”

Section: Introductionsupporting

confidence: 63%

“…This is also an important result, implying useful knowledge for instance in classification of summer sea ice based on Xband imagery. The statistical feature RK showed a promising relation to f MP in C-band on fast ice in the Fram Strait (Fors et al, 2015), but no relation was found in our investigation. Lack of the HV-channel, or less dominant height difference between ponds and sea ice could both possibly explain the absence of correlation.…”

Section: Discussioncontrasting

confidence: 45%

“…It has a potential in f MP retrieval as it is sensitive to mixtures of surfaces. At C-band, RK was found significantly correlated to f MP over icebergfast sea ice in the Fram Strait (Fors et al, 2015).…”

Section: Polarimetric Sar Featuresmentioning

confidence: 97%

“…Several dual-polarimetric SAR features have been suggested for f MP retrieval from SAR, utilising different expected relations to physical properties of sea ice and melt ponds (Scharien et al, 2012(Scharien et al, , 2014aFors et al, 2015;Han et al, 2016). Eight of these features are included in our study and are described in the following section.…”

Section: Melt Ponds In Sar Imagerymentioning

confidence: 99%

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Signature of Arctic first-year ice melt pond fraction in X-band SAR imagery

et al. 2017

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Abstract. 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 (6.2 m s −1 ), with a Spearman's correlation coefficient of 0.46. At low wind speeds (0.6 m s −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 = 0.21) and low (R 2 fit = 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.

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Section: Introductionsupporting

confidence: 63%

Section: Discussioncontrasting

confidence: 45%

Section: Polarimetric Sar Featuresmentioning

confidence: 97%

Section: Melt Ponds In Sar Imagerymentioning

confidence: 99%

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Signature of Arctic first-year ice melt pond fraction in X-band SAR imagery

et al. 2017

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Late Summer Arctic Sea Ice Surface Roughness Signatures in C-Band SAR Data

Fors

Brekke

Gerland

et al. 2016

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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JC2-1 Joint cruise part 1 2021

Jones

Reigstad²,

Velasco

et al. 2022

NLRS

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The Nansen Legacy Joint Cruise 2, part 1 (JC2-1) 12-29 July 2021, continued the investigation of the interannual variability during the late summer season. At the same time will the cruise provide a late summer reference for the seasonal investigation that was separated to late summer and polar night 2019, and winter and spring 2021. The transect represents an environmental gradient going through the northern Barents Sea, and included 7 process stations (P1-P7) lasting 10-39 hrs. Additional CTD stations (NLEG) were taken between the process stations to increase the hydrographic resolution on the transect. The work started at 76°N at the open Atlantic Water dominated station P1, was sea ice covered from station P4 at 79 45.00 °N and included deep water stations at the P7 station at 82°N in the Nansen Basin. The program included measurements and sampling from the atmosphere, sea ice, ocean and sea floor. Data collected includes several disciplines to map the physical environment, the chemical characterization and biological communities. Key parameters from the Nansen Legacy joint cruises were selected and included in this reduced sampling program, compared to the other joint cruises. An important aim was to characterize the northern Barents Sea to map the interannual variability, but also to see how the proceeding winter and spring conditions has impacted the environment and conditions this year. A third task is to carry out a shelf investigation that can complement the investigations in the deep Arctic Basin starting in late August. Tests and improvements of a modified pelagic trawl (Harstad) were carried out as preparations for the Arctic Basin cruise in late August 2021.

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On the relation between polarimetric synthetic aperture radar (SAR) features and sea ice melt pond fraction

Cited by 3 publications

References 7 publications

Signature of Arctic first-year ice melt pond fraction in X-band SAR imagery

Signature of Arctic first-year ice melt pond fraction in X-band SAR imagery

Late Summer Arctic Sea Ice Surface Roughness Signatures in C-Band SAR Data

JC2-1 Joint cruise part 1 2021

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