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Surface roughness signatures of summer arctic snow-covered sea ice in X-band dual-polarimetric SAR

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Title
Surface roughness signatures of summer arctic snow-covered sea ice in X-band dual-polarimetric SAR
Other Titles
SAR를 이용한 여름철 북극해 눈덮힌 해빙표면 특성 연구
Authors
Han, Hyangsun
Kim, Jae-In
Hyun, Chang-Uk
Kim, Seung Hee
Park, Jeong-Won
Kwon, Young-Joo
Lee, sungjae
Lee, Sanggyun
Kim, Hyun-cheol
Subject
Physical Geography; Remote Sensing
Keywords
Sea ice surface roughness; root mean square (RMS) height; snow-covered first-year sea ice; synthetic aperture radar (SAR); x-band dual polarimetry
Issue Date
2020-07
Citation
Han, Hyangsun, et al. 2020. "Surface roughness signatures of summer arctic snow-covered sea ice in X-band dual-polarimetric SAR". GISCIENCE & REMOTE SENSING, 57(1): 1-20.
Abstract
Surface roughness of sea ice is primary information for understanding sea ice dynamics and air-ice-ocean interactions. Synthetic aperture radar (SAR) is a powerful tool for investigating sea ice surface roughness owing to the high sensitivity of its signal to surface structures. In this study, we explored the surface roughness signatures of the summer Arctic snow-covered first-year sea ice in X-band dual-polarimetric SAR in terms of the root mean square (RMS) height. Two ice campaigns were conducted for the first-year sea ice with dry snow cover in the marginal ice zone of the Chukchi Sea in August 2017 and August 2018, from which high-resolution (4 cm) digital surface models (DSMs) of the sea ice were derived with the help of a terrestrial laser scanner to obtain the in situ RMS height. X-band dual-polarimetric (HH and VV) SAR data (3 m spatial resolution) were obtained for the 2017 campaign, at a high incidence angle (49.5 degrees) of TerraSAR-X, and for the 2018 campaign, at a mid-incidence angle (36.1 degrees) of TanDEM-X 1-2 days after the acquisition of the DSMs. The sea ice drifted during the time between the SAR and DSM acquisitions. As it is difficult to directly co-register the DSM to SAR owing to the difference in spatial resolution, the two datasets were geometrically matched using unmanned aerial vehicle (4 cm resolution) and helicopter-borne (30 cm resolution) photographs acquired as part of the ice campaigns. A total of five dual-polarimetric SAR features?backscattering coefficients at HH and VV polarizations, co-polarization ratio, co-polarization phase difference, and co-polarization correlation coefficient ?were computed from the dual-polarimetric SAR data and compared to the RMS height of the sea ice, which showed macroscale surface roughness. All the SAR features obtained at the high incidence angle were statistically weakly correlated with the RMS height of the sea ice, possibly influenced by the low backscattering close to the noise level that is attributed to the high incidence angle. The SAR features at the mid-incidence angle showed a statistically significant correlation with the RMS height of the sea ice, with Spearman's correlation coefficient being higher than 0.7, except for the co-polarization ratio. Among the intensity-based and polarimetry-based SAR features, HH-polarized backscattering and co-polarization phase difference were analyzed to be the most sensitive to the macroscale RMS height of the sea ice. Our results show that the X-band dual-polarimetric SAR at mid-incidence angle exhibits potential for estimation of the macroscale surface roughness of the first-year sea ice with dry snow cover in summer.
URI
https://repository.kopri.re.kr/handle/201206/11964
DOI
http://dx.doi.org/10.1080/15481603.2020.1767857
Appears in Collections  
2020-2020, Study on remote sensing for quantitative analysis of changes in the Arctic cryosphere (20-20) / Kim, Hyun-cheol (PE20080)
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