Preprints
https://doi.org/10.5194/tc-2020-116
https://doi.org/10.5194/tc-2020-116
12 May 2020
 | 12 May 2020
Status: this preprint was under review for the journal TC but the revision was not accepted.

Landfast ice growth and displacement in the Mackenzie Delta observed by 3D time-series SAR speckle offset tracking

Byung-Hun Choe, Sergey V. Samsonov, and Jungkyo Jung

Abstract. This study investigates the growth and displacement of landfast ice along the shoreline of the Mackenzie Delta by synthetic aperture radar (SAR) speckle offset tracking (SPO). Three-dimensional (3D) offsets were reconstructed from Sentinel-1 ascending and descending SAR images acquired on the same dates during the November 2017–April 2018 and October 2018–May 2019 annual cycles. The results showed horizontal and vertical displacements of floating landfast ice caused by ice breakups and pressure ridges, which are mainly driven by drift sea ice motions and Mackenzie Delta discharges. Cumulative vertical offsets of approximately −1 to −2 m were observed from freshwater landfast ice, which is due to longer radar penetration into the ice-water interface with increasing landfast ice thickness. Numerical ice thickness model estimates confirmed that the cumulative vertical downward offsets indicate the growth of freshwater landfast ice thickness. Time-series analysis showed that significant growth and displacement of floating landfast ice in the Mackenzie Delta occur between November and January.

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Byung-Hun Choe, Sergey V. Samsonov, and Jungkyo Jung
 
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
Byung-Hun Choe, Sergey V. Samsonov, and Jungkyo Jung
Byung-Hun Choe, Sergey V. Samsonov, and Jungkyo Jung

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Latest update: 13 Jul 2024
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Short summary
This study proposes a methodology to monitor the growth and displacement of landfast ice in the Mackenzie Delta. 3-dimensional speckle offsets were reconstructed with ascending and descending orbit SAR data. Horizontal and vertical displacements caused by landfast ice breakups and pressure ridges were observed. Cumulative vertical offsets of approximately −1 to −2 m were observed, which is due to longer radar penetration into the ice-water interface with increasing landfast ice thickness.