Sensitivity of radar altimeterwaveform to changes in sea ice type at resolution of synthetic aperture radar
Journal article, 2019

Radar altimetry in the context of sea ice has mostly been exploited to retrieve basin-scale information about sea ice thickness. In this paper, we investigate the sensitivity of altimetric waveforms to small-scale changes (a few hundred meters to about 10 km) of the sea ice surface. Near-coincidental synthetic aperture radar (SAR) imagery and CryoSat-2 altimetric data in the Beaufort Sea are used to identify and study the spatial evolution of altimeter waveforms over these features. Open water and thin ice features are easily identified because of their high peak power waveforms. Thicker ice features such as ridges and multiyear ice floes of a few hundred meters cause a response in the waveform. However, these changes are not reflected in freeboard estimates. Retrieval of robust freeboard estimates requires homogeneous floes in the order of 10 km along-track and a few kilometers to both sides across-track. We conclude that the combination of SAR imagery and altimeter data could improve the local sea ice picture by extending spatially scarce freeboard estimates to regions of similar SAR signature.

Sea ice

SAR

Altimetry

Author

Wiebke Aldenhoff

Chalmers, Space, Earth and Environment, Microwave and Optical Remote Sensing

Céline Heuzé

University of Gothenburg

Leif Eriksson

Chalmers, Space, Earth and Environment, Microwave and Optical Remote Sensing

Remote Sensing

2072-4292 (ISSN)

Vol. 11 22 2602

Subject Categories

Physical Geography

Climate Research

Geosciences, Multidisciplinary

DOI

10.3390/rs11222602

More information

Latest update

12/3/2019