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Sea ice local surface topography from single-pass satellite InSAR measurements: A feasibility study

Permanent link
https://hdl.handle.net/10037/12456
DOI
https://doi.org/10.5194/tc-11-1967-2017
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Date
2017-08-29
Type
Journal article
Tidsskriftartikkel
Peer reviewed

Author
Dierking, Wolfgang Fritz Otto; Lang, Oliver; Busche, Thomas
Abstract
Quantitative parameters characterizing the sea ice surface topography are needed in geophysical investigations such as studies on atmosphere–ice interactions or sea ice mechanics. Recently, the use of space-borne single-pass interferometric synthetic aperture radar (InSAR) for retrieving the ice surface topography has attracted notice among geophysicists. In this paper the potential of InSAR measurements is examined for several satellite configurations and radar frequencies, considering statistics of heights and widths of ice ridges as well as possible magnitudes of ice drift. It is shown that, theoretically, surface height variations can be retrieved with relative errors ≤ 0.5 m. In practice, however, the sea ice drift and open water leads may contribute significantly to the measured interferometric phase. Another essential factor is the dependence of the achievable interferometric baseline on the satellite orbit configurations. Possibilities to assess the influence of different factors on the measurement accuracy are demonstrated: signal-to-noise ratio, presence of a snow layer, and the penetration depth into the ice. Practical examples of sea surface height retrievals from bistatic SAR images collected during the TanDEM-X Science Phase are presented.
Description
Source at: http://doi.org/10.5194/tc-11-1967-2017
Publisher
Copernicus Publications
Citation
Dierking, W. F. O., Lang, O. & Busche, T. (2017). Sea ice local surface topography from single-pass satellite InSAR measurements: A feasibility study. The Cryosphere, 11(4), 1967-1985. http://doi.org/10.5194/tc-11-1967-2017
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