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| Titel |
On producing sea ice deformation data sets from SAR-derived sea ice motion |
| VerfasserIn |
S. Bouillon, P. Rampal |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 9, no. 2 ; Nr. 9, no. 2 (2015-04-09), S.663-673 |
| Datensatznummer |
250116776
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| Publikation (Nr.) |
 copernicus.org/tc-9-663-2015.pdf |
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| Zusammenfassung |
| We propose a method to reduce the error generated when computing sea ice deformation
fields from synthetic aperture radar (SAR)-derived sea ice motion. The method is based on two
steps. The first step consists of using a triangulation of the
positions taken from the sea ice trajectories to define a mesh on
which a first estimate of sea ice deformation is computed. The second
step consists of applying a specific smoother to the deformation field
to reduce the artificial noise that arises along discontinuities in
the sea ice motion field. This method is here applied to RADARSAT Geophysical Processor System (RGPS) sea ice trajectories
having a temporal and spatial resolution of about 3 days
and 10 km, respectively.
From the comparison between unfiltered and
filtered fields, we estimate that the artificial noise causes an
overestimation of about 60% of opening and closing. The
artificial noise also has a strong impact on the statistical
distribution of the deformation and on the scaling exponents estimated
with multifractal analysis. We also show that a similar noise is present in the deformation
fields provided in the widely used four-point deformation RGPS data set.
These findings may have serious
implications for previous studies as the constant overestimation of
the opening and closing could lead to a large overestimation of
freezing in leads, salt rejection and sea ice ridging. |
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