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| Titel |
A method for sea ice thickness and concentration analysis based on SAR data and a thermodynamic model |
| VerfasserIn |
J. Karvonen, B. Cheng, T. Vihma, M. Arkett, T. Carrieres |
| 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 ; 6, no. 6 ; Nr. 6, no. 6 (2012-12-14), S.1507-1526 |
| Datensatznummer |
250003881
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| Publikation (Nr.) |
 copernicus.org/tc-6-1507-2012.pdf |
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| Zusammenfassung |
| An analysis of ice thickness distribution is a challenge, particularly
in a seasonal sea ice zone with a strongly dynamic ice motion field,
such as the Gulf of St. Lawrence off Canada. We present a novel automated method for
ice concentration and thickness analysis combining modeling of sea
ice thermodynamics and detection of ice motion on the basis of
space-borne Synthetic Aperture Radar (SAR) data. Thermodynamic
evolution of sea ice thickness in the Gulf of St. Lawrence was
simulated for two winters, 2002–2003 and 2008–2009. The basin-scale
ice thickness was controlled by atmospheric forcing, but the spatial
distribution of ice thickness and concentration could not be explained
by thermodynamics only. SAR data were applied to detect ice motion and
ice surface structure during these two winters. The SAR analysis is
based on estimation of ice motion between SAR image pairs and analysis
of the local SAR texture statistics. Including SAR data analysis
brought a significant added value to the results based on
thermodynamics only. Our novel method combining the thermodynamic
modeling and SAR yielded results that well match with the
distribution of observations based on airborne Electromagnetic
Induction (EM) method. Compared to the present operational method of
producing ice charts for the Gulf of St. Lawrence, which is based on
visual interpretation of SAR data, the new method reveals much more
detailed and physically based information on spatial distribution of
ice thickness. The algorithms can be run automatically, and the final
products can then be used by ice analysts for operational ice service.
The method is globally applicable to all seas where SAR data are available. |
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