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| Titel |
Variability of sea ice deformation rates in the Arctic and their relationship with basin-scale wind forcing |
| VerfasserIn |
A. Herman, O. Glowacki |
| 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 (2012-12-20), S.1553-1559 |
| Datensatznummer |
250003884
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| Publikation (Nr.) |
 copernicus.org/tc-6-1553-2012.pdf |
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| Zusammenfassung |
| The temporal variability of the moments of probability distribution functions
(pdfs) of total sea ice deformation rates in the Arctic is analyzed in the
context of the basin-scale wind forcing acting on the ice. The pdfs are
estimated for 594 satellite-derived sea ice deformation maps from 11 winter
seasons between 1996/1997 and 2007/2008, provided by the RADARSAT Geophysical
Processor System. The temporal scale analyzed equals 3 days. The moments of
the pdfs, calculated for a range of spatial scales (12.5–900 km), have two
dominating components of variability: a seasonal cycle, with deformation
rates decreasing throughout winter towards a minimum in March; and a
short-term, synoptic variability, strongly correlated with the area-averaged
magnitude of the wind stress over the Arctic, estimated based on the NCEP-DOE
Reanalysis-2 data (correlation coefficient of 0.71 for the mean deformation
rate). Due to scaling properties of the moments, logarithms of higher moments
are strongly correlated with the wind stress as well. Exceptions are observed
only at small spatial scales, as a result of extreme deformation events, not
directly associated with large-scale wind forcing. By repeating the analysis
within regions of different sizes and locations, we show that the wind–ice
deformation correlation is largest at the basin scale and decreases with
decreasing size of the area of study. Finally, we suggest that a positive
trend in seasonally averaged correlation between sea ice deformation rates
and the wind forcing, present in the analyzed data, may be related to an
observed decrease in the multi-year ice area in the Arctic, indicating
possibly even stronger correlations in the future. |
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