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| Titel |
Estimates of ocean wave heights and attenuation in sea ice using the SAR wave mode on Sentinel-1A |
| VerfasserIn |
Fabrice Ardhuin, Fabrice Collard, Bertrand Chapron, Fanny Girard-Ardhuin, Gilles Guitton, Alexis Mouche, Justin Stopa |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250113996
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| Publikation (Nr.) |
 EGU/EGU2015-14245.pdf |
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| Zusammenfassung |
| Swell evolution from the open ocean into sea ice is poorly understood, in particular the
amplitude attenuation expected from scattering and dissipation. New synthetic aperture radar
(SAR) data from Sentinel-1 wave mode reveal intriguing patterns of bright oscillating lines
shaped like instant noodles. We investigate cases in which the oscillations are in the
azimuth direction, around a straight line in the range direction. This observation is
interpreted as the distortion by the SAR processing of crests from a first swell,
due to the presence of a second swell. As deviations from a straight line should be
proportional to the orbital velocity towards the satellite, swell height can be estimated,
from 1.5 to 5 m in the present case. This evolution of this 13 s period swell across
the ice pack is consistent with an exponential attenuation on a length scale of 200
km. |
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