Estimates of ocean wave heights and attenuation in sea ice using the SAR wave mode on Sentinel-1A
| Type | Article | ||||||||
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| Date | 2015-04 | ||||||||
| Language | English | ||||||||
| Author(s) | Ardhuin Fabrice 1, 2, Collard Fabrice3, Chapron Bertrand1, Girard-Ardhuin Fanny1, Guitton Gilles3, Mouche Alexis1, Stopa Justin1 |
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| Affiliation(s) | 1 : IFREMER, Lab Oceanog Spatiale, Brest, France. 2 : UBO, IFREMER, Lab Phys Oceans, CNRS,IRD,UMR 6523, Brest, France. 3 : OceanDataLab, Plouzane, France. |
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| Source | Geophysical Research Letters (0094-8276) (Amer Geophysical Union), 2015-04 , Vol. 42 , N. 7 , P. 2317-2325 | ||||||||
| DOI | 10.1002/2014GL062940 | ||||||||
| WOS© Times Cited | 47 | ||||||||
| Keyword(s) | ocean waves, SAR, sea ice | ||||||||
| Abstract | 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-1A 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. Since deviations from a straight line should be proportional to the orbital velocity toward the satellite, swell height can be estimated, from 1.5 to 5 m in the present case. The 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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