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| Ardhuin, Fabrice; Boutin, Guillaume; Stopa, Justin; Girard-ardhuin, Fanny; Melsheimer, Christian; Thomson, Jim; Kohout, Alison; Doble, Martin; Wadhams, Peter. |
| Many processes that affect ocean surface gravity waves in sea ice give rise to attenuation rates that vary with both wave frequency and amplitude. Here we particularly test the possible effects of basal friction, scattering by ice floes, and dissipation in the ice layer due to dislocations, and ice breakup by the waves. The possible influence of these processes is evaluated in the marginal ice zone of the Beaufort Sea, where extensive wave measurements were performed. The wave data includes in situ measurements and the first kilometer-scale map of wave heights provided by Sentinel-1 SAR imagery on 12 October 2015, up to 400 km into the ice. We find that viscous friction at the base of an ice layer gives a dissipation rate that may be too large near the ice... |
| Tipo: Text |
Palavras-chave: Wind-waves; Sea ice; WAVEWATCH III; SAR; Beaufort; Arctic. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00462/57372/59439.pdf |
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| Stopa, J. E.; Ardhuin, Fabrice; Thomson, Jim; Smith, Madison M.; Kohout, Alison; Doble, Martin; Wadhams, Peter. |
| A storm with significant wave heights exceeding 4 m occurred in the Beaufort Sea on 11 to 13 October, 2015. The waves and ice were captured on 12 October by the Synthetic Aperture Radar (SAR) on board Sentinel‐1A, with Interferometric Wide swath images covering 400 × 1100 km at 10 m resolution. This dataset allows the estimation of wave spectra across the marginal ice zone (MIZ) every 5 km, over 400 km of sea ice. Since ice attenuates waves with wavelengths shorter than 50 m in a few kilometers, the longer waves are clearly imaged by SAR in sea ice. Obtaining wave spectra from the image requires a careful estimation of the blurring effect produced by unresolved wavelengths in the azimuthal direction. Using in‐situ wave buoy measurements as reference, we... |
| Tipo: Text |
Palavras-chave: Wave-ice interaction; Arctic Ocean marginal ice zone; Sentinel-1A SAR; Arctic Sea State Boundary Layer Physics Program; Remote sensing; Wave attenuation. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00439/55084/56519.pdf |
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