Publication on remote sensing of waves in ice

Work package/Task: 

WP4 - Satellite remote sensing of sea ice

This is the first SWARP paper:

Ardhuin Fabrice, Collard Fabrice, Chapron Bertrand, Girard-Ardhuin Fanny, Guitton Gilles, Mouche Alexis, Stopa Justin (2015). Estimates of ocean wave heights and attenuation in sea ice using the SAR wave mode on Sentinel-1A. Geophysical Research Letters, 42(7), 2317-2325.
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.