FN Archimer Export Format PT J TI Estimates of ocean wave heights and attenuation in sea ice using the SAR wave mode on Sentinel-1A BT AF ARDHUIN, Fabrice COLLARD, Fabrice CHAPRON, Bertrand GIRARD-ARDHUIN, Fanny GUITTON, Gilles MOUCHE, Alexis STOPA, Justin AS 1:1,2;2:3;3:1;4:1;5:3;6:1;7:1; FF 1:;2:;3:PDG-ODE-LOS;4:PDG-ODE-LOS;5:;6:PDG-ODE-LOS;7:PDG-ODE-LOS; C1 IFREMER, Lab Oceanog Spatiale, Brest, France. UBO, IFREMER, Lab Phys Oceans, CNRS,IRD,UMR 6523, Brest, France. OceanDataLab, Plouzane, France. C2 IFREMER, FRANCE CNRS, FRANCE OCEANDATALAB, FRANCE SI BREST SE PDG-ODE-LOS UM LOPS IN WOS Ifremer jusqu'en 2018 copubli-france IF 4.212 TC 50 UR https://archimer.ifremer.fr/doc/00256/36718/35332.pdf LA English DT Article DE ;ocean waves;SAR;sea ice AB 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. PY 2015 PD APR SO Geophysical Research Letters SN 0094-8276 PU Amer Geophysical Union VL 42 IS 7 UT 000353988700032 BP 2317 EP 2325 DI 10.1002/2014GL062940 ID 36718 ER EF