Estimates of ocean wave heights and attenuation in sea ice using the SAR wave mode on Sentinel-1A

被引:67
|
作者
Ardhuin, Fabrice [1 ,2 ]
Collard, Fabrice [3 ]
Chapron, Bertrand [1 ]
Girard-Ardhuin, Fanny [1 ]
Guitton, Gilles [3 ]
Mouche, Alexis [1 ]
Stopa, Justin E. [1 ]
机构
[1] IFREMER, Lab Oceanog Spatiale, Brest, France
[2] UBO, IFREMER, Lab Phys Oceans, CNRS,IRD,UMR 6523, Brest, France
[3] OceanDataLab, Plouzane, France
基金
欧盟第七框架计划;
关键词
ocean waves; SAR; sea ice; ZONE; BUOY;
D O I
10.1002/2014GL062940
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
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 5m in the present case. The evolution of this 13s period swell across the ice pack is consistent with an exponential attenuation on a length scale of 200km.
引用
收藏
页码:2317 / 2325
页数:9
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