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Estimate of the subglacier dielectric constant of an ice shelf using a ground-penetrating step-frequency radar

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4 Author(s)
Hamran, S.-E. ; Div. of Electron., Norwegian Defence Res. Establ., Kjeller, Norway ; Erlingsson, B. ; Gjessing, Y. ; Mo, P.

The mass balance of the Antarctic ice cap, its stability, and the role of the surrounding ice shelf in bottomwater mass formation is, to a large extent, dictated by processes associated with subsurface freezing and melting, where the submerged ice meets the surrounding ocean. It is demonstrated how multifrequency ground-penetrating radar data collected at the Riiser-Larsenisen can be used to examine the physical conditions of the ice-shelf subsurface. The received radar signal from three different frequency intervals, 10-30, 155-170, and 330-360 MHz (range of wavelengths from 15 to 0.5 m in the ice), was analyzed by using a plane reflector model. It is demonstrated that the data can be successfully used to distinguish between types of ice at the ice-ocean interface, such as for freezing marine ice, melting marine ice, melting meteoric ice from the ice cap, and melting firn/ice. The data analysis shows that the subsurface can be regarded as rough on length scales in the order of 1 m

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Geoscience and Remote Sensing, IEEE Transactions on  (Volume:36 ,  Issue: 2 )